I've run Crysis (High/maxAA/1680x1050) on my machine under Windows XP x86 and x64... i did notice a jump up when I booted into my x64 partition over the x86 partition (but this was only on the flight deck of the aircraft carrier when the boss comes out)..
I did NOT however notice any drop-off when going from x64 Windows XP (DX9) to Windows Vista x64 SP1 (DX10). it still performs rock-solid.
So by that rationale DX9-XP-32bit runs SLOWER than DX10-Vista-64bit... are you saying they should test in XP-32bit-DX9 (common whore) or XP 64bit DX9 (rare)???
my guess is that overall XP64 will give the best results... but not a noticible difference from Vista64..
and i know i excluded Vista x86... but who cares it was a moronic release for morons.
BTW.. people.. must we use IQ for Image Quality.. it's rather confusing dontcha think??
Thanks for this, I was wondering if there was any noticeable difference between XP & Vista 64bit (although most games arent very optimised for 64bit). I have XP Pro 32/64bit and Vista Business 32/64bit. I am currently dual booting XP32/64 with 64bit being a permanent clean os for gaming (except up-to-date and with an AV), and 32bit being my sloppy os with programs installed that have been used only once for one purpose at the time. Now that I've recently upgraded my ram to 4GB and have two 8800GTS's on the way, I'm planning on dual booting XP64 and Vista64, playing dx9 games on XP and dx10 on Vista.
I've played around with a XP64 and Vista Ultimate 32bit install on a core2 E8400 system and it performed very poor and sluggish compared to XP. I was hoping that it had something to do with the Ultimate bloatware. Your post gives me hope that I may actually enjoy dual booting with Vista 64