hi guys need a new psu for pc , is there any thing i need to know befor buying one ??? or are they all the same ??? this is what iam looking at ALPINE 500W PSU SWITCHABLE POWER SUPPLY 24pin +4 pin, 1 x SATA, 2 x MOLEX | eBay
and
EVO LABS 500W 12CM SILENT PSU EXTRA SILENT SWITCHABLE POWER SUPPLY UNIT RETAIL | eBay
and
EVO LABS 500W 12CM SILENT PSU EXTRA SILENT SWITCHABLE POWER SUPPLY UNIT RETAIL | eBay
if not press the green tab to tell me to f**Koff 
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