went on to Crucial.com and done the test for how much RAM and what type my computer will support it told me i can support up to 2GB in each slot and will hold a maximum of 8GB, but reading the manual for the dell dimension 5100 it states that my computer only holds up to 1GB a slot and a maximum of 4GB would like to know if crucial is just wrong or if my computer can hold more than the manual states? thanksWhat is this computer? (Manufacturer and Model Number)ive had a look and i cant find it, where should i check (sorry BOUT the STUPID questions)Laptop or Desktop?

Desktop: Should be somewhere on the front.
Laptop: Somewhere NEXT to the keyboard.desktop, and i did check there but this is all the information it gives me, and i didnt think this was what you where looking for "dell dimension 5100, intel pentium 4 processor", i could send you all the memory details thoughType 400-MHz and 533-MHz DDR2 unbuffered SDRAM
Memory connectors four
Memory capacities 256 MB, 512 MB, or 1 GB non-ECC
Minimum memory 256 MB
Maximum memory 4 GB


hope that helps As you said, Dell's manual for your computer says 4 modules x 1 GB each.

Trust Dell, not Crucial.

ADDITIONALLY, you didn't specify what OS you have, but, a 32 bit OS (which is what you most likely have) cannot access more than ≈3.5 GB, anyway, regardless of how much memory will fit onto the motherboard.ok thanks