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I have an iMac that shipped with 16GB RAM (using 2 out of 4 slots). I ordered two 16GB RAM modules from OWC. Instead of just replacing the RAM, can I actually add the OWC RAM to what's already in there? Will this cause problems, mixing the two brands?

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Yes it will work, although it's always better to have the same latency and MHz kits.

  • It should work, IF your Mac supports 48GB of RAM. Some do some don't best to check the specs on Apple.com to see. But putting them in to see shouldn't cause any issues. – Steve Chambers Jul 20 '16 at 12:58
  • I think he means: "Could I just bought 1x 16gb module to add to my existing 16gb to get 32gb?". So he wouldn't need to replace his current 16gb with OWC module. I might be wrong.. – emotality Jul 20 '16 at 17:33

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