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Only half my memory being used
Hey guys, I just upgraded my mainboard (and processor/memory etc) due to my old mainboard having a its SATA2 controller fried. So I set out to go and buy some of this new stuff and I ended up with:
ASRock P55 pro mainboard
QuadCore Intel i5 750
4GB of ram (2x 2GB)
Now obviously this is dual channel memory so I used the A1 and B1 banks (as suggested by ASRock's manual), and I also have Windows 7 64-bit. Now the thing is. Windows 7 reports that only 1.99 GB of the 4 GB can be used. Lavalys Everest tells me a similar story:
My bios also report that I have 2x 2 GB of memory in there and a run of DXdiag also shows 4gigs.Code:Motherboard: CPU Type QuadCore Intel Core i5 750, 3033 MHz (23 x 132) Motherboard Name ASRock P55 Pro (2 PCI, 2 PCI-E x1, 2 PCI-E x16, 4 DDR3 DIMM, Audio, Gigabit LAN, IEEE-1394) Motherboard Chipset Intel Ibex Peak P55, Intel Lynnfield System Memory 2039 MB (DDR3-1333 DDR3 SDRAM) DIMM1: RMB2GB484CA6-13HC 2 GB DDR3-1333 DDR3 SDRAM (9-9-9-24 @ 666 MHz) (8-8-8-22 @ 592 MHz) (7-7-7-19 @ 518 MHz) (6-6-6-16 @ 444 MHz) DIMM3: RMB2GB484CA6-13HC 2 GB DDR3-1333 DDR3 SDRAM (9-9-9-24 @ 666 MHz) (8-8-8-22 @ 592 MHz) (7-7-7-19 @ 518 MHz) (6-6-6-16 @ 444 MHz) BIOS Type AMI (08/05/09) Communication Port Communications Port (COM1)
Does anyone have any idea on how to fix this? Or is this normal behaviour?
[edit]
I changed my memory around to use slots 1 and 2 instead of 1 and 3 and now it uses 4 GB, but it's (obviously?) single channel mode. My question still stands though is it usual for windows 7 in dual channel mode to 'only' use half of the memory available? Also I noticed that the bios registered the memory, but during POST it only showed 2GB before. Right now it's 4 GB. The problem isn't 'solved' yet though, I'd like to use the dual channel capabilities :).
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Last edited by BadGuy; 18 Oct 2009 at 05:02. Reason: experimenting