Wat should i do for better gamming

Hi Everyone
I have a brand new cpu
-antec Twelve Hundred
-intel QX9650
-MSI N9800GX2
-4GB viper pc3-12800
-74 gb raptor velocity 10,000 rpm
-1000w thermaltake toughpower
and ...
the important is there i am running on vista64x but i like better win xp but only have 32bit software and xp takes only up to 2.5/3.5 gb depending on the machine and i would like to now wath i should do. Im lost and would like to get the best performance gamming for the stuck i buyed but without lowering my ram and ima be overcloking my cpu and ram

PS: I heard that windows xp server 2003 took up to 4 gb of ram but does anyone think i should change.

Thanks in advance.
Eric

I also like XP more than Vista, more so after all the problems with networking, etc, etc., 8GB's of 1066Mhz ram I don't want to waste. But I digress

I have Vista Ultimate x64 but more for regular or everyday use, honestly, I have it more for the wife than anything else. On the other partition, I have Windows 7 RC 7100 and so far, there is no game I can not play on it, I find it quicker than Vista and more stable.

Sure, it has its quirks but mostly, because it is different look and feel than what XP and or Vista are so I am still learning and understanding how to navigate thru it

thank for the advice
its late but ill post another post tomorow could u send me the link to llook it out for win7 cause ive saw it and did inded like it but never tested it i just got my psupply today so ima let it cool before modifing but ill post more tomorow thx and hope u repply
Eric

I would stay with Vista x64, i love it and would never go back to XP, i have no problems and i dont have a game that wont run on it, it you want to ramp things up a bit overclock your Cpu, i have a QX9650 and it does make a big difference. Just my two bobs worth.

Thanks for the reply
i am going to try vista for a while cause i wont downgrade for nothing but for now its running fine and ive not come to ovecloack yet but i know its realy possible and further possible with striker 2 xtreme motherboar so i wont worry thanks again and ill give u new about my run time of won vista

thx for replying
Eric