CoolerMaster Launches Three Budget Power Supply Units
Cooler Master’s new range of entry-level power supply units feature a 120 mm cooling fan, an efficiency of 85 and are currently available in 500W, 600W and 700W variants
CoolerMaster has launched three new budget-friendly PSUs: the B500, B600 and B700, which as the name suggests, have a capacity of 500 W, 600 W and 700 W, respectively. With regards to the 12V rail, the B500 is rated for 24 amps, the B600 for 47 amps and the B700 for 55 amps.
The units also feature a temperature-sensitive 120 mm PWM cooling fan, an MTBF of at least 100,000 hours and an efficiency of 85 percent. As is the norm for entry-level power supply units, all three have a fixed design and provide a 20+4 pin motherboard connector, two 6+2 pin PCI-e connectors (four on the B700), a 4+4 pin connector, six SATA connectors, three molex and an adaptor for a 3.5" floppy drive.
The CoolerMaster B500, B600 and B700 power supply units are currently available with a recommended price of €39.90, €49.90 and €59.90, respectively.

In actual good news from CoolerMaster they do seem to have 3 new models coming up from....??!! Seasonic !!?? Yeah I almost fainted too. The new V series in 700, 850 and 1000 watts actually using Seasonic as an OEM. Amazing.
What is typical load by the way?
Even my gaming PC uses less than 150W (my UPS reports 186W load but that includes my modem, router, 24ports switch, USB hub and LCD) so I would be far more interested in high-quality (built to cleanly sustain 10-100% combined load), high-efficiency (gold/platinum) 200-250W PSU somewhere in the neighborhood of $55.
Right now, I have a 650W Earthwatts simply because it was the only decent PSU my local PC store had in stock with long enough ATX/ATX12V cables to reach my motherboard's connectors.
Funny that CM would announce a 'budget' lineup when their existing lower-end PSUs are already of questionable/passable quality.
I'm a bit surprised by some of this. 85% efficiency doesn't say budget to me, nor does including a molex to floppy adapter. Almost seems that these are normal PSUs. I'm guessing they are cheap because they are using older group designs and probably are missing parts (MOV, filtering caps, etc) compared to more modern designs. BTW, I'd double check the amps on the 12V rail for the 8500. 34A would make much more sense instead of 24A. And would be more consistent with the other amps listed.
No money in it. People buy based on number of watts. Not enough people would buy a quality 300-350W PSU when they can get a 430-500W for the same price. The best lowend PSU you can probably find is one of those Bestec units. They aren't THAT bad. Or a fanless model as those are usually really good, but they will be pricey.
Then you need a new gaming PC
Antec has a few power supplies in that bracket, the BP350 and the Earthwatts EA-380D. Seasonic has a pile of power supplies at 300W, 350W etc:
SS-300ES Bronze
SS-300ET Bronze
SS-350ET Bronze
SSR-360GP
S12II 380B
SS-350M1U
The problem is, a quality 300W power supply is barely any cheaper than a decent 500W power supply, and most people overestimate the wattage required.
Edit: Whoops, a few of those Seasonics weren't ATX.
Chances are these will never be reviewed at any of the reliable sites, unless they buy them at retail. Cooler Master almost never send out their budget units for review because they know the result will be awful.
They didn't review any of these new Cooler Master PSUs, and in fact they rarely do review Cooler Master PSUs. The last one dates back to May 2012, and the one before that was March 2011. This is probably for the reason I mentioned before - Cooler Master know their budget power supplies will usually not fare well in an honest, thorough review, so they simply refuse to ship samples for review. Problem solved, as far as they are concerned.
The OEM for the B Series is Enhance Electronics.
Yes, and that sort of dishonesty is why I won't let up on them.
If these new ones are 80+ bronze that might suggest they are more reasonable (despite the artificially low 23C ambient temperature that 80+ uses), except that their 80+ Bronze GX-650 was summarized by HardOCP as a "polished turd in a box."
Edit: saw ko888's post. If they're not 80+, the 85% efficiency claim is most likely another bald faced CM lie.