I have HP 8200 elite CMT CPU in which 320 watts PSU is installed. I want to use AMD Radeon HD 7770 that requires more power (minimum 400 watts supply) for full performance. But the fact is, the higher watts PSU is not available for my cpu because its cables don't match with that. So I want to ask if I can use external PSU to power my GPU instead of CPU power supply. Will this harm for my PC?
Kindly help me out to solve this issue.