Question 1

Is this compatible with a Lenovo ThinkCentre M81?

Accepted Answer

Yes. Your computer supports these kinds of RAM:

UDIMM, PC3-10600 1333MHz DDR3, four UDIMM slots

(source: Newegg prevents me from posting the URL, but if you Google search "Lenovo ThinkCentre M81 RAM specs" you should find a page with a URL ending in "pd013522")

Question 2

if I add this stick to my motherboard along with the exiting 4 g stick will it double my memory to 8 gigs of ram? or would I have to change anything; or can you just put it in and go

Accepted Answer

I used this RAM on a older HP PC P2-1033. RAM was compatible per Kingston with the PC. The Kingston is not as tall as the original 2GB that came with the PC but works .It now has 6gb that helped speed up the pc a little. Just make sure it is compatible with your motherboard and if so will work fine.

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