Lenovo X61 Dual Channel

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z3wl · #1 Post by **z3wl** » Sat Oct 10, 2009 12:01 pm

I have 2Gb+512Mb installed on my X61. Does the dual channel work? I mean the speed 667 mhz should double right? It is necesary to have 2 memories with same speed, capacity and brand? I mean for example : 2*2 Gb Kingston DDR2 667 mhz. How does this work please explain.

j-dawg · #2 Post by **j-dawg** » Sat Oct 10, 2009 4:14 pm

I believe frequencies must be matched to the motherboard and the capacities must be identical.

ajkula66 · #3 Post by **ajkula66** » Sat Oct 10, 2009 7:06 pm

j-dawg wrote:

I believe frequencies must be matched to the motherboard and the capacities must be identical.

No. Both slots must be populated for dual channel to operate (and it will not double the speed BTW), but capacities need not be identical.

If you have matched capacities (1GB+1GB let's say) it will operate in the synchronous mode.

If you don't (512MB + 1GB let's say) it will operate at asynchronous mode.

The differences are not perceptible to any human being on this planet, I can guarantee that.

z3wl · #4 Post by **z3wl** » Sun Oct 11, 2009 5:40 am

thanks a lot man. then i quess i'll stick forever with my 2Gb+512Mb. There are no advantages to buy another 2 Gb and make 2*2Gb i quess.

adrianaitken · #5 Post by **adrianaitken** » Sun Oct 11, 2009 9:05 am

http://en.wikipedia.org/wiki/Dual-channel_architecture

basically you get 5-15% improvement *if* you have matching memory.

ajkula66 · #6 Post by **ajkula66** » Sun Oct 11, 2009 1:22 pm

z3wl wrote:

then i quess i'll stick forever with my 2Gb+512Mb. There are no advantages to buy another 2 Gb and make 2*2Gb i quess.

Well, since you do have a machine that can utilize 4GB RAM in a 64-bit OS-whether you're presently using one or not-and the DDR RAM is cheap, I'd get another 2GB stick somewhere down the road anyway, but that's me...

adrianaitken · #7 Post by **adrianaitken** » Mon Oct 12, 2009 3:10 am

If you install 4GB, you can use 3GB for XP and have a 1GB RAMdisk using the unused memory. I did this until I installed Windows 7 64 bit (and upgraded to 8GB). If you search for Gavotte in this forum I explained how to set it up (and the RAMdisk is free !!).

z3wl · #8 Post by **z3wl** » Wed Oct 14, 2009 4:50 pm

thank u for all advices. maybe i'm going to buy 2Gb after all and make 2*2 Gb

by the way...i've tested the single and dual channel on my X61 with Everest (the program that shows temperature on CPU, MB etc and makes tests for the stability and bookmark). There were no differences between the single and dual...the results were almost the same. I was a lil bit dissapointed

Lenovo X61 Dual Channel

Lenovo X61 Dual Channel

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