Manual says this pair of 1GB sticks is limited to a single pair (i.e. 2GB limit to RAM installed), leaving 2 RAM slots empty. (Page 2-13 of manual, or on Asus QVL document). In fact, NONE of the low latency ram is approved for more than 2 slots.
I had put in a ticket to Asus about this problem... Their reply is below:
"4 stick will not work and there is no BIOS update that will change RAM compatibility.
Sincerely,
Jon V.
ASUS Technical Support"
I'm now effectively limited to 2GB of RAM. :(
Didn't want to chance it.
Review. Page 4.