I've got an Asus P5B-E Plus mother board and have been running 2gb of Cosair memory with 5-5-5-12 latency.
Today I upgraded by adding more Cosair, two 2gb modules whos latency turns out to be 5-5-5-18. All are non ECC DDR2.
I was thinking that the different latency would be the cause of my issue, but I'm not so sure.
Windows doesn't show any more than 2.93Gb with all installed. So thinking that latency may be the issue, I removed the 1Gb modules, leaving only the 2Gb modules, installed in the primary slots.
Still, Windows only shows 2.93Gb. The bios shows just over 3Gb and with all installed, the system bios shows just over 5Gb installed.
The manual for the mother board says that a small amount over 3Gb will be allocated elsewhere. I'll quote the manual. 'If you install 1Gb memory modules, the system may detect less than 3Gb of total memory because of address space allocation for other critical functions.'
Now, on another paragraph, the manual says the following, 'You may install a maximum of 2Gb DIMMs on each slot, but only DD2-533 and DDR2-667 density modules are available for this operation'.
So, it may appear that for wanting an extra 4Gb, that I should have used 533 or 667, rather than the 800s that I purchased. The original 2Gb are 800s.
I should have read the manual before hand, but does anyone know a way around this without buying memory over again?