SLI overclocking guide: How to maximize multi-GPU performance

Have you read our guide to overclocking your graphics card? You should! Overclocking a graphics card today is simpler and safer than ever, and with a bit of tuning you can extend the life of an aging graphics card or get even better performance out of a new one. But what if you don't have just one graphics card? What if you have two, or three, or even four running in SLI? How does that affect the overclocking process?

To answer that question, we had Nvidia distinguished engineer Tom Petersen sit down with us at the LPC, which is outfitted with four GTX Titans. In the video above, Petersen walks us through his overclocking process using EVGA PrecisionX 16 and gives us some tips on multi-GPU overclocking. Petersen gave us his advice on all our questions, including:

  • Which card you should plug your monitor into
  • Whether every card should be clocked at the same speed
  • The trade-off between core overclocking, memory overclocking, and heat
  • How far you should push voltage
  • How much VRAM do you really need for modern games?

The specific overclocking process we go through obviously only applies to Nvidia cards, but most of the advice is also good for AMD Crossfire users. The second page of our overclocking guide shows how to tweak power settings and clock speeds in the Catalyst Control Center.


As hardware editor, Wes spends slightly more time building computers than he does breaking them. Deep in his heart he believes he loves Star Wars even more than Samuel Roberts and Chris Thursten, but is too scared to tell them.
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