XP pro x64 4gb installed only shows 2.6gb usable8gb RAM shows only 3.4gb usable Tags: Memory Asus Windows XP RAM X64 Kingston Cybersurfers January 29, 2013 4:09:27 AM I have ASUS A8N-CM CSM motherboard XP pro x64 bit OS 4GB Kingston VALUE RAM kvr400/1gr SHOWS ONLY 2.6 GB USABLE More about : pro x64 4gb installed shows 6gb usable8gb ram shows 4gb usable Can't find your answer ? Ask ! Publish Related resources: ForumInstalled 4gb of RAM memory, but BIOS says only 2.5gb are usable ForumOnly 3gb Usable out of 4gb Memory in Windows 7 Forum4GB w/Vista x64 only 2.8GB usable ? tried everything ? Forum8GB RAM Installed w/ Vista x64 , only recognizing 4GB ForumIam using asus mb & nvidia 7025 chip set and 4gb of ram but it shows only 3g ForumWin7 64bit 6gb RAM shows only 2gb usable ForumI have 4Gb of ram my windows xp is showing only 2gb? Forum64-Bit Windows 7 Shows 2.75GB Usable Ram out of 4GB ForumI installed 6 GB ram in win 7 pro but it only showes 3.18GB ForumI have 3gb RAM , but XP only showing 2Gb? Forumvista x64 only shows 3.2GB Forum4gb of ram only 3 usable Forum8.00 gb installed only 3.92 usable Forum6GB of RAM only allowing 4GB ForumI have 4Gb of ram my windows xp is showing only 2gb? ForumWhen we finally can’t attained athletic subject, ForumCan I use 2 different sets of RAM modules in one motherboard? Forum[Solved] Need help choosing RAM ForumBuffered VS unbuffered RAM for minecraft server ForumRam capatability More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !