I have a problem on Intel DQ77KB board. I use Coreboot with FSP and Seabios as a payload. I have two the same boards and on every board Memtest86 reports a problem at 2990.8MB. That problem occur only if I use 4 or 8GB memory. With 2GB memory everything is OK.

What may be causing errors in Test2 "Address test, own address, Parallel"  in Memtest86?
http://www.memtest86.com/technical.htm

Chris