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| SLI benchmarks http://www.runestorm.com/forums/viewtopic.php?f=6&t=43986 |
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| Author: | Tyster [ Tue Oct 16, 2007 9:58 am ] |
| Post subject: | SLI benchmarks |
I did a little study about SLI vs. single GPU. I had previously found that in Aquamark, my score raised by 15% when I changed form single GPU to SLI (with 2 identical GeForce7900 GS cards). Now, I performed a test with uMark. Every time I switch operating systems or actiuvete/deactivate SLI, I restart my computer. Also, note that the SLI rendering mode is set to "Single GPU" instead of split-frame rendereing (split-frame seems to decrease SLI performance). Here are the results [br][img width=800 height=257]../../files/public/1192549997_244_FT0_temp_.jpg[/img][br] As expected, 64-bit processing does have an advantage, but check out the averages for single GPU vs. SLI. SLI decreases performance in UT2004?!?!?!?!?!?!? I told myself that that must simply be some strange fluke, so I played the UT3 demo with SLI and noticed that the framerate is about 30 FPS without sli and 20 FPS with SLI. Does that mean that the unreal engine versions 2 and 3 don't like SLI? |
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| Author: | cyberax [ Tue Oct 16, 2007 11:41 am ] |
| Post subject: | SLI benchmarks |
Interesting results! It's difficult to point to an exact thing and say, thats why! There are quite a few factors that could affect performance. Check tomshardware website. they have various tests of SLI cards, and I must say, none of them are really a "mind blowing" difference over a single graphics card.... |
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| Author: | Tyster [ Tue Oct 16, 2007 12:03 pm ] |
| Post subject: | SLI benchmarks |
Will do, sometime. I sohould add that for the tests, I tried to keep everything identaical. The different operating systems may have different applications running, but within the same OS, everything else should be the same. |
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| Author: | Tyster [ Wed Oct 17, 2007 10:34 am ] |
| Post subject: | SLI benchmarks |
Also, let me add that while playing Oblivion, the use of SLI has a significant increased framerate of single GPU. I have no quantitative data, but could simply feel the different when walking through the same areas (using 64-bit XP Pro). I'm getting suspicious that UT simply doesn't like SLI... |
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| Author: | Bjossi [ Wed Oct 17, 2007 12:11 pm ] |
| Post subject: | SLI benchmarks |
UE2 games have always been far more CPU-dependant than GPU. |
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| Author: | Tyster [ Wed Oct 17, 2007 9:52 pm ] |
| Post subject: | SLI benchmarks |
Would SLI add a load to the CPU? If it does, then I guess this would make sense. I had the same CPU and drivers for all tests, so maybe this could indicate that the CPU manages the SLI configuration? |
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| Author: | Bjossi [ Thu Oct 18, 2007 7:06 am ] |
| Post subject: | SLI benchmarks |
CPU and GPU work together, SLi therefore requires more CPU than a single GPU setup. |
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