2009 Mac Pro RAM compatable with PC?

Hi, I recently built a PC around the MSI Z87-G41 Motherboard. Here are the specs for the full computer;

-Intel i5 4670K @ 4.2 ghz
-Cooler Master Hyper 212 EVO cooler
-nVidia EVGA GTX 660 SC edition
-8GB Crucial BallistX DDR3-1866 RAM
-Seagate Barracuda 500GB HDD

My Dad, who is a studio producer, currently has a 2009 Mac Pro 8-core with 16GB of DDR3-1066 RAM. Because of renewed funds and a much larger workload for his computer to handle, he is now upgrading his ram from 16GB to 32GB. This means we will have all of these 2GB RAM sticks just laying around. Could I possibly utilize two of these sticks by sticking them into my mobo and bumping up my RAM capacity?
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  1. Best answer
    If you go that route, your current memory will be knocked down to the lower data rate of 1066, and that is if such different sticks didn't cause the machine to crash or fail to post all together.
  2. It should be compatible but using 1066MHz sticks with 1866MHz sticks will underclock the faster ones to 1066MHz
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