Has anyone tried a Tri-Sli with 3 GTX 295's?

[Airbrushkid]

Just wondering if someone did the tri-sli with 3 gtx 295's that be wild as hell. Just think 6 gpu's!:captnkill:

[pakotlar]

i dont doubt that its possublee to do from an engineering standfpoint (with current hardware), but youd be looking at up to a 6 frame delay and(well actually more is possible) and the software isn't there. CPU overhead would grow somewhat too, so for many games you'd notice a sizeable decrease (when load blanching wouldn't bring enough gains.

[Sazar]

Who cares about the delay. Imagine the folding horsepower :cool:

[|MaguS|]

Um it wouldn't be Tri-SLi with 3 295GTX since each is already SLi... that would be Six-SLi which I don't think is supported... only Quad SLi (Two 295 GTX).

[lee63]

You cant Tri SLi 295s...it would be one bad a$$ rig if you could.

[JasonPC]

You can only connect one SLI bridge to the GTX 295 so quad SLI is the maximum.

[jAkUp]

6-way SLI is not supported in the drivers, however, you could use it for folding.

[Airbrushkid]

Thank you for the replies guys. It would be sick if you could do 6 way sli.

[Dazz]

Working for Cyberpower System we have experimented with it, 3 way SLI will not work and folding on a 3 way SLI board will also mean much much lower performance. We found on a X48 board or a Crossfire board Folding performance is almost doubled. one of the cards dual GPU's will refuse to work correctly on SLI motherboards. Just a word of advice, as we build high end gaming systems and folding systems for medial research and data centres.

[Muppet]

You can only connect one SLI bridge to the GTX 295 so quad SLI is the maximum.

You don't need to use the bridge for SLI. It will result in lower performance though.

[Gort]

Um, that would be six-way, not three-way.

[FastRedPonyCar]

I would imagine that if nvidia supports 3 295's it would still be a bottleneck in an overclocked i7 platform. A few reviews with dual 295's and 3X285 tests confirm that they are still the bottleneck (rather than cpu limitations) when it comes to high resolution max AA/AF Crysis testing.

[ChrisRay]

You don't need to use the bridge for SLI. It will result in lower performance though.

This is actually untrue. For 3 Way SLI. A bridge is required. And for 6 way it would be even more mandated. The reason being is PCIE bandwith may be enough ((albeit slower)) to drive 2 cards in AFR mode. The more GPUS will greatly increase the latency required for SLI operation and would end up causing a serious performance deficit.

[LabShark]

Nah - 2 is enough for me. :)

[JasonPC]

People have used 3 or more it for folding and even "home supercomputing"

But that's not SLI...

[hemmy]

Working for Cyberpower System we have experimented with it, 3 way SLI will not work and folding on a 3 way SLI board will also mean much much lower performance. We found on a X48 board or a Crossfire board Folding performance is almost doubled. one of the cards dual GPU's will refuse to work correctly on SLI motherboards. Just a word of advice, as we build high end gaming systems and folding systems for medial research and data centres.

Folding performance is definitely not lower with 6 gpus if you use them correctly.

[Muppet]

This is actually untrue. For 3 Way SLI. A bridge is required. And for 6 way it would be even more mandated. The reason being is PCIE bandwith may be enough ((albeit slower)) to drive 2 cards in AFR mode. The more GPUS will greatly increase the latency required for SLI operation and would end up causing a serious performance deficit.

I was actually only replying to a post above that said SLI was not possible without the Bridge. That is wrong in that SLI will function without the Bridge. Sorry, I was only talking about 2 way SLI.

[JasonPC]

Well I assumed you'd use an SLI bridge on a high end card like that. I never really put it to the test but I thought not using an SLI bridge was more of a thing for lower end cards.

[ChrisRay]

I was actually only replying to a post above that said SLI was not possible without the Bridge. That is wrong in that SLI will function without the Bridge. Sorry, I was only talking about 2 way SLI.

Understood. Just thought Id clear up any misconceptions incase someone else misunderstood. :)

[JackOfAll]

Who cares about the delay. Imagine the folding horsepower :cool:

70K PPD. ;) These are Palit single PCB GTX295's with EK FC-295 water blocks, clocked to 684/1476/1080, same as FTW spec.

http://www.vacuumtube.org.uk/images/IMG_2253_800.jpg

http://www.vacuumtube.org.uk/images/IMG_2249_800.jpg

[Bman212121]

70K PPD. ;) These are Palit single PCB GTX295's with EK FC-295 water blocks, clocked to 684/1476/1080, same as FTW spec.

http://www.vacuumtube.org.uk/images/IMG_2253_800.jpg

http://www.vacuumtube.org.uk/images/IMG_2249_800.jpg

All I have to say is WOW. :drooling:


EDIT: Alright I have to say more. I'm really impressed by the build. I've seen a lot of folders who only go halfway to build their F@H rigs. Nice you see you go with the water setup to make sure the heat stays down versus throwing 4 gpus stacked in there with an underpowered PSU. How much power does that setup draw when loaded?

[JackOfAll]

I'm really impressed by the build. I've seen a lot of folders who only go halfway to build their F@H rigs. Nice you see you go with the water setup to make sure the heat stays down versus throwing 4 gpus stacked in there with an underpowered PSU. How much power does that setup draw when loaded?

The build has changed a little since those pictures were taken - mostly power supplies, wiring and tubing routing.

Main power supply is an Enermax Revolution 1250W. Secondary power supply is a Thermaltake W0158 650W Toughpower Power Express VGA PSU. The Tt powers 2x GTX295, Enermax everything else. Total power draw from the wall (both supplies) is just over 1200W.