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HX850 vs AX850?

post #1 of 9
Thread Starter 
I'm really not seeing much of a difference here, and i'm highly confused..
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139015&Tpk=AX850 AX850 @ 189.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011&Tpk=HX850 HX850 @ 169.99 + $30 Gift Card

What exactly is the different in between the two?
This will be powering an i7 2600k and crossfired 6950s, two hdd's and one ssd.
unless there is a better psu for the price, i'm thinking about going HX850 because of lower price + gc?
I honestly don't see the difference in them, lol.
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post #2 of 9
One is gold certified and the other is silver.
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post #3 of 9
Get the ax for sure. Its deadly quiet and its full modular. The fan doesn't spin unless your system is under load.
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post #4 of 9
Quote:
Originally Posted by Phaedrus2129 View Post


Corsair's power supplies are made by two companies: SeaSonic and Channel Well Tech (CWT). SeaSonic was a major supplier of high-quality server PSUs for many years before entering the consumer market. Their designs are found in dozens of power supplies sold by as many companies, and their retail units are often among the best in their class. CWT is a company with a more troubled history, that had a marred reputation prior to its partnership with Corsair. CWT now produces mostly high-quality power supplies with only a few low-end units made for other companies such as Thermaltake.



HX (new) series
High-end enthusiast units, modular cables, rated at 50C, Japanese caps, 80+ bronze or silver, 7 year warranty.

HX450 - SeaSonic S12II (SS-***ES)

HX650 - SeaSonic S12E

HX750 - CWT DSG

HX850 - CWT DSG

HX1050 - CWT DSG



AX series
High-end enthusiast units, fully modular cables, rated at 50C, Japanese caps, 80+ gold, 7 year warranty

AX650 - SeaSonic X (v2)

AX750 - SeaSonic X (v2)

AX850 - SeaSonic X (v2)

AX1200 - Flextronics, custom

Source

thumb.gif
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post #5 of 9
Thread Starter 
Awesome, thanks you two, AX is definitely better, was just curious because I didn't notice anything right off the bat.. but then again, i'm not very savvy with PSUs so it's not like I exactly knew what to look for..
Is there a better PSU in the 180ish price range?
Preferrably @ or under 180.
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post #6 of 9
I wouldn't say better but just as good.

By the way you don't need an 850w PSU for your rig, a quality 650w should be fine.

Any of these would do the job fine:

XFX Core Edition PRO650W

CORSAIR Enthusiast Series TX650 V2 650W

OCZ ZT Series 650W

I would probably go for the OCZ, fully modular, 'great wall' internals and $90 after MIR smile.gif
Edited by munaim1 - 12/30/11 at 8:44am
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post #7 of 9
Thread Starter 
Well, in this new rig I was planning on overclocking both gpu's/cpu so I was just taking assurance purposes on choosing an 850w
Do you have any recommendations?
I personally would feel unsafe going anything below a quality 700w, but like I said before, I know nothing about PSU's so i'm just kind of talking out of my ass here.
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post #8 of 9
I can assure you a quality 650w would do the job, however, if you want, go for a 750w PSU which is still more than enough, 850w is just unnecessary.

I'll try to explain the reasoning:

Here's a review done by guru3d on CF 6950 using the 1366 socket (NOTE: more power hungry than 1155)
Quote:
Our test system is based on a power hungry Core i7 965 / X58 system. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.

Guru3d doesn't use Furmark anymore because of the unrealistic load that it produces, even 'hefty' gaming as they call wont produce furmark wattage, the difference can be between 50-100w. Anyway during their testing, while using 'their' application, the GPU's pulled the following from the wall:

System Wattage with GPU in FULL Stress = 473W
Subjective obtained GPU power consumption = ~ 329 Watts

From the wall is not the same as what the actual PSU provides to the system, during transfer of AC to DC and heat output the efficiency drops. Now assuming 85% efficiency, the actual 'System Wattage with GPU in FULL stress' would be around 402w. Guru3d also mentions that you must add a further 100-150w for the rest of the system including cpu load. A total power consumption, taking into account the efficiency and AC to DC current conversion, it would be around 500-550w, therefore a quality 650w is more than enough, you have around 100-150w to play around with which is plenty unless you're into breaking world records. thumb.gif

Just a note the same would apply to the subjective power consumption, It was measured while gaming, that would indicate the lower wattage count of 329w. So there you have it, the load wattage will be much less if you're gaming, but obviously depends on the game and how intensive it is (400w or thereabouts for the ENTIRE system when gaming) smile.gif
Edited by munaim1 - 12/30/11 at 9:40am
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post #9 of 9
The HX850 actually has slightly better performance, but I think most users would prefer the AX850 for full modularity, quieter fan (control) with fanless mode, shorter casing, slightly higher efficiency, and so on.

As stated though, 650W is already plenty, unless you're going really nuts on the overclocks, upping the power limit on both HD 6950s, and plan to bench stress test Furmark + prime95 all the time. The XFX Core and Corsair TX V2 are pretty much the same very solid unit internally, but the TX V2 only has 2 PCIe power cables (boo). But at roughly that price, a superior option is the Rosewill Capstone, which is a high-end design more along the lines of Corsair AX/HX quality but not modular. 650W Capstone is available for $90 shipped until 12/31.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182071

Aside from the modular cables on the Corsair AX/HX, there's not particularly a reason to favor them, so is it worth the price premium?
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