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khaidir77

macrumors member
Original poster
Jan 25, 2016
41
4
KUALA LUMPUR
Which RAM is suitable? 1866 MHz or 2133 MHz DDR3L?
Hi there,

I got these 2 pairs of RAM:

  • 1866MHz DDR3L - 8 GB x 2 Kingston HyperX Impact Black
  • 2133 MHz DDR3L - 8 GB x 2 G.Skill RipJaw
Can someone tell me which one is suitable for my system: MacBook Pro 15" 2.6GHz i7 (Mid 2012)?

Also running with two 2TB Samsung 850 EVO SSD in a RAID 0 setup.
 

DeltaMac

macrumors G5
Jul 30, 2003
13,751
4,577
Delaware
If you must use out-of-spec RAM, then the Kingston would be a better choice between the two. (Not your best choice, imho, as I have had "challenges" with Kingston RAM in the past
Better, in my opinion, would be to use the specs that Apple calls for: DDR3-1600MHz 204 PIN SODIMM
DataMemorySystems has great support for the Mac.
https://www.datamemorysystems.com/a...2-6ghz-15-md104ll/a-mid-2012-memory-upgrades/
(Good prices, too...)
 

Patcell

macrumors 6502a
Aug 8, 2016
634
302
Bergen County, NJ
As mentioned, your best option is to stick with the original spec (1600mhz DDR3). Putting in higher clock RAM than supported will at best under-clock to 1600mhz, and at worst crash the system.
 
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