Benchmarking?

[DEL 707]

This is the spec of my machine.

Intel Core i7 930 2.80GHz (Bloomfield) clocked at 4Ghz
Asus P6X58D-E Intel X58
Corsair XMS3 12GB (6x2GB) DDR3 PC3-12800C9 1600MHz
Antec 902 Nine Hundred Two (V3) Ultimate Gaming Case
Noctua NH-D14 Dual Radiator CPU Cooler
Sapphire Pure 625W Modular Power Supply
EVGA GeForce GTX 970 SC ACX 2.0 4096MB GDDR5 PCI-Express Graphics Card
XFX XTR 750W '80 Plus Gold' Fully Modular Power Supply
Samsung 1.0TB 850 EVO SSD 2.5" SATA 6Gbps 32 Layer 3D V-NAND Solid State Drive

While gaming I've noticed a perfomance drop, mainly in Vermintide, but last night I played Company of Heroes and about 30 min into the game, it ran like crap.

What's the best way to make sure my machine is giving the performance it should? Should I run a benchmark, if so which 1? Is there a way to compare benchmarks with my computer? Because even if it does give a score, I'd have no idea what it means.

 

[DEL 707]

Well just tried a game of Vermin.

Max CPU temp 68°C.
Max GPU temp 72°C.

I don't have my GPU overclocked in anyway.

 

[DEL 707]

I think CoH plays up more then longer it's on is because of map damage and bodies/vehicles. I just played a game with some mates on slightly lowered settings, was set by the game before and it seemed to run better.

I did a First Strike demo benchmark and got a score of 9776.
http://www.3dmark.com/fs/8092328

So yeah, good or bad, I'm not sure.