GTX295 Quad SLI action!

madness777

New member
Hey guys and girls!

This summer is quite boring, and since I have some hardware laying around, I'm just oozing with ideas, what I can do with it, but there's not a lot of people, with whom I can jibber-jabber about all this crazy stuff.
I think some people might still be interested how this stuff works and performs. This will basically be a mini review of the two cards, but, I ended up just measuring the power consumption of the setup, because most of the benchmarks and games were not optimized or would crash, because a GTX295 Quad SLI setup is HELL.
So I took my time to bench 2 GTX295, one is a single PCB version and the other is a dual PCB version. To introduce these two cards, both of the cards BIOS's were flashed to the same BIOS profile [Core: 675MHz / Mem: 1107MHz], so that the tests will be as close as they can be, and there is no interference when in Quad SLI. The benchmark I used was Unigine Tropics, because this is the only benchmark that is getting almost 100% scaling and everything else, and I mean EVERYTHING was crashing or getting worse scores than the bloody Intel integrated GPU (3000).
The setup I'm using is as follows:

Intel i7 2600k [2 profiles were used for measuring total system power consumption. One is the default, the second is overclocked to 4.5GHz @ 1.3v]
G.Skill RipJaws 4GB 2x2GB 1600MHz CL7 [2 profiles were used, the first is the default XMP profile, the second is overclocked to 2133MHz 9-11-10-28 @ 1.65v]
Gigabyte GA-Z77X-UD5H BIOS v16
2x GTX295 [4 setups were used for measuring the system power consumption. 1st was w/o GPUs, 2nd was the single PCB version, 3rd was the dual PCB version and the 4th was Quad SLI]
Samsung 840EVO 120GB
Seasonic Platinum Series 660W [Brand new]
OS is Windows 8.1 [All updates and everything]
Latest nVIDIA drivers [337.88]
Monitor Samsung2232BW 1680x1050

I was only measuring the power consumption of the system itself, from the wall.
You can already guess there are a lot of numbers to be written down. So I'll show you the setup first:

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This is the setup I'm using.

Let's get to it!

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The simplest way to show you the results. As you can see from the graph, the dual PCB version draws a little bit more power than the single PCB one. Also, the CPU overclock adds quite a bit to the whole system power draw. The thing I'm impressed the most, the PSU could handle all that power. It's amazing to say the least. 708Watts for a 660W PSU is no easy task.

To sum this up. The single PCB version beats the Dual PCB version in all areas, it's quieter, cooler, draws less power, doesn't squeal when under load and the design is not that complex.
And if you're still interested in doing a Quad SLI setup with 2 GTX295, I warn you, you will lose your nuts trying to get things to work as they should.

Now I just need to get my hands on more sweet juicy hardware, for more fun stuffs! :boink:

Hope you enjoyed reading!
 
Thanks for sharing something interesting. I really like how you mounted the motherboard to the wall. Looks awesome! Its kind of amazing how quad SLI on old cards draws so little power. If only newer cards could do that... :D
 
You need to get a bigger PSU fast as Quad SLI with a couple of GTX 295s are normally rock solid stable. I used to run mine with a 1000 watt PSU and even with that I think I was cutting it fine. IIRC correctly each card uses nearly 300 watts @stock.
 
Thanks for the advice, but no worries on the PSU side of things, this one was stable and I used it here just to test its stability. I have a TX850, tried it previously and it was completely the same. The SLI profile is messed up, and to add in, they are physically different cards. It might be a different story if the cards were the same.
 
Thanks for the advice, but no worries on the PSU side of things, this one was stable and I used it here just to test its stability. I have a TX850, tried it previously and it was completely the same. The SLI profile is messed up, and to add in, they are physically different cards. It might be a different story if the cards were the same.

Both of mine were identical Asus ones.
 
The thing I'm impressed the most, the PSU could handle all that power. It's amazing to say the least. 708Watts for a 660W PSU is no easy task. !
Yeah you'll find a lot of the better PSUs can actually handle more than they're rated for. The only catch of course is that the manufacturer doesn't guarantee their lifetime or performance at the higher loads.

If you want something to try, try running Prime95 and your Tropics Benchmark or something like Furmark at the same time. ;)
 
Yeah you'll find a lot of the better PSUs can actually handle more than they're rated for. The only catch of course is that the manufacturer doesn't guarantee their lifetime or performance at the higher loads.

If you want something to try, try running Prime95 and your Tropics Benchmark or something like Furmark at the same time. ;)

If I run prime while Tropics is running, the benchmark will lagg and will only come to ~400W system load. Furmark only works on 1 GPU, I can't run it on 4 GPUs, and I wouldn't even want furmark running on 2 GTX295, it would kill them.
This is the best test I could give it. Besides, I already reached the limits of this PSU, it triggered OCP/OWP twice so far.
 
If I run prime while Tropics is running, the benchmark will lagg and will only come to ~400W system load. Furmark only works on 1 GPU, I can't run it on 4 GPUs, and I wouldn't even want furmark running on 2 GTX295, it would kill them.
This is the best test I could give it. Besides, I already reached the limits of this PSU, it triggered OCP/OWP twice so far.
Nice to know the overcurrent protection is working then. ;)

Thanks for posting too, interesting to see experiments like this.
 
Trade TX850 + single PCB 295, with TTL :)
I think he should be able to trade them to Dual PCB 295 + ~1kW PSU...

Q : Is that Quad SLI faster in Unigine Tropics, than a single GTX 780 Ti ?
 
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Trade TX850 + single PCB 295, with TTL :)
I think he should be able to trade them to Dual PCB 295 + ~1kW PSU...

Q : Is that Quad SLI faster in Unigine Tropics, than a single GTX 780 Ti ?

TX850 is not mine, I borrowed it for a short while. I wouldn't trade the single PCB one and I don't need a 1kW PSU.

I don't know, because most benchmarks are in 1080p, but I have a 1050p monitor. I don't think so though.
 
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