Dell Optiplex gx620, RAM limits Tags: Optiplex RAM Dell Motherboards Windows XP Last response: October 8, 2012 3:28 PM in Windows XP Share atxpiper October 8, 2012 3:32:28 AM I have a Dell Optiplex gx620 motherboard and have installed 8GB of RAM memory. From previous posts I see the limit for that motherboard is 4GB, but in BIOS it sees all 8GB. Will programs running on my XP computer use all 8GB? More about : dell optiplex gx620 ram limits Hawkeye22 a b V Motherboard October 8, 2012 1:16:30 PM The manual indeed says 4gig of ram. A bios update may have allowed it to see 8 gig, not sure. Anyhow, XP 32 bit will only see ~4gig of ram. You need a 64 bit OS to see more than 4 gig. m 0 l atxpiper October 8, 2012 2:23:20 PM Is seeing the same as using? For example, if I were to play a RAM intensive game, would it use only the 4gb seen by xp or the entire 8gb I physically have installed? Also, another follow up question that's probably stupid, will a OS upgrade to 7 allow programs to use all the RAM installed or is the limitation set by the motherboard? Thanks m 0 l Can't find your answer ? Ask ! Get the answer Hawkeye22 a b V Motherboard October 8, 2012 3:28:30 PM It will only use the 4 gig. As stated, you need a 64 bit OS to be able to use over 4 gig. m 0 l Can't find your answer ? Ask ! Publish Related resources RAM/Memory Issue - Dell Optiplex GX620 Forum Solvedgpu for Dell optiplex gx620 desktop Forum SolvedBest Possible Dell Optiplex GX620 SFF Upgrades? Forum Solvedmount the motherboard Dell optiplex GX620 in a GX280 Forum SolvedDell optiplex gx620 hard drive Forum SolvedHow to upgrade a Dell Optiplex GX620? Forum SolvedWill a Sapphire Radeon x1900 xt fit into my Dell Optiplex GX620? Forum SolvedDell Optiplex GX620 SFF Motherboard Switch Help Forum SolvedDell Optiplex Gx620 sff Heatsink help Forum SolvedDell Optiplex GX620 SFF Pentium D heatsink upgrade? Forum SolvedDell Optiplex GX620 Memory Upgrade Forum Solveddell optiplex GX620 cpu upgrade Forum SolvedDell Optiplex GX620 and PNY GeForce GT 620 Issue Forum SolvedMemory upgrade Dell Optiplex GX620 Forum Dell optiplex gx620 orange/amber light on power button and it wont boot up Forum Reset dell optiplex gx620 completely back to factory settings with no disk Forum SolvedDell Optiplex GX620 case Forum SolvedDell Optiplex GX620 GPU upgrade Forum SolvedMaxxed out Dell optiplex GX620 Forum SolvedCPU upgrade for dell optiplex gx620 Forum More resources Read discussions in other Windows XP categories Configuration Customization Drivers Security Video !