My second guess (in my case) is my GPU card that's just too old (nVidia G100). Looks like the fan rotation is very slow, I guess it overheats & makes the computer reset. Is that possible, do you think? Computer itself has 16G RAM + Intel Xeon E31270 @ 3.40GHz, 500W PSU (quite enough I guess).It was GA-Z77M-D3H, "refurb" I got direct from China. . No wifi (ethernet everywhere!). I also have a atx GA-Z77X-D3H purchased new and it runs like a champ with all four memory slots occupied with fastest-supported xmp memory.
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Nice board but I prefer to ignore the onboard ethernet ports and always add a dual-port Intel Pro 1G ethernet card.Had no such problems before I replaced the CPU and GPU
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