With both sticks the memory is in dual channel mode and things are moving along at great speed. This can push instable broken systems to failure.
Try this. Be sure the BIOS is the latest, not overclocked, load the BIOS defaults and re-test.
After that, let's see what MAKE AND MODEL PSU was used and a Web Speccy to see if there is anything odd going on.
Hello. I recently purchased a cyber power pc, it's a windows 10 64 bit system, with 8 gigs of ram. The computer would randomly crash right out of the box. I should have returned it, but I didn't. It doesn't give me any error messages or anything, or warnings, it will just randomly restart. On occasion after a restart it will go into a windows auto repair loop that's only fixable by unplugging the computer. I've tried re installing windows, updating all my drivers etc. the company hasn't been much help. The only thing that will fix the random crash problem is removing one of the ram sticks. It runs fine on one stick. So I thought one of my ram sticks was bad. Replaced them with two new sticks and the crashing problem returned. Removed one stick and again it is crash free. Any help would be appreciated it.