Horrible benchmarks & glitching with gtx 960 PLZ HELP!

[Double D PC]

so i just finished a build here is what is in the build:
1) nvidia gtx 960 2gb
2) 1tb 7200rpm sata lll 6gb hdd
3) i5 2400
4) 8gb corsair vengeance 1600Mhz ram
5) Asus P8H61-M LE/CSM mobo
6) zalman cpu air cooler
This is what im experiencing, after every build i do i run a benchmark test with heavens, my test on this build is glitching from the start and i get a 585 score with a high of 35 fps, this is a problem, this tells me something is wrong, i did a fresh install of windows, everything is updated, windows tells me the gpu and cpu is working fine, i swapped the cpu out to another and the same thing, the score should be around 1500 on heavens for this system. Im completely stumped, ive read as many forums as i can find and nothing to explain my issue. is this particular card not compatible with win 10 maybe? any suggestions would be great! thanks in advance

 

[RaDiKaL_]

Assuming you've installed all the latest drivers for the mobo as well as for the GPU, I have the following questions:

- Which PSU do you have?

- Have you made sure the extra PCI-E power connector is properly plugged into the GPU?

- During the benchmark tests, what was the CPU and GPU usage %, their temps and their frequencies?