4GB of PC3-12800s vs 8GB pc3-10600s in a MacBook Pro

[h4lp m3]

I have a MacBookPro9,1 and it came with (2) 2GB sticks of PC3-12800 for a total of 4GB.
My friend gave me an 8GB kit of pc3-10600s and I installed it and it works!

So my question is: Will 8GB of 10600s give me better performance than 4GB of 12800s?

 

[simonsi]

So my question is: Will 8GB of 10600s give me better performance than 4GB of 12800s?

Only if you need >4GB...what does you RAM pressure graph in the Activity Monitor show?

If you do <need> >4GB then 8GB of <slower> will be better than 4GB of <faster>

 

[cycledance]

8gb will definitely make a much bigger impact on performance.

for best performance get 2 x 8gb 204-pin PC3-12800 (1600 MHz) CL9 DDR3 SO-DIMM

yes, your mbp supports 16gb ram.