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overclocking 670

davegt3

davegt3

davegt3

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Joined
30 Dec 2010
Posts
173
Hi I have just started playing with overclocking my 670's in sli. I've been benchmarking with heaven 4.0. As soon as I go above 70mhz increase on the gpu it gets unstable. But so all attempts to o erclock have resulted in a lower bench score than standard??

I've been doing the cpu first and then the memory once I've achieved the highest cpu that's stable. With the standard memory settings it's still a lower score than standard. Is this normal untill you do the memory as well?

Sorry I'm completely new to this so sorry if this doesn't make sense please help lol
 
You need to look at what your card is boosting to with the offset on the core.

I have 3 670FTW 4GB's in triSli and have them set at +50MHz for the core and +800MHz on the memory. With the core clock you should be looking at about 1200MHz boosted as two of mine will do 1250 but the other only 1215 so I have them all at 1215. I'm as stock volts as I found increasing the voltage gave no benefit on my cards.

The core and the memory have to work together so clocking one with out the other can lead to issues, I found that the memory clock gave me the biggest boost.
 
If you want to see what the best overclock your cards can do, it would be best to run them one at a time. MSI Afterburner is my choice for overclocking and start off high (+150Mhz on the core) and work down from that. If you have decent air flow in your case and good cooling on the cards, add a little more voltage (untick the box for voltage control). Run something like Unigine Heaven and if it passes a couple of loops, add some more - If it fails, lower by 20Mhhz and repeat till it passes a couple of loops and then go and play some games for a good spell.

If it passed Heaven but not a long spell of gaming, knock the core back by 20Mhz and see if that works and then repeat the same process for card 2. When you have achieved the maximum stable overclock on both cores, drop the OC by 13Mhz and run both cards in SLI. As for the memory overclock, go for +500Mhz and if there is pretty colours/grey triangles on the screen, that is too high but if not, sweet.

Edit:

Here is a small guide I wrote for overclocking with Precision X and the principles are the same, regardless of what GPU you are using, so it might help :)

http://forums.midlifegamers.co.uk/viewtopic.php?f=26&t=470
 
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