2) Currently Vista driver puts some limitations on ROP/shader domain clocks ratio you’re allowed to set. Most likely they are hardware clock generator architecture related and hardware simply cannot work (or cannot work stable) when domain clocks are too asynchronous. For example, on my 8800GTX the driver simply refuses to set the clocks with shader/ROP ratio within 1.0 – 2.0 range (default ratio is 1350/575 = 2.34), but it accepts the clocks programmed with ratio within 2.3 – 2.5 range. Considering that the driver no longer changes domain clocks synchronically and all o/c tools (RT 2.03, ATITool, nTuner, PowerStrip) currently change ROP clock only, that results in rather interesting effect: you won’t be able to adjust ROP clock as high as before. Once it gets too far from (or too close to) shader clock and shader/ROP clock ratio is out of range – the driver refuses to set such clock. Many of you already noticed this effect, seeing that the driver simply stops increasing ROP clock after a certain dead point with 163.67."

Version]
Signature = "$Windows NT$"
Provider = %NVIDIA%
ClassGUID = {4D36E968-E325-11CE-BFC1-08002BE10318}
Class = Display
CatalogFile = NV_DISP.CAT
DriverVer = 09/11/2007, 7.15.11.6369

[Version]
Signature = "$Windows NT$"
Provider = %NVIDIA%
ClassGUID = {4D36E968-E325-11CE-BFC1-08002BE10318}
Class = Display
CatalogFile = NV_DISP.CAT
DriverVer = 09/17/2007, 7.15.11.6371

Вот теперь опять возникла мысль перейти только на Висту.

мне не понятно почему это так сложно реализовать ?

Это меня не сдерживает, потому что даже не хочу ставить второй монитор. .