Please Help!! PC randomly restarts when ram is set to 1866.

Bad4Bizness84

Reputable
May 10, 2014
4
0
4,510
A10-5800k black edition 3.8 ghz
A88XM-e45 mobo
G Skill F3-1866C9D-8GAB DDR3 1866 Cl Timing 9-10-9-28 PC3 14900
2x4gb sticks installed in DIMM slots 1&3
Win 7 Pro 64 bit

This ram is rated at 1866, and the APU and mobo support 1866, but when I set the ram to 1866 in the bios it causes the computer to randomly restart. Sometimes it won't make it past windows screen, sometimes it lasts 10 minutes. Runs dependably without issue if I run it at 1600, but I have been editing video on Sony Vegas Pro 13, and my ram usage goes up to 98% so I thought the extra little boost may help. Plus I paid for 1866 so I would like to use it! I'm not extremely knowledgeable about computer systems, but I did build this pc and make it work, so I have some working knowledge. Any help would be appreciated!