I've been testing some more with mine and i found that ramping the speeds up in one go gives errors in ATI tool, slowly working your way up works fine though.
I also found that once i got yellow polygons in ATI tool i had to raise memsppeed a bit and i could continue clocking the shaders.
Strange but true, here's where i ended, stock cooler, no vmod and fan at 80%:
Asus Crosshair V Formula-Z | FX 8350 | 2x4GB Trident-X 2600 C10 | 2x ATI HD5870 Crossfire | Enermax Revo 1050watt | OCZ Vertex 3 60GB | Samsung F1 1TB
Watercooling: XSPC Raystorm | EK 5870 Delrin fullcover | TFC X-changer 480 w/ 4x Gentle Typhoon | DDC2+ Delrin top | EK 200mm res | Primochill LRT 3/8 tubing
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