Originally posted by: RuffRyder1672
does anybody know a good resource that explains some stats of a power supply? I usually just buy what people say is good (and cheap). For example, I am interested in 12v rail. What is it, what is its significance?
I just bought this to upgrade my enermax 350W (? - maybe 330) power supply. Is this a good upgrade? From using a calc on the web, it seems like I nearly had the enermax maxed out.
Thanks for your help!
Online calculators are often misleading. Actually, I've only seen one that was even close to correct, most GROSSLY overestimate power needed, which only seems to apply if compared to a generic PSU that randomly had similar gross overrating of it's true capacity. Unfortunately I don't recall and ATM, don't have access to a link for that calc.
Primarily consideration is on which rail(s) need most current, and how power supply is responding to that load. For example, typical sign of a power supply near max capacity is that one of the (the most loaded rail) has voltage staying near spec if not dropping below spec, while the OTHER, less loaded rail has risen significantly (over 3-5%). This shows that power supply is already approaching peak output and any sudden surge (like loading a game level or coming out of HALT-Idle state) could result in voltage depression after recovery time that is not fast enough, induces crash or at least stress on motherboard.
Enermax are overrated compared to other popular, similarly priced name-brands. You have not provided spec of your system but odds are for a semi-modern power build, the Enermax <=350W (by
their labeled rating system) is borderline. By contrast, similar if not cheaper Fortron 350W will run more hardware, but ideally higher wattage is a prudent purchase these days.
GOOD <> CHEAP
Unless you find fairly rare closeout/surplus deals, rather than a sale price, there are no cheap good PSU. Fraudulently rated 660W generics are no deal unless system really only used ~ 200W, and if that generic happens to have a amperage-rail distribution that coincides to what the target system needs... even so, often noise filtering is poor and generic rear exhaust fans are one of the weakest links, more prone to failure.
The is a good value power supply (Thermaltake 420W), with true output capacity higher than your Enermax. If system ran with the Enermax this should be suitable yet due to nature of upgradable-PC, only you can forecast how much margin you have for the future with *any* particular power supply.