7640 & 7643 PPD

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bollix47
Posts: 2941
Joined: Sun Dec 02, 2007 5:04 am
Location: Canada

Re: 7640 & 7643 PPD

Post by bollix47 »

FWIW

My 560 Ti current setup:

core 830 Ghz
shader 1660
memory 2004
fan 65%

No problems with these WUs except their PPD is about 30% lower than the 80xx projects.
apeman556
Posts: 15
Joined: Fri Aug 22, 2008 12:37 pm

Re: 7640 & 7643 PPD

Post by apeman556 »

Hello, Tried the gpu at the recommended clocks last night but unfortunatley it still failed to finish a 7640 WU, again it said 'mdrun_gpu returned 52' 'NANs detected on GPU', it did however complete 8036 wu, as it always does, it only ever fails on the 7640 WU. Its not an overheating problem as I've changed the stock cooler for an Artic pro cooler and the temp only ever reaches 69 when overclocked, runs at about 50 degrees at stock speed. Any other suggestions, it does seem like that the problem is with the work unit 7640, it's the only unit that fails to finish.
P5-133XL
Posts: 2948
Joined: Sun Dec 02, 2007 4:36 am
Hardware configuration: Machine #1:

Intel Q9450; 2x2GB=8GB Ram; Gigabyte GA-X48-DS4 Motherboard; PC Power and Cooling Q750 PS; 2x GTX 460; Windows Server 2008 X64 (SP1).

Machine #2:

Intel Q6600; 2x2GB=4GB Ram; Gigabyte GA-X48-DS4 Motherboard; PC Power and Cooling Q750 PS; 2x GTX 460 video card; Windows 7 X64.

Machine 3:

Dell Dimension 8400, 3.2GHz P4 4x512GB Ram, Video card GTX 460, Windows 7 X32

I am currently folding just on the 5x GTX 460's for aprox. 70K PPD
Location: Salem. OR USA

Re: 7640 & 7643 PPD

Post by P5-133XL »

When you change coolers, you have to make sure the VRM's and/or the RAM get heat sinks too. The stock cooler had a plenum (cover) that directed air over them which gets removed when adding the replacement cooler. If you don't cool them independently it is possible to overheat the VRM's or even the RAM to the point of failure while the GPU is still plenty cool. There are no temp sensors for VRM's...
Image
apeman556
Posts: 15
Joined: Fri Aug 22, 2008 12:37 pm

Re: 7640 & 7643 PPD

Post by apeman556 »

hello, yes, the artic cooler came with plenty of heatsinks which I've stuck over all the vrm's and memory chips, there is also plenty of air going through the case, 3 intake fans and 3 exhaust fans, cooling is not an issue. Since my last post, the GPU has successfully completed an 8019, 2 x 8006, an 8007 and a 8010 WU's with no problem. It just seems to be the 7640 units that fail. Any other ideas or suggestions, I'm at a loss.
7im
Posts: 10189
Joined: Thu Nov 29, 2007 4:30 pm
Hardware configuration: Intel i7-4770K @ 4.5 GHz, 16 GB DDR3-2133 Corsair Vengence (black/red), EVGA GTX 760 @ 1200 MHz, on an Asus Maximus VI Hero MB (black/red), in a blacked out Antec P280 Tower, with a Xigmatek Night Hawk (black) HSF, Seasonic 760w Platinum (black case, sleeves, wires), 4 SilenX 120mm Case fans with silicon fan gaskets and silicon mounts (all black), a 512GB Samsung SSD (black), and a 2TB Black Western Digital HD (silver/black).
Location: Arizona
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Re: 7640 & 7643 PPD

Post by 7im »

764x wus are much larger and are known to push GPUs much harder than any other work units. When people have to down clock to run these, we know the WU is chewy.

Have you run memtest on that card?
How to provide enough information to get helpful support
Tell me and I forget. Teach me and I remember. Involve me and I learn.
apeman556
Posts: 15
Joined: Fri Aug 22, 2008 12:37 pm

Re: 7640 & 7643 PPD

Post by apeman556 »

Hi, yes ran memtestg80 for well over 4 hours using 850MB of ram,(the most it would let me do), no errors found. When runningthe 7640 WU's, my GPU was only running at 92%. Is this normal, could that be why it keeps failing on these?
7im
Posts: 10189
Joined: Thu Nov 29, 2007 4:30 pm
Hardware configuration: Intel i7-4770K @ 4.5 GHz, 16 GB DDR3-2133 Corsair Vengence (black/red), EVGA GTX 760 @ 1200 MHz, on an Asus Maximus VI Hero MB (black/red), in a blacked out Antec P280 Tower, with a Xigmatek Night Hawk (black) HSF, Seasonic 760w Platinum (black case, sleeves, wires), 4 SilenX 120mm Case fans with silicon fan gaskets and silicon mounts (all black), a 512GB Samsung SSD (black), and a 2TB Black Western Digital HD (silver/black).
Location: Arizona
Contact:

Re: 7640 & 7643 PPD

Post by 7im »

Read back through the thread. Running at less that 100% on these WUs is normal. However, failing on these WUs when running stock GPU speeds is not normal, unless you have one of those Factory Overclocked cards. You may have to underclock the card to make it stable.
How to provide enough information to get helpful support
Tell me and I forget. Teach me and I remember. Involve me and I learn.
apeman556
Posts: 15
Joined: Fri Aug 22, 2008 12:37 pm

Re: 7640 & 7643 PPD

Post by apeman556 »

My card came factory overclocked to 900MHz, I tried reducing the clock speed to the recommended speed of 822, but to still fails to finish these 7640 WU's. I've ram memtest and every other gpu, graphic card stress tester I could find and it always passes. Any other ideas, reasons you can think of? Currently I seem to be getting the 8000 WU'd which are no problem, even at the standard overclock of 900.
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