DDR400 and DDR333

lothario · 07-16-2006, 10:36 PM

I have 2 memory modules:

DDR400 128MB 16Mx16 2.5v UI
and
DDR333 128MB 16Mx16 2.5v UI

They have the same number of pins.
They look identical.
Except for the speed, which is 400 and 333.

The motherboard has 2 slots for memory modules.

Can I use both of modules on the same motherboard?

If yes, I assume they will both operate at 333. Correct?

HappyTux · 07-17-2006, 01:49 AM

Quote:

Originally Posted by lothario

I have 2 memory modules:

DDR400 128MB 16Mx16 2.5v UI
and
DDR333 128MB 16Mx16 2.5v UI

They have the same number of pins.
They look identical.
Except for the speed, which is 400 and 333.

The motherboard has 2 slots for memory modules.

Can I use both of modules on the same motherboard?

If yes, I assume they will both operate at 333. Correct?

Generally the answer will be yes they will work at 333 but it depends on how picky the motherboard is.

lothario · 07-17-2006, 01:52 AM

Ok Thanks.

J.W. · 07-17-2006, 02:00 AM

You probably can use them together, but as HappyTux explained, a chain is only as strong as its weakest link, and in this case, your memory speed will be 333 at best. Personally, I would not advise mixing different RAM sspeeds together (if you start to see random lockups or other instability, don't be too surprised) however it can be done

Chappy7777 · 07-17-2006, 12:35 PM

Hi, I just put a stick of 512mg DDR 400 in w/a stick of DDR 333. It is working fine, but as said, you will only get 333 out of the 400 stick. But the DDR is "backwards compatible".

Where you will almost w/100% certainty have trouble is if you try to mix double sided ram w/single sided. You likely know this, but I figured why not add it?