So I am intending on upgrading my GPU from a GT120 to a HD5670 (single card, not doing crossfire), but currently my Compaq only has 300W on its OEM PSU. So I am currently looking at 2 Cooler Master PSU models.(which are within my budget.)
The 1st one is the CM eXtreme Power Plus 460W (which has more than enough power that I need.). 76%++ efficiency
The 2nd one is the CM Silent Pro 500W (definitely abit overkill). 80% ++ efficiency
The problem is the 1st PSU above does not have 80+ certification but the 2nd one has it but will cost me more about SGD$30.
So the question is, (I'm a casual gamer, not hardcore, and I don't OC), do is it better to get the 2nd PSU or the 1st one and why??? Experts please HELP!!!
The power supplies you listed will both work for you... however from personal experience... Cooler Master power supplies are over-rated by 100w and you cannot trust that what they say and what you get are the same.
With the specs you have and card you want to install, 400-500w from Antec, Corsair or the like will be better in efficiency and you'll get the true wattage they are rated at.