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With SLI do you need to match the clocks?

post #1 of 11
Thread Starter 
I have 2x gtx 670. One runs at 1293mhz under boost, the other maxes out at 1058mhz on the core, and the memory speed difference is 50mhz too. Do I need to make sure these clocks both match for best performance?

On battlefield 4 I just ran a benchmark on a big locker server and got minimum fps of 50, average 60fps on my 1440p monitor with all settings ultra but no AA. Does this sound right?

thanks
post #2 of 11
It will run at the speed of the slowest card.
   
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post #3 of 11
Thread Starter 
So I should overclock the slowest card then, thanks. Any ideas on how I can do it? Just OC the slowest gpu, leave the fastest alone until I get artifact/BSOD during gaming?
post #4 of 11
Quote:
Originally Posted by $ilent View Post

So I should overclock the slowest card then, thanks. Any ideas on how I can do it? Just OC the slowest gpu, leave the fastest alone until I get artifact/BSOD during gaming?

Yeah that will work. Thats a pretty big difference between the two though still in spec. Regardless, you will still see a nice performance increase. What kind of temps are you seeing with each card?
   
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post #5 of 11
Thread Starter 
Thanks

Max 46C on the 1293mhz gtx 670
Max 41C on the slower gtx 670.
post #6 of 11
Thread Starter 
Got the second 670 at 1254mhz now, not sure how much higher it will go!
post #7 of 11
Quote:
Originally Posted by $ilent View Post

Got the second 670 at 1254mhz now, not sure how much higher it will go!

Excellent numbers! good job. Played with memory at all yet?
   
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post #8 of 11
Thread Starter 
Well it wont go any higher than that lol, might be time to flash the 1.2v bios me thinks.
post #9 of 11
Quote:
Originally Posted by $ilent View Post

Well it wont go any higher than that lol, might be time to flash the 1.2v bios me thinks.

which 2 cards are they? brand and part numbers perhaps?
post #10 of 11
Thread Starter 
The 1293mhz card is the KFA2 gtx 670, part number - 67NPH6DV5ZVX
The second 670 is an EVGA one not sure of the model number sorry.

The KFA card is amazing, stock boosts to 1293mhz, but it doesnt go any higher. I would love to put it under ln2.
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