HEC X-power 650 - Good or Bad?

That model in particular? Bad. Do not buy. If you need a cheap PSU, there are other better options available.
 
That model in particular? Bad. Do not buy. If you need a cheap PSU, there are other better options available.

I agree with you that an HD 5850 should not be run with a cheap, crappy PSU no matter the wattage claim. That particular PSU is IMHO barely a 400W PSU under realistic conditions (internal PSU temps of 45°C/113°F to 50°C/122°F). The "650W" rating had been achieved at an unrealistically low internal operating temperature (inside the PSU itself) of only 25°C (77°F). The only way to achieve that low of an internal PSU temperature would be if the ambient temperature was 0°C/32°F!
 
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