Super CPU 64 - a look inside at the Electronics - Commodore 64
MOS Technology 6510 - Wikipedia
Commodore 64 - Wikipedia
I've had CPU cooling fans on every computer I ever owned. Not sure why I waited so long to add them to our beloved c64! Even the colour scheme is perfect. :
The New 6500 CPU's - 1983 | Commodore Computers: C64 VIC20 PET C128 Plus4 - 8 Bit PC's
MOS CPU Replacer (6510/8501)
COMMODORE 6510 IC CPU FOR COMMODORE C64 YOU PICK TESTED & WORKING | eBay