Hello:
Making a purchase decision on such a critical component fro your PC as is the PSU based soley on cheap price is a VERY flawed decision.
There are many factors that need to be looked at to determine if a PSU is suitable for a certain rig.
Efficiency rating is a biggie more than 70% is very desirable
active or passive power factor correction (PFC) is another = active is better
method used to determine the wattage rating, most sleasy PSU makers test and rate their PSU's at 20C >>>> there is no PC in the world that going to have an internal case temp of 20C ! therefore the hotter the PC gets the less stable it becomes.
It amazes me how guys will spend full boat for the fastest CPU, video cards and plenty of memory then buy a $40.00 ULTRA psu !
Please dont even speak of Ultra and Antec in the same breath. And if you think ULtra is even a medium quality unit, you better look up Johhny Guru's PSU website >>>> those units have very wobbley 12V rails when pushed hard. Granted they are not as bad as the Allied & Dynex type psu's but one thing you must remember, when you burn up a motherboard, ram or expensive video card & hard drives that extra $40.00 you saved will be long forgotten !
There is no other single component that can wreck as many parts as can a faulty PSU.
If you are tight for budget, look on newegg.com for the Fortron 450watt PSU thats costs $51.50 I guarantee that unit will kick the dog snot outta the 500 watt Ultra.
Another thriffty buy is the Antec SP-500 for $68.00
Speaking of Antec units as if they are overkill and budget wasting is wreckless. Antec acutally is the lower tier of the High Quality PSU's.
"The sweetness of low prices is long forgotten when the bitter reality of poor quality sets in! "
goodluck to you if you already bought that PSU.
best regards
joe