I have a Dell dimension 8400, with Win 7 Ultimate 3gs of memory, try to replace Tags: Chipsets Memory Dell Dimension Motherboards Last response: August 28, 2010 1:50 AM in Motherboards Share Anonymous a b } Memory a b V Motherboard August 28, 2010 12:55:40 AM Hello, More about : dell dimension 8400 win ultimate 3gs memory replace o1die a c 128 } Memory a c 434 V Motherboard August 28, 2010 1:50:09 AM 3 gigs of ram will run windows 7 fine; dell boards can be picky about ram upgrades. I would leave it alone, even if using the 64bit windows 7. Spending the money won't gain you enough to make it worthwhile. Can't find your answer ? Ask ! Publish Related resources: ForumDell Dimension 8400 PSU replacement ForumDell Dimension 8400 wont boot up ForumXfx ati radeon hd 5750 compatibility in dell dimension 8400 ForumEmu 0404 Causing Dimensional Rift! < Dell Dimension 8400 ForumDimension 8400 cpu upgrade ForumDell Dimension 8400 CPU Upgrade to Dual Core ForumBad cooling on Dimension 8400 ForumHELP!! Installing Win 7 64 bit on a Dell 8400 Running out of time!! ForumDell Dimension 8300 ForumPC2700 memory in a Dimension 8400 ? ForumWin 7 Ultimate > System Restore every day! ForumCan't Install Win 2K Or XP Pro on Dell Dimension 8400 with .. ForumDell Dimension 8400 CPU upgrade ForumDimension 8250 Memory ForumWhen we finally can’t attained athletic subject, More resources Read discussions in other Motherboards categories BIOS Boot Chipsets ASRock Asus Chaintech DFI Elitegroup FIC Foxconn Gigabyte Intel MSI-Microstar !