Posted 22 April 2005 - 12:30 AM
The cards have been made to conform to standards.
64, 128, 256, 512, 1024 are standards,
and the combination of them does equal the total.
One 512MB card = two 256MB cards, yes.
If you have 3 DIMM slots, it's feasible you could install a 512MB, and have the two 128MB cards also = 768MB RAM.
hays47's advice is good.
Motherboard specifications can simply demand
specific designs of the RAM cards that will work.
Each specification is important.
Any two cards should be matched, as a practical consideration,
one that trial & error has proven to be significant, as often as not, to making good
Also some boards (if not most) seem to perform best with the largest
RAM closet physically to the processor, when determining where each stick should go.
so, take the 128's out, install the 512 by itself (if it checks out to be the right kind, based on those motherboard requirements) in the slot closet to the processor.
If thats a sucess, then try adding the matched pair of 128's in the remaing slots, and give that a try.
Let us know what you find out, and post more details of the exact parts involved if you like. makes, models & numbers ... that sorta thing.
We await your next post.
patiently patrolling, plenty of persisant pests n' problems ...