Quote Originally Posted by ChaosAD View Post
Post screen and bios report 4gb. Will memtest be any different? If i remember correctly lowgap is set to the lowest 2k setting? (Does lowgap has any impact on performance, what the use of it?)

But the fact that one out of three sticks cant load windows and stuck and CF is not enough evidence thats its dead?
lowgap also influences how much memory windows sees as available

Memory LowGap: is for mapping local memory (add-on-cards) to system memory address size. It most like AGP port Aperture size or PCIE1gen 250M fixed mapping size. Extend it can solve when if "add-on cards" request a bigger size as like we would like to enable Qual SLI on NV new 295, it must be extend over 2048M. Can confirm that with 2x HD4870x2 in Crossfire I had set my LowGap to around 2176 at least. With Highpoint 3520LF PCI-E x8 256MB cache controller added into HD4870x2 Crossfire, I needed at least LowGap of 2560 otherwise windows boots to a blank window and doesn't go any further. As to how this effects windows available memory, with single HD4870x2 installed and 3x1GB memory, if I set LowGap to 2560, WinXP Pro SP3 32bit sees 1.5GB available memory. If I set LowGap to 1024, WinXP Pro SP3 32bit sees 3.0GB available memory IIRC.
but memtest should still see 6GB for testing so you have probably a separate issue in a faulty module