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We already know that the overclock of video card radeon HD 2900 XT is not difficult . But to cool this video card and attain stable work at high frequencies is not so simple, The performance of radeon HD 2900 XT is well scaled with overclock . As example of successful overclock using two Radeon HD 2900 XT working in crossfire you can check this reference XtremeSystems.org .
Recently with the aid of two overclocked video card GeForce 8800 Ultra , it was possible to set a new world record 25 733 point in 3DMark'06 . After overclocking the pair of video cards radeon HD 2900 XT with 512 mb GDDR3 memory to frequencies 1080/1900 MHz using liquid nitrogen and voltmods, Scandinavian overclockers reached the result 25 523 points in 3DMark'06. The central processor core 2 Extreme QX6700 (2.66 GHz) was overclocked to the frequency 5017 MHz.
Thus, between the two cards Radeon HD 2900 XT and the two card GeForce 8800 Ultra the deference compose only 210 points. The authors of experiment assert that the results can be improved after motherboard replacement ( from Asus P5W64 WS pro (Intel 975X) to Asus blitz extreme (Intel p35) ). Let us recall that this last motherboard realizes the effective work of graphic slots in the regime PCI express x8 + PCI express x8, and the chipset intel p35 is characterized by good speed and high overclocking potential.
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