Installing dual channel memory in W520

[udvranto]

I am planning to populate all 4 slots of memory with 4GB each. A pair of the memory cards I bought are 'dual channel kit'. The question is where to put these two so that the pair works as a dual channel memory?

From the manual it is not really clear which one is which slot. I am guessing, the slots under the keyboard are termed as SLOT 0 a (top) and SLOT 0 b (bottom). Similarly the bottom ones are SLOT 2 a (left) and SLOT 2 b (right).

From the official W510 video, it looks like SLOT 0a and SLOT 2a are primary modules and SLOT 0b and SLOT 2b are secondary modules. In video these are termed as 1 & 3 under the keyboard and 3 & 4 bottom.

Does the pair goes to the SLOT 0a & SLOT 0b? That is the place under the keyboard.

Or does the pair go to SLOT 0a & SLOT 2a? One on top one on the bottom, but both in the primary channel.

W520 hardware maintenance manual :
http://download.lenovo.com/ibmdl/pub/pc ... 078_03.pdf

Here is a video doing the same on a W510:
http://www-307.ibm.com/pc/support/site. ... MIGR-74879
Another one
http://www.youtube.com/watch?v=RBEzYombu2c

[udvranto]

From the Lenovo forum wditters pointed out the following link:
http://forums.lenovo.com/t5/W-Series-Th ... a-p/249257