I have just purchased 2* 1gb ram sticks to upgrade from 2gb to 4gb. The ram is:
Samsung Original DDR - 400MHz, 2GB (1024MB), PC3200, DIMM, Non-ECC RAM Random Access Memory, CL3, Desktop 2 x 1 gig sticks
It is made by samsung and i purchased this specifically as it is exactly the same as the ram i currently have (at least i think). Basically when i add it to my 2 current sticks to make up 4 1gig stick windows will not start. It either blue screens after it gets to the desktop and says there is a problem with 'MEMORY MODULE' i think or it says it is shutting down to prevent damage in a black screen early in the startup. When i turn it on with all sticks in it does a memory check and says 3'xxxxxxxx bytes OK' - it should be '4xxxxxxx' for a start as it is 4gig.
I have run the computer with just the new sticks in and it runs fine - however i tried it with just 2 sticks in the 'secondary slots' (the 2 slots that were previously empty) and it boots up fine - however CPU-Z tells me that the timings are all different. Normally it is 'Freq: 201Mhz' when there is RAM in the 2 first slots, but when i run it in the second two slots it varys between '157.9' and '158.0' Mhz.
Any ideas? Why would the same ram run at different speeds in different slots?
Any help much appreciated - Thanks