x64 Win7 is reporting only 3GB out of 4GB RAM

Guys, this is too hectic. The OP has a 64bit system. So none of the 32bit explanations apply. The Resource Monitor reports 1GB as hardware reserved. So the full 4GBs are there. Question is only which hardware has reserved this 1GB.

DreemWarrior said:

whs said:

Guys, this is too hectic. The OP has a 64bit system. So none of the 32bit explanations apply. The Resource Monitor reports 1GB as hardware reserved. So the full 4GBs are there. Question is only which hardware has reserved this 1GB.

True. I think i shall leave this one to all you heavyweights in here, but dont think I'm not paying attention...

Dreamwarrior, no need to pout. I was only suggesting that we work with the facts we know and approach the problem systematically. And you are, of course, very welcome to participate. The only "heavyweights" around here are heavy in pounds.

DreemWarrior said:

Here is the issue...


"If you are running 64-bit Windows, you may have to live with it. Depending on your motherboard's chipset, your system may support memory remapping. If so, you will be able to use all 4GB of RAM. Detailed:
Due to an architectural decision made long ago, if you have 4GB of physical RAM installed, Windows is only able to report a portion of the physical 4GB of RAM (ranges from ~2.75GB to 3.5GB depending on the devices installed, motherboard's chipset & BIOS). "
Read more....
TabBlogger : The 3GB-not-4GB RAM problem

Hope this helps explain the memory issue for you.:)

Here's the answer. ASUS P5B has a memory mapping feature. Mine was disabled for some reason. When I enabled it, I now see all 4GB of RAM in Windows. That's really weird but I'm glad he found this!

Very good. I am glad you got it sorted out.

This does sound like a chunk of RAM mapped to his display adapter but a whole gig??

Seems a bit too large of a block for even a crappy card?

Ive still got THE SAME PROBLEM WITH MY UPGRADED PC. Windows 7 Professional 64bit (Upgraded from Windows XP Home 32bit). 4096MB Centon PC3200 Dual Channel DDR Memory (3-3-3-8) (4x1GB) (Upgraded from 2x256MB Dual Channel DDR) installed on an MS-7093 motherboard (RS-480M2-IL) with an AMD Athlon 64 3200+ 512MB L2 Cache that has an integrated ATI Radeon Xpress 200 chipset and integrated SB400 (AC97') audio chipset. Ive recently installed a Galaxy NVidia powered GeForce GT430 with 1024DDR3 onboard memory. Pretty sure the ATI Radeon Xpress 200 was uninstalled (not in device manager). And I dont know how to optimally set my BIOS options. Phoenix AWARD 6.00 PG (No updates from MSIs Live Update, and the one from Emachines worked, but I saw no changes). My Memory Installed: 4GB (3.12GB Usable), 4GB reading in CPUIDs CPUZ at 199MHz as Dual Channel DDR (but at a timing of 3-4-2-8 {after switching latency in BIOS from 2.5-3}), Street Fighter 4 Benchmark reading 6256, AV. 34 FPS, memory:3198, video memory:1024, and Im pretty sure my BIOS also reads 3275776K Total Memory..... WHY?!
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