GTX960 + GTX285

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Ricorocks
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GTX960 + GTX285

Post by Ricorocks »

Hi guys,
Mb P6T SE, I7950 it has 3 pcie 2,0 x16 (at 16/x 16/x 4 mode) assuming enough space to put them. Both cards are EVGA GTX960 GTX285, can these be happy together? F@H dedicated machine with no monitor.

GTX 285 was replaced by the GTX960, now toying with putting GTX285 back to work.

With the 960 I had to use the supplied 2 6pin goes to 1 8pin.

Can I get a connector cable which has connects to 2 6pin female & the other end 1 8 pin (to the 960) which also has two 6 pin (to the 2850? psu 750w
Joe_H
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Re: GTX960 + GTX285

Post by Joe_H »

Your GTX 285 is too old for folding at this point, the last projects that could use it ran out several months ago. If this was not a dedicated machine, then the GTX 285 could be used to drive a display and leave the other GTX 960 GPU to run folding full time.
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Ricorocks
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Re: GTX960 + GTX285

Post by Ricorocks »

Thanks Joe, no the machine with the 960 is not using a monitor. But If I bought say another GTX960, I would need a connector (power), 2 6pin one end & 2 8 pin. Would that work & where would I look Fry's or where.
rwh202
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Re: GTX960 + GTX285

Post by rwh202 »

Ricorocks wrote:Thanks Joe, no the machine with the 960 is not using a monitor. But If I bought say another GTX960, I would need a connector (power), 2 6pin one end & 2 8 pin. Would that work & where would I look Fry's or where.
It's unusual for a 750W power supply to only have 2 6-pin connectors, but you can get single 6-pin to 8-pin converters - my gtx 960s came with them if I remember correctly. (The power requirements of a 960 mean that a 6-pin will happily work, but 8-pin are used for marketing and overclocking prowess)

The adapters are available from my usual UK supplier: https://www.scan.co.uk/products/akasa-a ... le-adapter so I'd imagine you'd find them elsewhere too. Failing that, molex/sata to 6- or 8-pin are very common.

Hope that helps.
ChristianVirtual
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Re: GTX960 + GTX285

Post by ChristianVirtual »

rwh202 wrote: Failing that, molex/sata to 6- or 8-pin are very common.
is that electrically safe ? I remember to have read stories about melted connectors as the current was too high for the spec of the Molex/Sata cables. There are some serious Ampere floating between PSU and GPU. I would go as direct as possible from cabling point of view and avoid "creative" physical conversion.
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foldy
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Re: GTX960 + GTX285

Post by foldy »

No nothing is melting :-) It could only be the power supply cannot provide the needed power over the 6 pin connector in which case the PC will shutdown.
But it is a 750W power supply and the gtx 960 needs 100W so I it can handle 2 cards easily.

If you buy more GPUs I would still recommend the newer generation gtx 1060.
It has more than double the folding performance for only 80 dollar more without using more power.

GTX 960 folds 150k PPD at 100W for $150
GTX 1060 folds 350k PPD at 100W for $235
e.g. http://www.newegg.com/Product/Product.a ... -_-Product
This is the 3GB memory version which could even get more cheap down to 200 dollar.
Last edited by foldy on Sun Aug 21, 2016 8:46 am, edited 2 times in total.
rwh202
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Re: GTX960 + GTX285

Post by rwh202 »

ChristianVirtual wrote:
rwh202 wrote: Failing that, molex/sata to 6- or 8-pin are very common.
is that electrically safe ? I remember to have read stories about melted connectors as the current was too high for the spec of the Molex/Sata cables. There are some serious Ampere floating between PSU and GPU. I would go as direct as possible from cabling point of view and avoid "creative" physical conversion.
I agree, direct is best, but they 'should' be fine, especially for lower power GPUs. A single molex will provide around 10 Amps, sata - 4.5 Amps at 12 V. You usually use a pair going to a single 75W 6-pin connector (6ish Amps) The issue comes when you use 4 molex connectors from the same strand and try to power a pair of 380's! The cabling is shared (and has a join in each molex) so will probably get a little toasty! The other problem is that molex pins are bit flaky and can easily get bent and distorted so you don't get proper contact.
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Re: GTX960 + GTX285

Post by Nathan_P »

foldy wrote:No nothing is melting :-) It could only be the power supply cannot provide the needed power over the 6 pin connector in which case the PC will shutdown.
But it is a 750W power supply and the gtx 960 needs 100W so I it can handle 2 cards easily.

If you buy more GPUs I would still recommend the newer generation gtx 1060.
It has more than double the folding performance for only 80 dollar more without using more power.

GTX 960 folds 150k PPD at 100W for $150
GTX 1060 folds 350k PPD at 100W for $235
e.g. http://www.newegg.com/Product/Product.a ... -_-Product
This is the 3GB memory version which could even get more cheap down to 200 dollar.
Just because the psu sticker says its 750watts, it does not mean that the psu can actually deliver 750w and not all psu's shut down gracefully when overloaded - some just go bang.

Ricorocks - before you spend any more on gpu's what is the make and model of the psu you are using - I've used decent adapters on top of the line pus's and have meltdowns so I wouldn't go anywhere near one. Crap psu's run the risk of trashing hardware.
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foldy
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Re: GTX960 + GTX285

Post by foldy »

He does not need 750w but only max 120w per 6 pin plug which is 10A*12v. I'm very sure the power supply can deliver that.
But you are right better get the details of power supply.
Ricorocks
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Re: GTX960 + GTX285

Post by Ricorocks »

Good Morning Guys,

PSU - 750W Corsair CMPSU-750TX-Quad SLI Ready. No doubt the 'TX' is for Texas. What was used from the box 960 came in: 2x female 6pin on end, the other 1 8pin female to 960.

So for the 2nd (future gpu), one more "Y" splitter. 1x 8 pin male the other end 2x 8 pin female. Correct? The 1060 does it use 1 8pin.

Currently (folding like crazy) - cpu 68-69C, mb 46C, gpu 71C, outside air force fed in by fan 78F. Do you think that would raise the temps too high? For fans pushing air into the case, do you filter & if so what do you use.

Where the rig sits now it's pretty much getting OSA (blown in), 77 - 80F, I could move the whole shebang into a closet that, stay constant 74F.
foldy
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Re: GTX960 + GTX285

Post by foldy »

Good power supply upto 60A on 12V using single rail.
Is this your power supply? http://images.bit-tech.net/content_imag ... 50w3-8.jpg
Then it should have 4 pcie plugs and you can add the 2 pin next to the 6 pin plug and make it a 8 pin plug without Y splitters.
Ricorocks
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Re: GTX960 + GTX285

Post by Ricorocks »

Yes that looks like it 750 with orange/blk label. From that spaghetti monster, so the four which are labeled, 'pcie', so theyt can be used as a 6 or 8pin.

What about the additional heat from the 2nd gpu, would that be nominal or crazy hotter?
Nathan_P
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Re: GTX960 + GTX285

Post by Nathan_P »

Nothing wrong with a 750tx, you should have all the cables you need and they should all be labelled PCIe, if you have to use an adapter use a 2x6 pin to 1x 8pin and make sure its plugged in tight, loose cables will eventually lead to burnt out pins. As for 1060's some use 2 6 pin and some use 1 8 pin, you'll have to check the model that you purchase for which it has.

GPU temps will be a matter of how close the cards are, how cool the space around them is and how quickly you can shift warm air away from them.
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Ricorocks
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Re: GTX960 + GTX285

Post by Ricorocks »

OK! My case seems to have one exhaust fan rear top. The fan in use is a RAIDMAX. I believe 120mm. Which fans move the most air (CFM), that I should consider swapping out for? Prep for 1060! I do not care at all about noise at all!

Thanks
Ricorocks
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Re: GTX960 + GTX285

Post by Ricorocks »

Noctua NF-F12 iPPC 3000 PWM 109cfm. Is now the top dog in the hunt
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