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Getting worse performance with sli over single gpus

post #1 of 21
Thread Starter 
Im just playing 2 games at the moment.

DCS a10 and witcher 2.

Both games have about a 15-20% dropoff in fps once I enable sli, and are much smoother with sli disabled.

I guess that brings me to the question... why am I wasting all this electric on 2 extra gtx 280s?
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post #2 of 21
What drivers are you using.
 
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post #3 of 21
Thread Starter 
Quote:
Originally Posted by Ascii Aficionado View Post
What drivers are you using.
Let me see. I have flopped around alot. At the moment its 275.50

Shouldnt sli be getting at least the same amount of performance?

Im just worried that maybe my cards are damaged.
Edited by bloomstomb - 7/26/11 at 8:48pm
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2x 300 gig velociraptor in Raid 0 for strorage,  120 gig corsair SSD boot drive dvd r/rw 480 mm bix radiator dedicated to video cards, 1... 
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post #4 of 21
Quote:
Originally Posted by bloomstomb View Post
Let me see. I have flopped around alot. At the moment its 275.50

Shouldnt sli be getting at least the same amount of performance?

Im just worried that maybe my cards are damaged.
I wanted to make sure you were using a certain version as that fixed TW2 SLI issues.

There could also be issues with those cards and triple SLI in that game, I have no idea.
 
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post #5 of 21
Bottleneck, perhaps its using up SO much CPU that it is actually slowing down your game, which is why im never going to be able to Xfire my HD5850's.
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post #6 of 21
Have you tried changing the SLI rendering mode?
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post #7 of 21
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post #8 of 21
Your running tri with a core 2 quad? Major cpu bottleneck
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post #9 of 21
Even if it was a bottleneck, he shouldn't be losing performance with SLI enabled. At worst he would just see zero gains.

How are your temps op? Obviously tri-sli is going to put out a lot of heat, so the cards may be throttling.

Can you post a Vantage score? It should help determine if your rig is underperforming.
post #10 of 21
Thread Starter 
Apology for crappy uploads, but heres some readings on both cpu and video cards, with and without sli.

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I7 2600k Sandy Bridge@4200 mhz , 1.24 v stable P67 FTW 3x EVGA gtx 480 hydrocooled  ddr3 2133 gskill ripjaws. 
Hard DriveHard DriveOptical DriveCooling
2x 300 gig velociraptor in Raid 0 for strorage,  120 gig corsair SSD boot drive dvd r/rw 480 mm bix radiator dedicated to video cards, 1... 
OSMonitorKeyboardPower
windows 7 x64 3x dell 2408wfp check Toughpower 1200watt 
CaseMouseMouse PadAudio
Lian-Li pc-p80 check check Bose sound system 
Audio
Bose sound system 
CPUMotherboardGraphicsRAM
I7 2600k Sandy Bridge@4200 mhz , 1.24 v stable P67 FTW 3x EVGA gtx 480 hydrocooled  ddr3 2133 gskill ripjaws. 
Hard DriveHard DriveOptical DriveCooling
2x 300 gig velociraptor in Raid 0 for strorage,  120 gig corsair SSD boot drive dvd r/rw 480 mm bix radiator dedicated to video cards, 1... 
OSMonitorKeyboardPower
windows 7 x64 3x dell 2408wfp check Toughpower 1200watt 
CaseMouseMouse PadAudio
Lian-Li pc-p80 check check Bose sound system 
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Bose sound system 
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Hard DriveHard DriveOptical DriveCooling
2x 300 gig velociraptor in Raid 0 for strorage,  120 gig corsair SSD boot drive dvd r/rw 480 mm bix radiator dedicated to video cards, 1... 
OSMonitorKeyboardPower
windows 7 x64 3x dell 2408wfp check Toughpower 1200watt 
CaseMouseMouse PadAudio
Lian-Li pc-p80 check check Bose sound system 
Audio
Bose sound system 
CPUMotherboardGraphicsRAM
I7 2600k Sandy Bridge@4200 mhz , 1.24 v stable P67 FTW 3x EVGA gtx 480 hydrocooled  ddr3 2133 gskill ripjaws. 
Hard DriveHard DriveOptical DriveCooling
2x 300 gig velociraptor in Raid 0 for strorage,  120 gig corsair SSD boot drive dvd r/rw 480 mm bix radiator dedicated to video cards, 1... 
OSMonitorKeyboardPower
windows 7 x64 3x dell 2408wfp check Toughpower 1200watt 
CaseMouseMouse PadAudio
Lian-Li pc-p80 check check Bose sound system 
Audio
Bose sound system 
CPUMotherboardGraphicsRAM
I7 2600k Sandy Bridge@4200 mhz , 1.24 v stable P67 FTW 3x EVGA gtx 480 hydrocooled  ddr3 2133 gskill ripjaws. 
Hard DriveHard DriveOptical DriveCooling
2x 300 gig velociraptor in Raid 0 for strorage,  120 gig corsair SSD boot drive dvd r/rw 480 mm bix radiator dedicated to video cards, 1... 
OSMonitorKeyboardPower
windows 7 x64 3x dell 2408wfp check Toughpower 1200watt 
CaseMouseMouse PadAudio
Lian-Li pc-p80 check check Bose sound system 
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