My M/B has been working fine for the last few months with 8GB (4 x 2 GB of 1600MHz. Kingston Hyper X RAM) DDR3.
Then Saturday, it went bottoms up, it started to only recognize 4GB, then this dropped to 2GB.
I pulled the RAM, and started checking it out.
Normally, you should be able to boot from slot A1 or B1, however, not one of the 4 sticks will boot from A1. Multiple beeps and will not POST)
So, I stuck each stick into DIMM B1, every stick is detected and boots up fine as a single stick in the B1 slot. So far so good. (2GB at single channel speed)
If I add a stick to DIMM A1, nothing is detected, but it still boots showing only the 2GB stick in B1.
Like I say, there seems to be nothing wrong with the RAM as they all boot individually in B1.
I have already called ASUS to try and RMA the board.....but they are so sloooooooow!
So today, I stuck various combinations of the 4 sticks into various slots.
If I stick 2 sticks into B1 and B2, I get a clean boot, and 4GB recognized, however it is running in single channel mode, (Which ASUS say does not work!!!!)
If I try an additional 2GB in slot A2, (B1,B2,A2) I still get a clean boot, but still only 4GB recognized in single channel mode.
If I try 2GB in A1, (i.e. A1, B1, B2) I still get only 4GB single channel.
If I stick all four sticks in - I go back to a clean boot, but only 2GB recognised - tell me ....this really is pointing to something wrong with slot A1!
It has been driving me round the twist!
If it is the board, I will RMA it, but looking at the way ASUS handle RMA's, I think I will plumb for a Gigabyte GA-P55-UD6 and sell the damn ASUS when, if they ever return it.
Any ideas?