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you can check the compatibility at<br />
<br />
<a href="http://www.crucial.com" rel="ugc">www.crucial.com</a><br />
<a href="http://www.kingston.com" rel="ugc">www.kingston.com</a><br />
<br />
but i think your mobo is just picky about them
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you can check the compatibility at

www.crucial.com [http://www.crucial.com]
www.kingston.com [http://www.kingston.com]

but i think your mobo is just picky about them

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I agree - in most cases, you can mix different speed RAM, but some motherboards just don't like it.
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I agree - in most cases, you can mix different speed RAM, but some motherboards just don't like it.

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I am running a MSI K7T266 Pro2 Motherboard (MS-6380) with 512mb or Crucial Memory # CT6464Z265 with the following stats - DDR PC2100 - UNBUFFERED - NON-ECC - DDR266 - Voltage: 2.5V - Memory Timings:CL=2.5.<br />
I am trying to add a second 512mb module. &nbsp;I found a great deal at TigerDirect on the following Ultra brand memory - DDR PC3200 - 400mh &nbsp;- (I apologize, but no other stats are available...)<br />
I can install either memory module into my PC and it will work properly. &nbsp;I can do this in any of the three Memory Slots on the Motherboard. &nbsp;When I install both together, the PC only sees 512mb of memory. &nbsp;I have tried upgrading the BIOS, changing the BIOS settings, swapping the slots several times and everything else that I can think of. &nbsp;<br />
Can I mix these two types of memory in a PC? &nbsp;From what I have read, I should be able to do this, but it seems that I can not. &nbsp;Any suggestions?<br />
<br />
Thanks,<br />
<br />
Christopher<br />

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I am running a MSI K7T266 Pro2 Motherboard (MS-6380) with 512mb or Crucial Memory # CT6464Z265 with the following stats - DDR PC2100 - UNBUFFERED - NON-ECC - DDR266 - Voltage: 2.5V - Memory Timings:CL=2.5.
I am trying to add a second 512mb module.  I found a great deal at TigerDirect on the following Ultra brand memory - DDR PC3200 - 400mh  - (I apologize, but no other stats are available...)
I can install either memory module into my PC and it will work properly.  I can do this in any of the three Memory Slots on the Motherboard.  When I install both together, the PC only sees 512mb of memory.  I have tried upgrading the BIOS, changing the BIOS settings, swapping the slots several times and everything else that I can think of.  
Can I mix these two types of memory in a PC?  From what I have read, I should be able to do this, but it seems that I can not.  Any suggestions?

Thanks,

Christopher


Mixing different speed memory modules

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.