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OCC has published a review on the Sapphire Toxic HD 5970 4GB



To put it bluntly, this is the fastest, out of the box video card I have tested. The fact that you can run these clock speeds on a card of this stature with 4GB of memory is pretty amazing. With a small bump in voltage to the cores, I was able to reach 1000MHz without a sweat. I just wish I could have pushed further. Even AMD GPU OC Tool did not give me any love, so 100MHz worth of improvement on the cores is the highest benchmark stable clock speed I could pull from the cores.
Sapphire Toxic HD 5970 4GB Review