Originally Posted by Alan G
Seasonic, my go to brand, makes a couple of 300W PSUs that are likely candidates such as the SS-300ES (http://www.newegg.com/Product/Product.aspx?Item=N82E16817151085
). Apparently the 330W S12 is no longer available and for that particular model I would have to go to a 380W PSU which is probably a lot more than I need. Am I good if I select the OEM 300W model? Reviews on NewEgg are quite positive.
NewEgg reviews are random, usually posted just after purchase, and not based on any scientific tests, just consumer gut-feeling. The SS300ES is not on the OCN recommended list http://www.overclock.net/t/183810/faq-recommended-power-supplies
nor has it been reviewed by any respected testers like ChipHell or Jonnyguru. I would go with the S12II 380W to be sure you have a reliable unit.
Originally Posted by Allanitomwesh
If seasonic say it's bronze,it's probably just shy of silver.
Remember that 80plus rating is not directly a measure of the quality of a PSU overall, it's only a measure of how much of the AC current is converted to heat instead of DC. Seasonic are a good PSU manufacturer, but it doesn't automatically follow that their units are all magically more efficient. Especially on a $38 low-power model.
On the Seasonic SS-300ES efficiency was tested at light load 82.07% and typical load 85.35% so it's just barely efficient enough for bronze rated which needs 82% and 85%. To get silver rated it would need 3% more efficient overall, which doesn't sound much, but means all the components together would need be 15%-20% less wasteful. You can see all 80Plus test results here http://www.plugloadsolutions.com/80PlusPowerSupplies.aspx