I have a 64 W7 PC so can take as much RAM as I want (in theory) but my mobo doesn't seem to like it.
I have 2 x 2GB X Brand and 2 x 2GB Y Brand sticks in XYXY format (as colour coded on my board) but only the X brand are being shown in Windows, CPUz and the crucial scan.
I have CPUz which shows as single channel and 4GB but my mobo specs (https://www.cnet.com/products/hp-compaq-business-desktop-dc7800-core-2-quad-q6600-2-4-ghz-monitor-none-series/specs/) show 4 slots for 8GB memory.
the crucial scan doesn't show the 2 empty slots of RAM (should it?), only shows the 2 full slots.
Is there something up my with board or bios? I haven't updated the bios since I got the PC.