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270X Crossfire utilization question

  • Crossfire
  • Graphics
Last response: in Graphics Cards
February 28, 2014 1:13:34 PM

I have 270X's in Crossfire OC'd to 1150 core and 1500 mem on a Sabertooth 990FX board with an FX8320 OC'd to 4.2ghz and 16gb (4x4) CAS9 1333mhz memory.

My question is: when running Unigine Heaven 4.0 and using Afterburner to monitor temps, gpu utilization, and clocks it shows GPU1 at 100% utilization while GPU2 is peaking at about 85% utilization. Is this normal, an indication of bottlenecking, or too high an OC?

My 8320 passed the standard Intel Burn Test so I know the CPU is stable.

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February 28, 2014 1:22:39 PM

Depends a little on crossfire optimizations and the game or bench, but I have seen it before. Some games will use both to 100%, others will use the primary a bit more. Remember that the primary also has the task of compositing data from both cards into the single output frame to your monitor, so there's a little bit of overhead there as well.

Side note: Consider upgrading to DDR3 1866 RAM for that system, or see if your 1333 can be OC'd to 1600. Just a suggestion. ;) 
February 28, 2014 1:30:41 PM

Thanks! If my PNY memory is at 9-9-9-24 at 1333mhz, what do you suggest for 1600mhz?

Also, what does "lapped to copper" in your sig mean? Can the FX 8 series be lapped bare?