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Lower fps with sli enabled

post #1 of 2
Thread Starter 
I have 2 GTX 285's in SLI. I've had both these cards since they came out and ive been getting problems lately with it.


With SLI enabled I get very low fps and lots of lag, with sli disabled I get good FPS and it's all smooth.


I tried different drivers, I cleaned the old ones out with driver sweeper, messed around with sli cable etc.. everything worked fine for 2+ years and now its acting up. The only thing i've done in the past few months is reinstall windows, but i've downloaded all the needed files.


Tested both cards on its own, they both work fine.


motherboard is asus p6t vanilla, 850W antec PSU. running a core i7 @ 4.2ghz with 6gb ram

games i've tryed are dirt 2, dirt 3, cs source, cod4, mw3, black ops, skyim. with SLI enabled i get around 30 or so FPS and tons of lag.



Do you guys have any ideas on how I can fix this? Cards aren't over heating or anything either. They run at around 60-70c load
pwn some noobs
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CPUMotherboardGraphicsRAM
x5650 asus p6t gtx 980 ti  16gb kingston hyperx fury 
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1.25tb Windows Vista 7 x64 600w thermaltake  cosmos s 
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pwn some noobs
(13 items)
 
  
CPUMotherboardGraphicsRAM
x5650 asus p6t gtx 980 ti  16gb kingston hyperx fury 
Hard DriveOSPowerCase
1.25tb Windows Vista 7 x64 600w thermaltake  cosmos s 
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post #2 of 2
Did the problem occur immediately after you reinstalled Windows?

If not, then I would say that was just a coincidence. Likely, one of those cards is developing problems. Try the two cards one at a time, and make sure that you get approximately equal performance out of each of them.

If they both work fine, then the only thing I can think of is a driver error. What drivers have you tested?
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