Here on this site, we have a Power Supply Unit tier list. Each rated power supply is listed on a scale of 1 to 5 (with 1 being the highest quality). When people state that their getting Corsair power supplies without mention of the model, my first assumption is that they are buying a Corsair CX model, which has a poor reputation on this site, and is listed as a tier 4 PSU; all the tier descriptions are listed below. By the way, Corsair has some excellent models of power supplies, but the CX line is not one of them. In addition to us recommending a power supply from either tier 1 or tier 2, we also refer to the "power requirements for graphics parts" page. The power estimates are conservative, but I believe that was done on-purpose, in case someone uses a lesser quality power supply.
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PSU tier list ***
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
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power requirements for graphics cards ***
http://www.realhardtechx.com/index_archivos/Page362.htm
Tier One
The highest quality and most stable Power Supply Units available. Protected by industrial grade protection circuitry and can output wattage at a rated maximum temperature of 50°C or below. These units are also Haswell certified, meaning they can cope with the C6 and C7 sleep states of 0.05Amps without triggering the under-current protection switch. May even go over labelled wattage and still work until it safely shuts down.
Tier Two
As above, just slightly lower quality. Still safe to use and are all stable for any PC of today's standards, including Haswell C Stepping certification. Recommended for those on a fairly limited budget.
Tier Three
Some Haswell compatible, some not (maybe unconfirmed). Still safe to use and stable, just lower quality components. Not really ideal in serious overclocking or super-high load situations, such as a Bitcoin mining rig or a high end gaming system.
Tier Four
Built down to a low price. Not exactly the most stable units ever created. Very basic safety circuitry or even thin gauge wiring used. Not for gaming rigs or overclocking systems of any kind. Avoid unless your budget dictates your choice.
Tier Five
Avoid IMMEDIATELY. These units are highly unsafe to use. No such protections added, very thin gauge wiring used, false advertising and too much to list. Reference to a higher tiered unit for a better, money saving and a much safer unit. For your safety's sake, please don't order or pick one up for use in your system. These units are a potential fire hazard and could even kill you, let alone your system.
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