8 GB RAM only 3.90 GB Usable Tags: Asus RAM Dual Channel Motherboards Compatibility Last response: December 2, 2013 4:11 AM in Memory Share ankit360 November 14, 2013 11:14:14 PM 8GB Only 3.90 GB usable as per mobo manual i install KHX1600C9D3B1/4G RAM on slot A2 and B2 But BIOS show only 4 GB total RAM CPUZ show 8GB But Windows show 8GB 3.90 GB usable Same happen if i install RAM on A1 B1 slot PC won't Boot if i install RAM on B1 B1 slot If i install RAM on A1 A2 slot BIOS show 8GB RAM Windows also able to use all 8 GB RAM now I Build totally new PC With 2x Kingston HyperX Blu DDR3 4 GB PC RAM (KHX1600C9D3B1/4G) AMD FX 6300 (no overclock ) none pin bend Asus M5A97 LE R2.0 Help me guys More about : ram usable johnnyb105 a b V Motherboard November 14, 2013 11:47:45 PM install ram, slots 1 and 3 or 2 and 4 ok then it should post alright. m 0 l ankit360 November 14, 2013 11:53:24 PM johnnyb105 said:install ram, slots 1 and 3 or 2 and 4 ok then it should post alright. if i put it on slot 1 & 3 i get only 4gb ram windows show me 8GB (3.97GB usable) same with slot 2 & 4 if i put it in slot 1 & 2 is see all 8GB ram usable . but that's only on Single Channel mode m 0 l Related resources Only 3.90 GB of Memory Usable Out of 8 GB - Forum I have 8gb of RAM but I only have 4gb usable. - Forum 8gb ram installed, only shows 3.95gb usable. Pics inside - Forum 8gb ram detected, only 2.98 gb usable! - Forum 8gb of RAM, only 3.98 Usable - Forum Can't find your answer ? Ask ! Get the answer ankit360 November 15, 2013 10:57:36 PM main post update with detail . plz help me guys mod plz move this post to RAM section if required m 0 l aj2013 November 15, 2013 11:34:35 PM press windows key and r type msconfig click on boot, then advanced options, and make sure both cpu and ram is unchecked at the top then restart. m 0 l ankit360 November 16, 2013 1:10:59 AM aj2013 said:press windows key and r type msconfig click on boot, then advanced options, and make sure both cpu and ram is unchecked at the top then restart. it's already unchecked m 0 l ankit360 November 29, 2013 7:26:48 AM BUMP m 0 l ankit360 December 2, 2013 4:11:14 AM is it motherboard issue . i check RAM stick and don't get any problem with it m 0 l Can't find your answer ? Ask ! Publish Related resources Solved***URGENT*** 4 Months passed, no solution! 8 GB RAM recognized by BIOS and Windows 8.1 64 Bit, only 3.9/4080 MB usable! Help! Forum Solved8GB of RAM only 5.98GB usable?? Forum Solved8GB Of Ram Installed, only 4 showing w/ 3.47gb usable (I think I fixed it) Forum Solved8gb or ram but only 2.92 usable Forum SolvedI have 8GB of RAM, only 4GB is usable? Help please. Forum Solvedi have 8.00 gb of ram but only 7.89 usable why? Forum Solved8 GB ram, only 3.96 usable Forum SolvedMy RAM says 8.00 Gb but only 7.90 Gb usable Forum Solved8 gb of installed ram, only 2.96 usable Forum Solved8gb of ram only 4gb are usable ? Forum why is my 32 bit laptop with 8gb of ram saying that only 2.92gb is usable Forum SolvedMy Ram cards 16Gb and says only 12/8usable Forum SolvedInstalled ram 8gb usable only 3.41gb...? Forum Have 4GB installed ram but only 2.75GB usable Windows 8.1 pro x64 Forum 8gb RAM only 3.9 Usable Forum More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !