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can you use DDR1 with DDR2?

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ashenfang

The Jet Man!
Joined
Feb 25, 2003
Location
Indiana
Well heres the deal. I currently have 2x512 PC4200 DDR2 corsair ram. I would like to add (possibly from the forum classifieds) another 2x512 PC3200 DDR1 corsair xms ram...would this be a problem? Anything else I should know? It will be for system below.
 
The notch is also in a different place between DDR and DDR2 so that also wont allow you to put the DIMM into the wrong Socket.
 
Are there hybrid boards around that have both sockets? I recall seeing some pictures of them like, a year ago. That'd be a more interesting thing.
 
This sounds like running SDR and DDR at the same time; it just wont work with consumer chipsets. Different voltages, different signaling, different pin-outs, different clock speeds, different latency... it is probably too expensive to build a board that can support both.

A board that can support both at the same time would probably have two northbridges. That would be a sight :D .
 
There are a half dozen or so boards that will take either DIMM module. This Asus for instance. There is only one northbridge though and most likely a jumper to tell the board which type of DIMM is installed.

http://www.newegg.com/Product/Product.asp?Item=N82E16813131587

Most crossover boards of this type are aimed at upgraders who don't want to buy all new everything so they keep their old memory. A similar market is for those who want to keep their old AGP card so they get a board with both AGP and PCI-e 16x slots.
 
I aquired an ECS board from the classies with a 930D a couple weeks ago, and the board is AGP and allows both DDR1 and 2. You can only use one or the other but not both at the same time.
 
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