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Is DDR333 working on DDR400 motherboard?

Last response: in Memory
February 28, 2005 8:17:34 AM


Did any one know can I use my DDR333 memory into a DDR400 motherboard?

February 28, 2005 10:21:08 PM

It will probably work for a CPU that runs at 333Mhz.
Nforce 2 boards are picky about brands too so the brand might matter.

Your question is a little bit too general.
What do u want to do?
What processor do you want to use?
What FSB do you want to run at?
What is your brand of memory?

The loving are the daring!
March 1, 2005 8:02:11 AM

DDR400 Motherboards do not necessarily have to have DDR400 RAM, DDR400 RAM is simply the maximum speed they support. Most boards will allow you to use a RAM/FSB divider which sets your FSB and RAM and different speeds. Or you might be using a 333Mhz FSB CPU in which case you can keep a 1:1 ratio of FSB to RAM.
As Flinx said we really need more information to be helpfull.
a b } Memory
a b V Motherboard
March 1, 2005 6:01:14 PM

All DDR400 boards support DDR333 as well. In fact, with certain CPU's, you can't even run DDR400 at full speed.

The key is what CPU you use. If you have a 400 bus Athlon, an Athlon 64, or 800 bus P4, running slower than DDR400 RAM will result in decreased performance as the system will use a lower ratio for the RAM, with RAM running at 4/5 or 5/6 its normal speed.

With slower CPU's like the 533 bus P4, some chipsets will only allow a maximum speed of DDR333 anyway, even on a board that supports DDR400. So DDR400 would be clocked down.

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