Im getting a 676 in cinebench with:
i7-4790k w/ kraken x61 (25c idle 60c under load) None oc'd.
msi gaming 5 mobo
16gb ddr3 2400hz ram
gtx 980 sc acx 2.0
evga 850w gold rated psu
Whenever i run the test the pc will freeze (black screen) for anything from 5-30 seconds. Then it will recover. I'm thinking this is GPU related? But really makes no sense what so ever, have xperience brown screen crashes before with my gpu and have also struggled OCing the CPU as it crashes on anything over 4.2ghz overclocked with a blue screen. And yes, it also does this in stock settings with turbo boost from time to time. One stage i had it under clocked to 4ghz fixed. Didn't have problems then with blue screen crashes.