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Overclocking in SLI

post #1 of 7
Thread Starter 
Heihei:)

From MSIAfterburner:

GPU1
________________________________________________________________________________
Display device : MSI GTX670 Power Edition on GK104 GPU
Display driver : 320.49
BIOS : 80.04.5c.00.29
GUID : VEN_10DE&DEV_1189&SUBSYS_28421462&REV_A1&BUS_1&DEV_0&FN_0
Multi-GPU role : master

GPU2
________________________________________________________________________________
Display device : MSI GTX670 Power Edition on GK104 GPU
Display driver : 320.49
BIOS : 80.04.4b.00.47
GUID : VEN_10DE&DEV_1189&SUBSYS_28421462&REV_A1&BUS_2&DEV_0&FN_0
Multi-GPU role : synchronized with master


Looking into clocking these cards but i have some questions:

1. I have same displaydrivers but different BIOS, is this a problem?
2.The mastercard is slightly faster than the slave at default setting. It also have more RAM (2048 vs 2112). Should i try to get them as equal as possible or push each of them as much as they will go individually?

thx:)
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post #2 of 7
They should OC just fine. I dont see how the other card could have 2112mb of ram. Its probably just a miss-detection of it on the driver side of things.
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post #3 of 7
...I'm definitely not particularly great at overclocking GPUs....but from what I understand about overclocking in SLI with 6 & 7 series NVidia GPUs is that the master card will always boost a little more than the slave...
post #4 of 7
Thread Starter 
The fastest card was also fastest as slave. Fastest one peaks at 1215Mhz, mem3005Mhz, shader2430Mhz. The slowest at 1163Mhz, mem3005Mhz, shader2325Mhz.
I got the mem value from CPU-Z
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post #5 of 7
If you can't find an official vBIOS from MSI then you can always export the one you have on GPU 1 (.5C) and flash that to the second card, then they match .. but there's no real need to unless you know there's a problem with the older vBIOS (.4B).

I'm still not 100% sure but I believe that whichever card runs faster, will slow down to the same speed as your slower card.
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post #6 of 7
Thread Starter 
thxm8:)

Not gonna touch BIOS ver. if i dont have to so as long as everything is running smooth they stay as they are.
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post #7 of 7
Quote:
Originally Posted by error-id10t View Post

If you can't find an official vBIOS from MSI then you can always export the one you have on GPU 1 (.5C) and flash that to the second card, then they match .. but there's no real need to unless you know there's a problem with the older vBIOS (.4B).

I'm still not 100% sure but I believe that whichever card runs faster, will slow down to the same speed as your slower card.

Yap, thats how SLI works!

Ed
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