Gigabyte GA-990FXA-UD3 Memory issue

Monstersti35

Commendable
Jun 8, 2016
4
0
1,510
So i built this computer around 2 years ago with only 8 gbs of ram. (Kingston "Black") Memory which is not longer for sale. I just a few days ago bought a pny set (8GB) from bestbuy here: http://www.bestbuy.com/site/pny-xlr8-2-pack-4gb-pc3-14900-ddr3-udimm-desktop-memory-kit-black/5429115.p?id=1219650452870&skuId=5429115

Thinking it would be a nice upgrade, however it will not post with all 4 ram slots taken up, but will post with 3 taken up. Is this just a simple issue of them not being compatible or some other issue?

Mother board is revision 4 if that makes any difference.
 

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