Hi, Currently I'm using a dual core 6850 and I'm thinking about buying a quad core. I have a PSU of 500 W as spare.
Can i replace the CPU to a Quad Core without changing the cooling system?
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Your spare 500W power supply likely DOES NOT HAVE sufficient 3.3v/5v power and therefore will not work. If you do not use the performance copper heatsink it will work but the fan will be running all the time. The Copper heatpipe heatsink is the same as the GX620 heatsink. HEATSINK D9729 SHROUD J9761
That power supply is ATX and not EPS12V
Better is not the issue. Dell power supplys are 80 percent efficient not 70 percent ATX. The -5v rail is an issue as well as this may cause a motherboard fire or damage your system. Its a dead giveaway that this is a power supply from 1990 to 2000.
What current is on which rails is not trivial. There is a single 12V RAIL on that unit and its max is 17A
EPS 12V units have multiple rails of 12V @ 18 amps each. MAX Power on the 12V rails is 264w not 204w
That unit has a lot more on the 5V and 3.3V rails at the expense of the 12V rails and CPU 4 pin connector. So no that spare unit is not likely to work well if at all.
Recommended update or replacement is EVGA 750B1