AMD HD7770 strange performance gaps

It seems that a lot of GPU problems revolve around specific versions of drivers. Though AMD has their own support structure, you can often learn from information reported by others who fold.

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AMD HD7770 strange performance gaps

Postby pasaf » Fri Oct 04, 2019 4:36 pm

I'm trying to fold at HD7770 in multiply GPU configuration with NVIDIA (can't get nvidia to work yet).
Driver I'm using is: (17.30.1029 Crimson ReLive Edition Beta for Blockchain Compute)
With latest Adrenalin drivers it fail to start with
Code: Select all
17:07:27:WARNING:WU00:FS01:FahCore returned an unknown error code which probably indicates that it crashed
17:07:27:WARNING:WU00:FS01:FahCore returned: UNKNOWN_ENUM (-1073741701 = 0xc000007b)

Maybe because after NVIDIA driver installation opencl dll was rewritten idk.
Now I have problem with low GPU activity.
Folding power is set to Full. I have 16Gb of RAM and i7-3930k CPU so I don't count that as bottleneck.
Here is the chart:
As you can see GPU Activity is at 64% (450MHz core clock) most of the time. It even drops to 0% sometimes.
At 100% (1150MHz Core clock) it loads only for 1-10 seconds.
With NVIDIA I had stable 100% load.
Posts: 7
Joined: Sat Mar 23, 2019 10:32 pm

Re: AMD HD7770 strange performance gaps

Postby JimboPalmer » Fri Oct 04, 2019 9:47 pm

I have never used two video cards, let alone from different vendors, so I will offer observations while we wait for anyone brave enough to try and smart enough to succeed.

This link can tell you haw to give us enough log to understand your system (typically the first 200 lines)

Whenever you have GPU issues, we try to convince you to download the latest driver direct from the Vendor

How are you measuring low GPU activity? GPU-Z?

i hope this gives you tools to help us diagnose your issue.
Tsar of all the Rushers
I tried to remain childlike, all I achieved was childish.
A friend to those who want no friends
Posts: 1893
Joined: Mon Feb 16, 2009 5:12 am
Location: Greenwood MS USA

Re: AMD HD7770 strange performance gaps

Postby bruce » Fri Oct 04, 2019 11:56 pm

The 0xc000007b error is from Windows, not from FAH. There should be an entry in the Windows error log that tells us more about it. Without any more information, I'm going to guess that it's a driver problem, as JimboPalmer has suggested.

Getting different vendor's driver running concurrently is technicall POSSIBLE but it's actually pretty difficult. I'd recommend you put those two GPUs in separate systems.
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Joined: Thu Nov 29, 2007 11:13 pm
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Re: AMD HD7770 strange performance gaps

Postby pasaf » Sat Oct 05, 2019 7:43 am

I've succeed run both NVIDIA & AMD cards after reinstalling NVIDIA driver (AMD still running on old Crimson driver, don't know if it will on Adrenaline and won't try yet)
Issue with performance gaps still persist. One thing I found out that AMD running @ PCIe x8 1.1 which limits bandwidth to 2gb/s, don't know if this causes issue, though.

Here is the log:
Code: Select all
15:53:37:******************************* System ********************************
15:53:37:            CPU: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz
15:53:37:         CPU ID: GenuineIntel Family 6 Model 45 Stepping 7
15:53:37:           CPUs: 12
15:53:37:         Memory: 15.94GiB
15:53:37:    Free Memory: 13.07GiB
15:53:37:        Threads: WINDOWS_THREADS
15:53:37:     OS Version: 6.2
15:53:37:    Has Battery: false
15:53:37:     On Battery: false
15:53:37:     UTC Offset: 3
15:53:37:            PID: 4776
15:53:37:            CWD: C:\Users\pasaf\AppData\Roaming\FAHClient
15:53:37:             OS: Windows 10 Enterprise LTSC 2019
15:53:37:        OS Arch: AMD64
15:53:37:           GPUs: 2
15:53:37:          GPU 0: Bus:1 Slot:0 Func:0 NVIDIA:3 GK104 [GeForce GTX 670]
15:53:37:          GPU 1: Bus:2 Slot:0 Func:0 AMD:5 R575A [Radeon HD7700 Series]
15:53:37:  CUDA Device 0: Platform:0 Device:0 Bus:1 Slot:0 Compute:3.0 Driver:10.1
15:53:37:OpenCL Device 0: Platform:0 Device:0 Bus:1 Slot:0 Compute:1.2 Driver:436.48
15:53:37:OpenCL Device 1: Platform:1 Device:0 Bus:2 Slot:0 Compute:1.2 Driver:2442.12
15:53:37:  Win32 Service: false
15:53:37:  <!-- Folding Slots -->
15:53:37:Connecting to
15:53:38:Updated GPUs.txt
15:53:38:Read GPUs.txt
15:53:38:Trying to access database...
15:53:38:Successfully acquired database lock
15:53:38:Enabled folding slot 00: PAUSED cpu:9 (not configured)
15:53:38:Enabled folding slot 01: PAUSED gpu:0:GK104 [GeForce GTX 670] (not configured)
15:53:38:Enabled folding slot 02: PAUSED gpu:1:R575A [Radeon R7 250X/HD 7700/8760] (not configured)
15:53:57:Saving configuration to config.xml
15:53:57:  <!-- Network -->
15:53:57:  <proxy v=':8080'/>
15:53:57:  <!-- User Information -->
15:53:57:  <passkey v='********************************'/>
15:53:57:  <team v='235000'/>
15:53:57:  <user v='pasaf'/>
15:53:57:  <!-- Folding Slots -->
15:53:57:  <slot id='0' type='CPU'/>
15:53:57:  <slot id='1' type='GPU'/>
15:53:57:  <slot id='2' type='GPU'/>
15:53:57:Set client configured
15:53:57:WU00:FS00:Connecting to
15:53:57:WU01:FS01:Connecting to
15:53:57:WU02:FS02:Connecting to
15:53:58:WU00:FS00:Connecting to
15:53:58:WU01:FS01:Connecting to
15:53:58:WU00:FS00:Assigned to work server
15:53:58:WU02:FS02:Connecting to
15:53:58:WU00:FS00:Requesting new work unit for slot 00: READY cpu:9 from
15:53:58:WU00:FS00:Connecting to
15:53:58:WU01:FS01:Assigned to work server
15:53:58:WU01:FS01:Requesting new work unit for slot 01: READY gpu:0:GK104 [GeForce GTX 670] from
15:53:58:WU01:FS01:Connecting to
15:53:59:WU02:FS02:Assigned to work server
15:53:59:WU02:FS02:Requesting new work unit for slot 02: READY gpu:1:R575A [Radeon R7 250X/HD 7700/8760] from
15:53:59:WU02:FS02:Connecting to
15:53:59:WU00:FS00:Downloading 8.14MiB
15:54:00:WU01:FS01:Downloading 69.90MiB
15:54:01:WU02:FS02:Downloading 68.65MiB
15:54:02:WU00:FS00:Download complete
15:54:02:WU00:FS00:Received Unit: id:00 state:DOWNLOAD error:NO_ERROR project:13828 run:117 clone:0 gen:8 core:0xa7 unit:0x0000000880fccb095d6580a938479c59
15:54:02:WU00:FS00:Downloading core from
15:54:02:WU00:FS00:Connecting to
15:54:03:WU00:FS00:FahCore a7: Downloading 5.10MiB
15:54:06:WU01:FS01:Download 3.40%
15:54:07:WU02:FS02:Download 8.83%
15:54:08:WU00:FS00:FahCore a7: Download complete
15:54:08:WU00:FS00:Valid core signature
15:54:08:WU00:FS00:Unpacked 15.36MiB to cores/
15:54:08:WU00:FS00:Unpacked 2.07MiB to cores/
15:54:08:WU00:FS00:Unpacked 105.50KiB to cores/
15:54:08:WU00:FS00:Running FahCore: "C:\Program Files (x86)\FAHClient/FAHCoreWrapper.exe" C:\Users\pasaf\AppData\Roaming\FAHClient\cores/ -dir 00 -suffix 01 -version 705 -lifeline 4776 -checkpoint 15 -np 9
15:54:08:WU00:FS00:Started FahCore on PID 2296
15:54:08:WU00:FS00:Core PID:4008
15:54:08:WU00:FS00:FahCore 0xa7 started
15:54:09:WU00:FS00:0xa7:*********************** Log Started 2019-10-04T15:54:09Z ***********************
15:54:09:WU00:FS00:0xa7:************************** Gromacs Folding@home Core ***************************
15:54:09:WU00:FS00:0xa7:       Type: 0xa7
15:54:09:WU00:FS00:0xa7:       Core: Gromacs
15:54:09:WU00:FS00:0xa7:    Website:
15:54:09:WU00:FS00:0xa7:  Copyright: (c) 2009-2018
15:54:09:WU00:FS00:0xa7:     Author: Joseph Coffland <>
15:54:09:WU00:FS00:0xa7:       Args: -dir 00 -suffix 01 -version 705 -lifeline 2296 -checkpoint 15 -np 9
15:54:09:WU00:FS00:0xa7:     Config: <none>
15:54:09:WU00:FS00:0xa7:************************************ Build *************************************
15:54:09:WU00:FS00:0xa7:    Version: 0.0.17
15:54:09:WU00:FS00:0xa7:       Date: Apr 25 2018
15:54:09:WU00:FS00:0xa7:       Time: 11:02:26
15:54:09:WU00:FS00:0xa7: Repository: Git
15:54:09:WU00:FS00:0xa7:   Revision: fd11abfb405c921e66db1226933e9dd2d18d2acc
15:54:09:WU00:FS00:0xa7:     Branch: master
15:54:09:WU00:FS00:0xa7:   Compiler: Visual C++ 2008
15:54:09:WU00:FS00:0xa7:    Options: /TP /nologo /EHa /wd4297 /wd4103 /Ox /MT
15:54:09:WU00:FS00:0xa7:   Platform: win32 10
15:54:09:WU00:FS00:0xa7:       Bits: 32
15:54:09:WU00:FS00:0xa7:       Mode: Release
15:54:09:WU00:FS00:0xa7:       SIMD: sse2
15:54:09:WU00:FS00:0xa7:************************************ System ************************************
15:54:09:WU00:FS00:0xa7:        CPU: Unknown
15:54:09:WU00:FS00:0xa7:     CPU ID:
15:54:09:WU00:FS00:0xa7:       CPUs: 12
15:54:09:WU00:FS00:0xa7:     Memory: 15.94GiB
15:54:09:WU00:FS00:0xa7:Free Memory: 12.97GiB
15:54:09:WU00:FS00:0xa7:    Threads: WINDOWS_THREADS
15:54:09:WU00:FS00:0xa7: OS Version: 6.2
15:54:09:WU00:FS00:0xa7:Has Battery: false
15:54:09:WU00:FS00:0xa7: On Battery: false
15:54:09:WU00:FS00:0xa7: UTC Offset: 3
15:54:09:WU00:FS00:0xa7:        PID: 4008
15:54:09:WU00:FS00:0xa7:        CWD: C:\Users\pasaf\AppData\Roaming\FAHClient\work
15:54:09:WU00:FS00:0xa7:         OS: Windows 10 Enterprise LTSC 2019
15:54:09:WU00:FS00:0xa7:    OS Arch: AMD64
15:54:09:WU00:FS00:0xa7:Project: 13828 (Run 117, Clone 0, Gen 8)
15:54:09:WU00:FS00:0xa7:Unit: 0x0000000880fccb095d6580a938479c59
15:54:09:WU00:FS00:0xa7:Reading tar file core.xml
15:54:09:WU00:FS00:0xa7:Reading tar file frame8.tpr
15:54:09:WU00:FS00:0xa7:Digital signatures verified
15:54:09:WU00:FS00:0xa7:Calling: mdrun -s frame8.tpr -o frame8.trr -x frame8.xtc -cpt 15 -nt 9
15:54:11:WU00:FS00:0xa7:Steps: first=1000000 total=125000
15:54:12:WU01:FS01:Download 6.97%
15:54:13:WU02:FS02:Download 16.84%
15:54:18:WU01:FS01:Download 24.59%
15:54:19:WU02:FS02:Download 38.15%
15:54:19:WU00:FS00:0xa7:Completed 1 out of 125000 steps (0%)
15:54:24:WU01:FS01:Download 46.41%
15:54:25:WU02:FS02:Download 54.99%
15:54:30:WU01:FS01:Download 63.22%
15:54:31:WU02:FS02:Download 73.02%
15:54:36:WU01:FS01:Download 78.42%
15:54:37:WU02:FS02:Download 89.22%
15:54:39:Saving configuration to config.xml
15:54:39:  <!-- Network -->
15:54:39:  <proxy v=':8080'/>
15:54:39:  <!-- User Information -->
15:54:39:  <passkey v='********************************'/>
15:54:39:  <team v='235000'/>
15:54:39:  <user v='pasaf'/>
15:54:39:  <!-- Folding Slots -->
15:54:39:  <slot id='0' type='CPU'/>
15:54:39:  <slot id='1' type='GPU'/>
15:54:39:  <slot id='2' type='GPU'/>
15:54:39:WU02:FS02:Download complete
15:54:39:WU02:FS02:Received Unit: id:02 state:DOWNLOAD error:NO_ERROR project:14228 run:88 clone:0 gen:50 core:0x21 unit:0x0000004180fccb0a5d6553d839b97985
15:54:39:WU02:FS02:Downloading core from
15:54:39:WU02:FS02:Connecting to
15:54:40:WU01:FS01:Download complete
15:54:40:WU02:FS02:FahCore 21: Downloading 3.48MiB
15:54:41:WU01:FS01:Received Unit: id:01 state:DOWNLOAD error:NO_ERROR project:14250 run:384 clone:0 gen:62 core:0x21 unit:0x0000005580fccb0a5d6ed218f647c969
15:54:41:WU01:FS01:Downloading core from
15:54:41:WU01:FS01:Connecting to
15:54:41:WU01:FS01:FahCore 21: Downloading 3.47MiB
15:54:43:WU02:FS02:FahCore 21: Download complete
15:54:44:WU02:FS02:Valid core signature
15:54:44:WU02:FS02:Unpacked 11.81MiB to cores/
15:54:44:WU02:FS02:Running FahCore: "C:\Program Files (x86)\FAHClient/FAHCoreWrapper.exe" C:\Users\pasaf\AppData\Roaming\FAHClient\cores/ -dir 02 -suffix 01 -version 705 -lifeline 4776 -checkpoint 15 -gpu-vendor amd -opencl-platform 1 -opencl-device 0 -gpu 0
15:54:44:WU02:FS02:Started FahCore on PID 3964
15:54:44:WU02:FS02:Core PID:1664
15:54:44:WU02:FS02:FahCore 0x21 started
15:54:44:WU02:FS02:0x21:*********************** Log Started 2019-10-04T15:54:44Z ***********************
15:54:44:WU02:FS02:0x21:Project: 14228 (Run 88, Clone 0, Gen 50)
15:54:44:WU02:FS02:0x21:Unit: 0x0000004180fccb0a5d6553d839b97985
15:54:44:WU02:FS02:0x21:CPU: 0x00000000000000000000000000000000
15:54:44:WU02:FS02:0x21:Machine: 2
15:54:44:WU02:FS02:0x21:Reading tar file core.xml
15:54:44:WU02:FS02:0x21:Reading tar file integrator.xml
15:54:44:WU02:FS02:0x21:Reading tar file state.xml
15:54:44:WU02:FS02:0x21:Reading tar file system.xml
15:54:44:WU01:FS01:FahCore 21: Download complete
15:54:45:WU01:FS01:Valid core signature
15:54:45:WU01:FS01:Unpacked 11.80MiB to cores/
15:54:45:WU01:FS01:Running FahCore: "C:\Program Files (x86)\FAHClient/FAHCoreWrapper.exe" C:\Users\pasaf\AppData\Roaming\FAHClient\cores/ -dir 01 -suffix 01 -version 705 -lifeline 4776 -checkpoint 15 -gpu-vendor nvidia -opencl-platform 0 -opencl-device 0 -cuda-device 0 -gpu 0
15:54:45:WU01:FS01:Started FahCore on PID 4000
15:54:45:WU01:FS01:Core PID:1444
15:54:45:WU01:FS01:FahCore 0x21 started
15:54:45:WU02:FS02:0x21:Digital signatures verified
15:54:45:WU02:FS02:0x21:Folding@home GPU Core21 Folding@home Core
15:54:45:WU02:FS02:0x21:Version 0.0.20
15:54:45:WU01:FS01:0x21:*********************** Log Started 2019-10-04T15:54:45Z ***********************
15:54:45:WU01:FS01:0x21:Project: 14250 (Run 384, Clone 0, Gen 62)
15:54:45:WU01:FS01:0x21:Unit: 0x0000005580fccb0a5d6ed218f647c969
15:54:45:WU01:FS01:0x21:CPU: 0x00000000000000000000000000000000
15:54:45:WU01:FS01:0x21:Machine: 1
15:54:45:WU01:FS01:0x21:Reading tar file core.xml
15:54:45:WU01:FS01:0x21:Reading tar file integrator.xml
15:54:45:WU01:FS01:0x21:Reading tar file state.xml
15:54:45:WU01:FS01:0x21:Reading tar file system.xml
15:54:46:WU01:FS01:0x21:Digital signatures verified
15:54:46:WU01:FS01:0x21:Folding@home GPU Core21 Folding@home Core
15:54:46:WU01:FS01:0x21:Version 0.0.20
15:55:05:FS00:Shutting core down
15:55:05:WU00:FS00:0xa7:WARNING:Console control signal 1 on PID 4008
15:55:05:WU00:FS00:0xa7:Exiting, please wait. . .
15:55:10:WU00:FS00:0xa7:Folding@home Core Shutdown: INTERRUPTED
15:55:10:WU00:FS00:FahCore returned: INTERRUPTED (102 = 0x66)
15:55:11:WARNING:WU00:FS00:Changed SMP threads from 9 to 10 this can cause some work units to fail
15:55:11:WARNING:WU00:FS00:AS lowered CPUs from 10 to 9
15:55:11:WU00:FS00:Running FahCore: "C:\Program Files (x86)\FAHClient/FAHCoreWrapper.exe" C:\Users\pasaf\AppData\Roaming\FAHClient\cores/ -dir 00 -suffix 01 -version 705 -lifeline 4776 -checkpoint 15 -np 9
15:55:11:WU00:FS00:Started FahCore on PID 7136
15:55:11:WU00:FS00:Core PID:6360
15:55:11:WU00:FS00:FahCore 0xa7 started
15:55:11:WU00:FS00:0xa7:*********************** Log Started 2019-10-04T15:55:11Z ***********************
15:55:11:WU00:FS00:0xa7:************************** Gromacs Folding@home Core ***************************
15:55:11:WU00:FS00:0xa7:       Type: 0xa7
15:55:11:WU00:FS00:0xa7:       Core: Gromacs
15:55:11:WU00:FS00:0xa7:    Website:
15:55:11:WU00:FS00:0xa7:  Copyright: (c) 2009-2018
15:55:11:WU00:FS00:0xa7:     Author: Joseph Coffland <>
15:55:11:WU00:FS00:0xa7:       Args: -dir 00 -suffix 01 -version 705 -lifeline 7136 -checkpoint 15 -np 9
15:55:11:WU00:FS00:0xa7:     Config: <none>
15:55:11:WU00:FS00:0xa7:************************************ Build *************************************
15:55:11:WU00:FS00:0xa7:    Version: 0.0.17
15:55:11:WU00:FS00:0xa7:       Date: Apr 25 2018
15:55:11:WU00:FS00:0xa7:       Time: 11:02:26
15:55:11:WU00:FS00:0xa7: Repository: Git
15:55:11:WU00:FS00:0xa7:   Revision: fd11abfb405c921e66db1226933e9dd2d18d2acc
15:55:11:WU00:FS00:0xa7:     Branch: master
15:55:11:WU00:FS00:0xa7:   Compiler: Visual C++ 2008
15:55:11:WU00:FS00:0xa7:    Options: /TP /nologo /EHa /wd4297 /wd4103 /Ox /MT
15:55:11:WU00:FS00:0xa7:   Platform: win32 10
15:55:11:WU00:FS00:0xa7:       Bits: 32
15:55:11:WU00:FS00:0xa7:       Mode: Release
15:55:11:WU00:FS00:0xa7:       SIMD: sse2
15:55:11:WU00:FS00:0xa7:************************************ System ************************************
15:55:11:WU00:FS00:0xa7:        CPU: Unknown
15:55:11:WU00:FS00:0xa7:     CPU ID:
15:55:11:WU00:FS00:0xa7:       CPUs: 12
15:55:11:WU00:FS00:0xa7:     Memory: 15.94GiB
15:55:11:WU00:FS00:0xa7:Free Memory: 12.89GiB
15:55:11:WU00:FS00:0xa7:    Threads: WINDOWS_THREADS
15:55:11:WU00:FS00:0xa7: OS Version: 6.2
15:55:11:WU00:FS00:0xa7:Has Battery: false
15:55:11:WU00:FS00:0xa7: On Battery: false
15:55:11:WU00:FS00:0xa7: UTC Offset: 3
15:55:11:WU00:FS00:0xa7:        PID: 6360
15:55:11:WU00:FS00:0xa7:        CWD: C:\Users\pasaf\AppData\Roaming\FAHClient\work
15:55:11:WU00:FS00:0xa7:         OS: Windows 10 Enterprise LTSC 2019
15:55:11:WU00:FS00:0xa7:    OS Arch: AMD64
15:55:11:WU00:FS00:0xa7:Project: 13828 (Run 117, Clone 0, Gen 8)
15:55:11:WU00:FS00:0xa7:Unit: 0x0000000880fccb095d6580a938479c59
15:55:11:WU00:FS00:0xa7:Digital signatures verified
15:55:11:WU00:FS00:0xa7:Calling: mdrun -s frame8.tpr -o frame8.trr -x frame8.xtc -cpi state.cpt -cpt 15 -nt 9
15:55:12:WU00:FS00:0xa7:Steps: first=1000000 total=125000
15:55:18:WU00:FS00:0xa7:Completed 412 out of 125000 steps (0%)
15:55:19:WU02:FS02:0x21:Completed 0 out of 2000000 steps (0%)
15:55:19:WU02:FS02:0x21:Temperature control disabled. Requirements: single Nvidia GPU, tmax must be < 110 and twait >= 900
15:55:23:WU01:FS01:0x21:Completed 0 out of 1000000 steps (0%)
15:55:23:WU01:FS01:0x21:Temperature control disabled. Requirements: single Nvidia GPU, tmax must be < 110 and twait >= 900
15:55:40:Saving configuration to config.xml
15:55:40:  <!-- Network -->
15:55:40:  <proxy v=':8080'/>
15:55:40:  <!-- Slot Control -->
15:55:40:  <power v='full'/>
15:55:40:  <!-- User Information -->
15:55:40:  <passkey v='********************************'/>
15:55:40:  <team v='235000'/>
15:55:40:  <user v='pasaf'/>
15:55:40:  <!-- Folding Slots -->
15:55:40:  <slot id='0' type='CPU'/>
15:55:40:  <slot id='1' type='GPU'/>
15:55:40:  <slot id='2' type='GPU'/>
15:56:54:WU00:FS00:0xa7:Completed 1250 out of 125000 steps (1%)
15:59:14:WU00:FS00:0xa7:Completed 2500 out of 125000 steps (2%)
15:59:30:Saving configuration to config.xml
15:59:30:  <!-- Folding Core -->
15:59:30:  <core-priority v='low'/>
15:59:30:  <!-- Network -->
15:59:30:  <proxy v=':8080'/>
15:59:30:  <!-- Slot Control -->
15:59:30:  <pause-on-battery v='false'/>
15:59:30:  <power v='full'/>
15:59:30:  <!-- User Information -->
15:59:30:  <passkey v='********************************'/>
15:59:30:  <team v='235000'/>
15:59:30:  <user v='pasaf'/>
15:59:30:  <!-- Folding Slots -->
15:59:30:  <slot id='0' type='CPU'/>
15:59:30:  <slot id='1' type='GPU'/>
15:59:30:  <slot id='2' type='GPU'/>
15:59:44:Saving configuration to config.xml
15:59:44:  <!-- Folding Core -->
15:59:44:  <core-priority v='low'/>
15:59:44:  <!-- Network -->
15:59:44:  <proxy v=':8080'/>
15:59:44:  <!-- Slot Control -->
15:59:44:  <pause-on-battery v='false'/>
15:59:44:  <power v='full'/>
15:59:44:  <!-- User Information -->
15:59:44:  <passkey v='********************************'/>
15:59:44:  <team v='235000'/>
15:59:44:  <user v='pasaf'/>
15:59:44:  <!-- Folding Slots -->
15:59:44:  <slot id='0' type='CPU'/>
15:59:44:  <slot id='1' type='GPU'/>
15:59:44:  <slot id='2' type='GPU'/>
Posts: 7
Joined: Sat Mar 23, 2019 10:32 pm

Re: AMD HD7770 strange performance gaps

Postby foldy » Sat Oct 05, 2019 11:52 am

Can you check pcie speed with GPU-Z while FAH is running? You CPU supports pcie 2.0 and with 40 lanes should be able to run 2 GPUs at pcie 2.0 x16. Maybe the mainboard has some limits there?

Also you can try to pause the CPU slot to see if that makes any difference for your GPU?

Another AMD driver may also be worth trying. FAH cannot use any mining optimizations done in AMD blockchain driver for VRAM.
Posts: 1925
Joined: Sat Dec 01, 2012 4:43 pm

Re: AMD HD7770 strange performance gaps

Postby pasaf » Sun Oct 06, 2019 8:30 pm

Well, yes, it switches to x8 3.0 when folding is active Image
I will try Adrenaline drivers if I able to run them (see error in my first message)
Posts: 7
Joined: Sat Mar 23, 2019 10:32 pm

Re: AMD HD7770 strange performance gaps

Postby pasaf » Mon Oct 07, 2019 9:54 am

After using DDU in safe mode for both cards, installed latest drivers (AMD first), reinstalled FAHClient and both cards working. AMD still has those gaps but working on 1150MHz while on 64% load and strangely reduces clock to 400Mhz when on 100% load (maybe driver has revert reporting but I'm using latest with clean install).
NVIDIA is used as main GPU (installed in first pcie slot and display is connected to it)
Posts: 7
Joined: Sat Mar 23, 2019 10:32 pm

Re: AMD HD7770 strange performance gaps

Postby ViTe » Mon Nov 18, 2019 12:26 am

Try to check CPU load with Windows 10 task manager, especially "kernell time". If you dont run FAH on CPU but still have high CPU load with high level kernell time (30-50%) than you have a technical issue with 2 cards in the system.
Posts: 7
Joined: Tue Feb 14, 2012 3:22 am

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