Thanks Neil, but I'm a bit confuse here where if I mixed the memory at the
first pair with 5300 and 4200 memory it work fine, also the bios recognize
the memory. I just woder do I need to reinstall. I have tried all combination
and the system only recognize 1 Gig.

"Neil Harley" wrote:

Bec664 wrote:
I just bought a DELL E521 PC with 1 Gig ram DDR2 5300 , decided to add 1 Gig
more memory DDR2 4200 where from the old system, after install Vista boot up
slow and black screen. After removing it no problem. Tested the system only
run at 1 Gig, do I need to reinstall to recognise the ram.

Bec664

you need to install the same type of RAM.