i noticed a wierd issue with Windows 7 Ultimate RC1 and the RAM that i am using Current PC config:- E4500@ 2.2Ghz OC'd 3Ghz 2x1GB Team Xtreem DDR2 @800 Mhz 4-4-4-12 2x2GB Team Xtreem Dark DDR2 @800 Mhz 4-4-4-12 Nvidia 8600GT Anyways, windows 7 was running fine when i had the CPu OC'd to 3Ghz and 2x1Gb OD's to 500Mhz 4-4-4-12. Windows 7 showed that 2 GB RAM was installed Once i added 2x2Gb, it shows 6Gb installed (5.50Gb usable). Now if i re-install windows 7, it first shows the RAM as 6Gb...after a couple of reboots goes back to 6Gb installed (5.50Gb usable). From what i know, this issue is supposed to be with 32bit OS'es as they are unable to recognize more that 4 Gb of RAM. I'm using the x64 edition and facing a similar problem. Any suggestion/tips will be appreciated. Thanx in advance.