nx8220: how many memory channel???

Hello to everyone,

May be you can help me about a ram upgrade I'm planning for my HP-Compac NX8220.
At the moment I have 2*256Mb=512Mb of ram, but i would like to increse to at least 1 Gb, my only question it's about the memory interface the 915PM chipset it's using, it's a bual channel memory so to keep the ram performance I have to upgrade both sodimm to 512*2=1gb, or it's a single channel memory so I could buy 1 gb in a single sodimm to make 1Gb+256=1.256 Mb??

Theoretically the chipset it's dual channel capable and at the moment Sisoft Sandra and CPU-Z shows that both channel are used in parallel, but HP's support wrote me that it's possible to use two different sodimm configuration with no problem, but they didn't say if this will disable the dual channel configuration.

Have you got any real information, experience, tips?

Thank you in advance for any help.

Bye.

WLK



P.S.: I'm sorry for my bad english.

 

It should support dual channel, but if you use two different sized RAMs you'll get single channel, I guess HP didn't tell you that. AFAIK, dual channel is not that important on a PM machine.
I'd go for 1 GB and use it with one of the old 256 MB, and later on buy another 1 GB if you want. Buying 2x512 MB is just waste of money, unless you're absolutely sure you'll never need more (Vista?).