Overclocking the i5-2500K with Zalman CNPS10X Performa

NTxC

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Nov 18, 2011
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Machine:
CPU: Intel Core i5-2500K
CPU Cooler: Zalman CNPS10X Performa without the RC24P PWM-resistor
GPU: ASUS Radeon HD6970 DirectCU II 2GB
RAM: A-DATA 8GB 1333 MHz Gaming Series CL9
M/B: ASRock Z68 Extreme3 Gen3
PSU: XFX Core 550W

Hello,
I recently started overclocking my Core i5-2500K, right now I put the multiplier up to x41 and I've set Vcore in BIOS to Manual, 1.250V.
However when the CPU is on stress, CPU-Z reports a 1.160/1.168V voltage. I got Prime95 running for nearly 2 hours without problems and with max temperature of 49C, avg. about 47C. No BSODs, no crashes or freezes.

I'd like to hear expert's opinions on how I'm doing currently:
http://img339.imageshack.us/img339/7343/10588966.jpg

What would you recommend? Isn't the Vcore a bit low for such a high multiplier?