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Evga gtx660 sc sli throttles when bios is modded?

post #1 of 5
Thread Starter 
I have 2*Evga gtx660 sc. And i got Yungbenny here on the forums to mod one of the bioses for the cards. He told me how to use the modded bioses and such, very helpfull. And i know he knows those gtx660 cards. But my problem is when i flash the modded bios and sucessfully oc the cards to boost to 1200mhz and they do when i run 3dmark11. But the cards throttle down so i get about 1k less points in 3dmark11. So i wonder there are 2 different bioses for my cards, do i have to mod those seperatly cause when i tried i only tried with one of those modded bioses. Maybe i should mod 1 bios at the time and flash them seperatly? Could that be my problem?
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post #2 of 5
Thread Starter 
Hmm doesnt anyone have a clue what might be wrong? This is the biggest and best overclockers forums there is, surely someone should have had the same problem as me?

I tried to mod and flash each bios seperatly last night with no sucess! Only things i come to think to is that 1 card is faulty and doesnt boost as it should. Hardware failure in other words. And the other things is that the tdp gets to high for my psu to handle? See rig for wich psu i have and if my psu is sufficient for my oc´d rig and can handle it? This thing drives me mad. I run my bench at stock volt and 1175mhz and im on top on 3dmarks results. then by just changing the volt max to 1.2v and tdp to 150% and fans to be able to run at 100% and the speed to 1200mhz. It runs trough 3dmark11 fine but still gives me approx 1k less points on graphics? The cards throttles down and my temp is maybe 65c with fans runniong at 100%. Argghh it drives me crazy and i wont give up until i find out how to solve this ****! I come to think about one thing to do now biggrin.gif
What about removing one card at the time and run them seperatly in 3dmark, first with stock voltage and then with modded bioses. So a total of 4 runs and compare the results, that way i can see if one of the cards is fualty hehe! Cmon help me with pointers now!

The big question is: why does the cards throttle when just oc´d 25mhz extra and is within safe temps?
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post #3 of 5
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Please, someone must know stuff about this? Im clueless tbh, if you guys check my rig. Can it be that my psu puts out to little juice to the gpu´s and it throttles due to unstable power supply? This problem is driving me crazy. Im gonna go google around and check out Evga´s forum cause surely there should be happening to others with same brand of gtx660´s.
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post #4 of 5
I just bought a card from a guy here that had a different bios than the card I had for some reason. The cards didn't run right together. It gave me very bad Micro shutter in some games. Both bios should be the same if you want the cards to run right in SLI. Throttling happens because the first card will run at a higher temp than the second one. The first card will run about 25 Mhz slower than the second card which is normal. If the first card hit 70c and sometime even before that both cards will throttle. I would suggest either send the other card to the guy and get the second card flashed to the modded bios or have him flash it back to stock.
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by Cape Cod View Post

I just bought a card from a guy here that had a different bios than the card I had for some reason. The cards didn't run right together. It gave me very bad Micro shutter in some games. Both bios should be the same if you want the cards to run right in SLI. Throttling happens because the first card will run at a higher temp than the second one. The first card will run about 25 Mhz slower than the second card which is normal. If the first card hit 70c and sometime even before that both cards will throttle. I would suggest either send the other card to the guy and get the second card flashed to the modded bios or have him flash it back to stock.


Ahhh thanks alot it makes sense now biggrin.gif Thank you so much i will +rep you thumb.gif I will keep the cards at stock bios. and have them with a low overclock i get really good reults in benchs anyway and they perform good in games as well.
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