Re: RAM Question
- From: manny@xxxxxxxxxx
- Date: 20 May 2006 13:52:17 -0700
Patty wrote:
My daughter just purchased a couple sticks of RAM for
a computer that currently is using PC-2100 DDR-RAM.
The guy at the computer store sells her 2 sticks of
PC-133 SDRAM and tells her they're the same thing,
but the PC-133 will just run a little slower. I thought
they were two different things and will the PC-133
SDRAM run in a system that takes PC-2100
DDR-RAM? Wouldn't she be better off buying a faster
speed of DDR-RAM and using it instead of the PC-133
if she can't find PC-2100 RAM? The computer in
question is a Dell, but I don't know the model #, just
that it came with PC-2100 RAM.
SDR (PC133, PC100, etc.) and DDR (PC2100, PC2700,
etc.) are not compatible with one another, electrically
(SDR uses 3.3V, DDR 2.5V) or mechanically (SDR has
2 notches in the edge connector, DDR only 1), but a few
motherboards can use both types (not simultaneously -
that voltage difference is why) and will have memory slots
of different colors (normally black for SDR, blue for DDR).
The difference in speed will be very small due to the CPU's
L2 cache handling almost all memory accesses.
.
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