About dual and 3 channel RAM

April 12, 2009 at 19:02:15
Specs: Debian Etch, Athlon64 X2/4G
Hi folks,

There are 3 channel DDR-3 RAM kits available on market. Would its performance be better than dual channel RAM kit, apart from RAM capacity?

I'm planning to build a new box testing server consolidation on virtualizaion running Xen/Vserver/OpenVZ as software. All servers running 64bit Linux OS.

My new planning is to get 2 sets DDR-3 1333/1600 4Gx2 kit. I may consider 3 channel kit dropping the total RAM capacity to 6G if it has better performance. Please shed me some light. TIA

Besides can mobo support dual channel RAM also allowing 3 channel RAM to work on it without sacrifying performance?


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April 12, 2009 at 19:43:04
Triple-channel RAM doesn't give desktop applications much of a boost (around 5% is what I've read). However, servers that can take advantage of additional memory bandwidth should receive a much larger increase in performance.

I'd go with the triple-channel/6GB setup, then upgrade to 12GB later on.

Yes, Core i7/Xeon motherboards that support triple-channel memory can also run in dual-channel (and even single-channel) mode.

Pentium M oc'ed to 2.82GHz, 667FSB, 2MB L2
3GB of DDR-800 @ 667MHz
GeForce 9600GT
Modified PowerMac G4 'Quicksilver' case
HDMI to homebuilt 1080p projector

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April 12, 2009 at 20:57:21
Hi jackbomb,

Thanks for your advice.

Unless getting a server mobo there will be no spare slots taking further 3 ram sticks. I'll build this new box for testing purpose NOT for production. Therefore I won't purchase a server mobo for its use.

I'll keep your advice for building production server. Thanks


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