OS Upgrade

[sychnant]

Thinking of changing from Vista 32 bit Business to Win 7..64 bit premium when it arrives.Mainly because i was thinking of upgrading my memory from 2Gb to 6Gb. But as my machine is running my games ok at the moment will i see much of an improvement in things by just increasing the memory in that way?
Or should i just stick another 2Gb in my system and stay with Vista 32 bit for a while longer? ( I realise win 32 bit only sees 3 Gb)
Thanks Sychnant

Intel Core 2 Quad Pro Q6600 "Energy Efficient SLACR 95W Edition" 2.40GHz (1066FSB)
Arctic Cooling Freezer 7 Pro CPU Cooler
Abit IP35 Pro (Socket 775) PCI-Express DDR2 Motherboard
OCZ 2GB (2x1GB) PC2-6400C4 Dual Channel Platinum Revision 2 XTC Series DDR2(1.9-2.0 Volts-CL 4-4-4-15)
Western Digital Caviar SE16 500GB SATA-II 16MB Cache
Pioneer DVR-112DBK 18x18 DVD±RW IDE Dual Layer ReWriter
EVGA GeForce 8800 GT 512MB Superclocked- GDDR3 HDTV/Dual DVI (PCI-Express) -
Lian-Li PC-7 PLUS II Aluminium Midi-Tower Case
Corsair HX 620W ATX2.2 Modular SLI Compliant PSU
Win Vista Business 32bit O/S
HP 22" Monitor 1680x1050

 

[sychnant]

Thanks Guys. I was going to buy another 2X2 Gb sticks of the same memory i have but i see they only sell it in 1 Gb sticks Can i buy other ram with the same settings (latency etc) and mix it with the OCZ ram? or should i just stick an extra 2X1 Gb in and live with it untill i buy or build a complete new system in a couple of years..?
Thanks again for the advice..