So I got a laptop a couple weeks ago that has an A8 4500m and a Radeon 7640g GPU.
It came with 1 SoDimm 4 Gigs running at 1600 mhz.
I know dual channel is very important for GPUs that share system memory, so even though it is slower I put in another SoDimm I had laying around running at 1333 mhz.
Sure enough even tho my memory speed went down with dual channel and the lower CAS I got a NICE boost in performance.
So my question is this.
Right now I am running at 1333 mhz CAS9. The 1600mhz stick this laptop came with is rated for CAS11 @ 1600 mhz.
I was thinking of getting another 1600 mhz stick to replace the 1333mhz stick I am using........but I am worried if they both are running @ CAS11 vs CAS9 then the performance difference will be negligable.
So then I will be in the position where instead of having to buy 1 more stick I might need to buy 2 both at at least CAS9.
How much of a difference does CAS latency make vs the mhz rating?