What is this???????????

every psu has at least one 12volt rail. it is absolutely neccissary or else ur pc would not function. it provides power to most of the copmnents. some psus have a higher rated single rail and some have multiple sligh;ly lower rated 12v rails. i recommend you get a 450watt corsair or antec psu. also seasonic is a good brand.
cm is not known for its amazing psus, they are moderately ok, thouhg, as long as they arent stressed to much for too long.

Hm.. kind of hard to understand ya there bud.

Are you asking us if coolmaster has a PSU with 80+ bronze and a high 12v rating?

Are you asking us what a good 12v is, and what 80+ bronze means?

Are you asking us if your specific PSU you are buying has these things?

whos hard to uderstand, me or the op???

yah my question is

1.what is 12v rail and 80+ bronze

2. does these things will come for CM 500W PSU and also CM PSU is good or not........and one more thing it wll support crossfire/SLI

yah shovenose is correct

80+ is the energy efficency rating. from worst to best:
NO 80+, plain old 80+, 80+ bronze, silver, then GOLD!!!

what specific cooler master psu are you looking at?

that is what im asking which one is good in CM dude

if u want to konw which cm psus are really good: very few...
if u want to know IF theyre good: somewhat, mediocre, etc...
get this instead if possible:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
high quality, plenty of power, and quiet. also good price

CoolerMaster makes some great cases. But they either have not quite learned to make PSU's yet or they do not want to spend the money.

yes

The OP.  

In my mind I was seeing 3-5 questions in the OPs scentence lol.

OK COOOOOOOOLLLLLLLLLLLLLLLLLL!!!!!!!!!!!!!!!!!