Overclocking Neophyte looking for some answers

Ok, I started to look into OCing.

For the hell of it I did a two hour stress test with Prime95 with only the multiplier manipulated to 45. After two hours I had no errors but my core temps got a bit high: 70c, 75c, 78c, 74c. According to EasyTuner (Gigabyte App) my Vcore at X45 was .8V-.9V at idle and at 1.308 or 1.320 (mostly the latter) during the stress test.

So my temps are a bit high, so will lowering the Vcore lower my temps?

My BIOS does not allow me to manually set the Vcore but I can use the Dyanamic Vcore (DVID) to increase or decrease the Vcore, so could I lower my temps by manipulating the Vcore with DVID?

Thanks,

Kiyamon

CPU: Intel i5 2500k
Motherboard And BIOS Version: GIGABYTE GA-Z68A-D3H-B3; F11 BIOS
Memory: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory
Power Supply: CORSAIR Enthusiast Series CMPSU-650TX 650W ATX12V / EPS12V SLI Ready 80 PLUS Certified Active PFC
Graphics: EVGA SuperClocked GeForce GTX 560 Ti (Fermi) 1GB
Case And Cooling: Rozwell Challenger midtower, COOLER MASTER Hyper 212+
O/S And Misc Stuff: Windows 7 - Pro 64