Found great deal on 650watt CoolerMaster, $39.99 after $40 rebate, free shipping!

http://www.newegg.com/Product/Prod [...] 6817171014

is that a good psu?

I'd say no. Its in Tier 4.
http://www.xtremesystems.org/forum [...] p?t=108088

-mcg

It's a laughable unit at best.

I got one
My sys only needed ~500w so i figured an average 650w would be fine.

Handles my Q6600 @ 3Ghz, 4 sticks ram, 3Hdds, water pump ~10 fans, CCFL's etc with no probs.

Voltages are always stable and always very tight.

Problems... depending on ur case/air flow heat can be an issue. The fan will ramp to manage this fine, but then its easily the loudest component in ur rig. I took my fan out and replaced it with an antec 120mm which solved the problem.

Yeah it may be a tier 4 so i wouldnt push it to the max, but if u need ~500w its not really such a bad buy IMHO.

Well if your system needed 500W under load you should've gone for a high QUALITY 600W+ unit like a Seasonic M12 600W or Corsair 620HX, in the long run you might end up regretting it.

So you have one, or you have seen a detailed test?

I've got one but I've not used it yet so I really don't know if it is a good PS or not. I suspect that it is not the best and I also suspect it is not nearly as bad as you say. If you have proof to back up your opinion please post it. NewEgg's customers give it 4/5 stars so most are happy with their purchases.

Most customers don't know what they are buying also. It's been reported as a Tier 4 unit, also Cooler Master is KNOWN not only for making great cooling solutions and cases, but also for their subpar power supply units. It will power your system if it's not too demanding, but the rail stability, efficiency, and overall quality of the unit leaves a lot to be desired.

Note: I believe the ONLY decent Cooler Master unit is the Real Power Pro 1000W, which is far beyond the price range of this unit.

To top it off, it only advertises 2 12V rails of 18A each, not mentioning combined power output, if it's peak or constant, or other information, which leaves me with a big feeling of uncertainty over the unit. If you feel that the unit works wonders for you, then I'm happy but people here are looking for help, not to be confused and make poor choices on their components (Especially one as critical and misunderstood as the PSU).

I installed the CM650 this weekend.

It works fine and runs cooler than the previous unit but it is loud after it warms up which is surprising because it has a large 120 mm fan. It isn't as loud as my ATI 1950xt video card so I'm going to move it into that system so all the noisy stuff can be together.

I think the big issue with this PS is a matter of paradigm. At any price it is a crappy 650 watt PS if you actually need all 650 watts. If you think of it as a $40 500 or 550 watt PS it becomes quite a bit more attractive, in fact you really couldn't beat it for the money.

Now that is no longer for sale I wouldn't touch it as there are much better Power Supplies on the market at the price it is going for now.

Price makes all the difference. I'll put up with a little noise for $40. If it costs $100 it better be darn near perfect.

I'll pass.

ill agree with EMP

ive had this a few times now, although they have been the crappy psu you get with a £20 case, but same goes for cheap ass retail ones

built 4 systems with the psu that comes with the case, around a year later all 4 systems go down around 2-3 months of each other, PSU FAILs

you get what you pay for, hence the reason for the PSU tier system

you cant skimp on a psu if you want to OC or have the latest hardware, £1000 worth of hardware could be destroyed because of an £20 psu

LOL Good Point, My Psu Was A Ultra 550 That Powered My System For A Year Over Clocked And It Died I Called Ultra And They Said Send It Back Which I Did And I Got A Brand New One Which I Put In My New C2D 6750 System. Always Get A Good Psu

I just got a Coolermaster 550 for $30 shipped, and it is for a Unix build. But, the Coolermaster Extreme Power are not as good as the Coolermaster Real Power. Quite a big difference in quality.

Bless you for posting that link. I'd been curious about the various tiers for a while.

I would not use it even for free. Some folks forget that when a PSU fails, it can sometimes take everything else with it, depending on the type of failure of course. I have posted this before, but it applies to this thread as well.