That gray stripe is the thermal compound. After you install the cooler it will 'melt' and flow to where it's needed.
If you wanted to add after market thermal compound you'd need to clean off that gray compound on the heat sink and then apply the new thermal compound to the CPU according to the application instructions.
I recommend buying an aftermarket heatsink / fan if you are gonna do any OC'ing.
Of course you can try simply using the default HSF, just monitor your temps. If too high, then lower your OC. If still too high, then buy a new HSF.
July 6, 2010 11:56:08 AM
Yup, TIM already in place on stock cooler, but honestly, £5 to replace stock TIM is worth it, so is replacing the Stock Cooler with a decent aftermarket solution, for cooler quieter running especially if you wish to OC..