Is this PSU good enough...

I probably wouldn't get a Raidmax PSU. I don't think you need a Corsair, though. Generally they're a bit overkill. Try this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151091
Seasonic is one of the best PSU brands. This one is cheaper than the Corsair, and can put out a lot more power.

It isn't that Corsair are overkill, more over rated. They make good power supplies, or rather they put their name on good power supplies (with the exception of some in the more recent lines), but they aren't leagues ahead of other good brands. You pay to have their name on the unit, rather than because they offer far superior quality

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207007

Would be a very very good unit, much better than the raidmax or corsair that you posted, yet after MIR is the same price as the raidmax unit

That one doesn't have enough PCIe connectors, sadly. :( IMO the 650w Seasonic I posted is still a good deal. It gets the same 80 plus Bronze rating as the XFX, and is probably a bit better quality. The ridiculously high-quality Seasonic gets a gold.
1) It's not difficult to just use the molex to pcie connectors, as the unit is more than adequate to power two 460's.
2) The unit you linked is not really a high quality seasonic unit, it's more of one of their budget units. Not saying its a bad unit by any means, but the XFX is definitely a better unit.
I guess in that case they're probably almost the same PSU, but if it was me I'd rather pay $10 more upfront and not half to deal with a rebate. I'd also still trust the fan, casing, etc. more if it were straight Seasonic.

The Corsair TX units were Seasonic, and you would trust them the same as a SeaSonic unit, right? Just because it is Corsair and people say they are the best of the best and no matter what can't be beaten, even when it is proven that they can and are by quite a good few other units

XFX don't make bad units, they don't make units, but the fans and casing aren't low quality, you aren't going to see the internals being the sort of quality you expect of SeaSonic, then the fan and casing being utter crap, they don't work like that, the fan and casing will be the sort of quality that you expect from XFX, which is very good
1) Corsair TX units are all CWT built units tweaked by corsair, as well as most of their HX line. Honestly at this point in time i wouldn't even touch a TX power supply as there are far more better options out there. The HX line is still pretty decent though not very competitive on the price front(XFX makes better units for less money, especially the M12D based 750/850W units).
2) Eh, XFX is known for making everything as cheap as possible, which is why they cost cut their cards by swaying from the reference design, removing phases in the PWM, etc on their cards. However, the fans used in the 650W units are made by ADDA, which makes fans for pretty much every power supply on the market. Including corsair...
Think about how many of those units they produce and sell. Even if there were a hundred people on there all saying " the fan isn't working right" it isn't a large enough sample to justify saying the fan or any other part is deffective. The fact that people still regard XFX units as very very high quality is evidence enough that the sort of problems flagged up by newegg reviews (which aren't reliable sources for whether a product is high quality or not, because most of the people leaving comments are complete morons when it comes to computers) aren't common at all
Correct, sample size is everything. For starters, most people don't review a product unless they actually have something wrong with it, when they have something wrong with it, they feel that writing a review is going to give them some kind of satisfaction. Secondly, anyone who has dealt with computers long enough knows just to skip past the newegg reviews, as you have people who don't know what they are talking about, fanboys, and company reps trying to sway purchasers of a product in another direction. Case and point, tons of crappy rosewill power supplies with 5 star ratings.
 
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Last time I looked, I was under the impression that the 650TX was a Seasonic unit. Unlike the other CWT TX units.
The OEM changed on the 650TX a couple months back, its now a CWT PSHII based unit. The old 650TX was a seasonic S12 unit.
 
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