Overclocking a video card is easier than it ever has been thanks to the various driver level tweaks and third party applications but testing the performance of overclocked cards just keeps getting harder.  Warm up times have become a vital part of testing thanks to both NVIDIA and AMD providing dynamic clock speeds based on load and temperature; doing only a few short benchmarks no longer provides an accurate assessment of performance.  This is why [H]ard|OCP has revisited the XFX R9 290X Double Dissipation Edition to see the effects of overclocking.  They tested both single card configurations and Crossfire with default voltage and after bumping the juice up a bit.  Check it all out right here.

"We have already reviewed the XFX R9 290X DD. It is now time to see how far we can overclock the XFX R9 290X Double Dissipation Edition video card. We will be looking at single card performance advantages as well as CrossFire performance advantages by overclocking two XFX R9 290X video cards."

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