Will Arctic Silver 5 work with C2D stock cooling or it will be a waste?

The PSU Is a 800W just mistaked typing :)*

My Rig:

Intel Core 2 Duo E6600, 1066Mhz, s775, 4MB Cache 

ABIT IB9 s775 Conroe, Intel P965, DDRII 800, PCI-E

DDR II 800 3GB TwinMOS CL5

2x:ASUS 8800GTS 640MB GDDR3, HDTV, 2xDVI, PCI-E In SLI

Western Digital 250GB 7200RPM, 16MB Cache, SATA II

LG DVD±RW GSA-H42NK x18 Black

Zalman Hard Disk Fan

Arctic Cooling 2xArcticFan 12cm  (+The case has a 25CM yeah you heard right 25CM fan on the side-pannel)

CASE: Enermax Chakra ECA-3052BL Black/Blue

PSU: SpireRockeTeer VI 600W EZ-Cable Silent (24pin)

Is this one gonna be better then stock?:

http://ksp.co.il/hmain.php?uin=2424

i'am buying the C2D E6600.