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 Installed 4gb of RAM memory, but BIOS says only 2.5gb are usable Forum Only 3gb Usable out of 4gb Memory in Windows 7 Forum 4GB w/Vista x64 only 2.8GB usable ? tried everything ? Forum 8GB RAM Installed w/ Vista x64 , only recognizing 4GB Forum Iam using asus mb & nvidia 7025 chip set and 4gb of ram but it shows only 3g Forum Win7 64bit 6gb RAM shows only 2gb usable Forum I have 4Gb of ram my windows xp is showing only 2gb? Forum 64-Bit Windows 7 Shows 2.75GB Usable Ram out of 4GB Forum I installed 6 GB ram in win 7 pro but it only showes 3.18GB Forum I have 3gb RAM , but XP only showing 2Gb? Forum vista x64 only shows 3.2GB Forum 4gb of ram only 3 usable Forum 8.00 gb installed only 3.92 usable Forum 6GB of RAM only allowing 4GB Forum I have 4Gb of ram my windows xp is showing only 2gb? Forum When we finally can’t attained athletic subject, Forum Can I use 2 different sets of RAM modules in one motherboard? Forum [Solved] Need help choosing RAM Forum Buffered VS unbuffered RAM for minecraft server Forum Ram capatability Forum More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !