Re: DDR II Memory compatibility
- From: "RobV" <robv@xxxxxxxxxxxxxxx>
- Date: Thu, 6 Dec 2007 17:15:40 -0500
On Dec 5, 11:24 pm, Paul <nos...@xxxxxxxxxx> wrote:
I have a laptop with memory specs : DDR II PC3200 400 Mhz
Can I put other DDR II type with upper frequency (eg PC 53000 or
other) ? will it work ?
Faster memory is compatible with slower applications. If the
laptop uses DDR2-400, you could use DDR2-533 or DDR2-667 in
You can confirm the options for your laptop, by visiting
crucial.com or kingston.com and searching for your laptop
there. They will normally show a whole range of memory
modules that would work, with some of them being much
faster than they need to be. Because the speed is backward
compatible, the faster ones can be used in place of a slower
To get the "PC2" number, you multiply the DDR2 number by 8.
So DDR2-667 becomes PC2-5300. The marketing people like numbers
with zeros on the end, as they're easier to remember.
What if I have the motherboard that takes DDR400 PC3200 only can I put
533 Mhz memory in it?
DDR400 PC3200 memory is the last SDRAM memory that was around when DDR2
memory came around, and that's already giving way to DDR3 memory.
I don't think the memory you have is DDR2, as PC3200 runs at 400 MHz
(effective). With two DDR PC3200 memory modules installed, some MBs
will run in Dual Channel mode, which grabs more bits per cycle than
single channel, which speeds up memory transfers.
The point is, none of these are interchangable. Installing faster
memory alone will not change anything unless the CPU and/or memory
busses can run faster to take advantage of it.
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