Corsair Gold AX850 PSU

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MikeC
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Corsair Gold AX850 PSU

Post by MikeC » Wed Sep 22, 2010 9:30 am

Mike Chin, SPCR Editor/Publisher
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Modo
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Post by Modo » Wed Sep 22, 2010 9:59 am

Looks like we know what to get, if the SeaSonic X-series doesn't provide enough power.
Can you keep it down? I'm having trouble hearing the artillery.

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kater
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Post by kater » Wed Sep 22, 2010 10:03 am

Another boring review of another boringly great PSU ;) *

Is it too much to want a PSU like this in < 500W range and at < $ 100?

* smiley is here for joyless haters who need it to properly read the post...

frenchie
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Post by frenchie » Wed Sep 22, 2010 10:31 am

Good review, thank you !

On page 4 : the * on the "Enermax Modu82+" line in the comparaison chart should either be removed (confusion with the other * in the chart) or replaced by another symbol to explain the complaints about noisier than expected fan in the Enermax (I believe that's what the * is for).
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merlin
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Post by merlin » Wed Sep 22, 2010 1:09 pm

kater wrote:Another boring review of another boringly great PSU ;) *

Is it too much to want a PSU like this in < 500W range and at < $ 100?

* smiley is here for joyless haters who need it to properly read the post...
It might be boring, but it certainly gives us proof that unlike the latest Corsair HX psus, these Seasonic X-Series based corsair models are truly quiet like their pedigree was. I'm glad to see this and the X-series are definitely top recommendations for basically any high power system. :p

Also your want for a lower end power supply with similar characteristics might be satisfied by a Seasonic X-560. Hopefully that'll get close to the $100 mark. It will probably be my pick for a quiet mid-power psu.

Also I think the next psus of interest are the HCP and HCG made by Delta, very curious how quiet these guys will be.
Quiet Wuv Wizzie
Main: I5-3570K at 3.7ghz, 16GB DDR-1600@1.35v, Asrock Z77 Extreme6, Corsair 330R, Seasonic 760XP2, Sapphire Radeon 7950| Secondary/Lan: Core i3-2100, 4GB, Msi H67MA-E35, Radeon 6790, Sugo SG02| HTPC: Core i3-2100, 4GB, AsRock H67M-ITX/HT, Antec ISK300-65| NAS: Core I3-2100, 8GB, Antec TP-550, Lian Li PC-Q08B, 4X2TB WD Green| Lappy: Latitude D620 Core 2 T7600, Quadro NVS 110M

CA_Steve
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Post by CA_Steve » Wed Sep 22, 2010 5:20 pm

Great review. Thanks!
1080p Gaming build: i5-4670K, Mugen 4, Asrock Z97 Anniversary, MSI GTX 1660 Gaming X, 8GB 1866 RAM, Samsung 860 Evo 500GB, Crucial MX100 256GB, WD Red 2TB, Samsung DVD burner, Fractal Define R4, Antec True Quiet 140 (2 front + rear) case fans, Seasonic SSR-550FX. 35W idle, 45-55W video streaming, 170-200W WoW, 318W stress test (Prime95 + Furmark)

webs0r
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Post by webs0r » Thu Sep 23, 2010 12:35 am

Thanks for the review.

I'm thinking of grabbing one of these for a file server build now.

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Post by Spawn » Thu Sep 23, 2010 1:16 am

It's a decent assumption. :)
You must have 3 posts before you can post URL's/Links.
Hm, another rule which I feel it wasn't meant for people like me. I can understand it though.
This will be my 3rd post, I wonder if I can edit it later?... :roll: :)

LE: :wink:

KayDat
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Post by KayDat » Thu Sep 23, 2010 8:43 am

Very nice PSU. I think my upgrade plans are unchanged though...as nice as 80PLUS Gold is, the CP850 costs 40% less, and has very similar noise performance whilst isolated from system heat.

Compddd
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Post by Compddd » Thu Sep 23, 2010 10:41 am

Makes me wonder what the forthcoming Seasonic X-850 and X-1000 units are going to be like when they are released :)
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quest_for_silence
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Post by quest_for_silence » Thu Sep 23, 2010 12:56 pm


I guess this sample also miss to reach 87% (and by far) at full load (exactly as the previously tested Cougar GX-700), while "real" Seasonics does (and Enermax almost too). May it be typical of Gold units above 650W?

Regards,
Luca

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Post by MikeC » Thu Sep 23, 2010 1:17 pm

quest_for_silence wrote:

I guess this sample also miss to reach 87% (and by far) at full load (exactly as the previously tested Cougar GX-700), while "real" Seasonics does (and Enermax almost too). May it be typical of Gold units above 650W?

Regards,
Luca
Probably. The impact of internal heat on efficiency is always more significant as you go up in power load. I don't see this as a serious failing on the part of the manufacturer -- it's really a serious flaw in the 80 Plus test procedure, which ignores operating/environmental temperature. I've reapeated myself on this point for so long and so many times (including directly to 80 Plus) that I hardly bother any more.

FWIW, the Corsair AX850 reached 89.2% efficiency at 700W out of the hotbox. This was the highest load I tested it with outside the hotbox, so it seems safe to say the unit would have made 87% at full power in "23°C ± 5°C" -- ie, max temp 28C. (Ditto 90% at half power at the same temp range instead of the 43~45C in my test.)
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quest_for_silence
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Post by quest_for_silence » Fri Sep 24, 2010 9:40 am

MikeC wrote:-- it's really a serious flaw in the 80 Plus test procedure, which ignores operating/environmental temperature .

Apropos of methodology: what do you think, if any, about Oklahoma Wolf's own method?

Sometimes he's got substantially different numbers at full load: see M12D-850 reviews for a quick comparison, on SPCR it's clearly missed the Silver requirement, while on Jonnyguru it's easily got it, even in its own hot box at 43°C.

However things go different with the AX-850: at JonnyGuru it slightly misses Gold level at any testing point (sample variance?), but even not so definitely as in SPCR findings.

Regards,
Luca

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Post by MikeC » Fri Sep 24, 2010 9:48 am

quest_for_silence wrote:
MikeC wrote:-- it's really a serious flaw in the 80 Plus test procedure, which ignores operating/environmental temperature .

Apropos of methodology: what do you think, if any, about Oklahoma Wolf's own method?

Sometimes he's got substantially different numbers at full load: see M12D-850 reviews for a quick comparison, on SPCR it's clearly missed the Silver requirement, while on Jonnyguru it's easily got it, even in its own hot box at 43°C.

However things go different with the AX-850: at JonnyGuru it slightly misses Gold level at any testing point (sample variance?), but even not so definitely as in SPCR findings.

Regards,
Luca
Impossible to say what the causes of those differences are. Different loader; his is probably more accurate, as mine is more or less DIY. But it looks like my box gets a little hotter. No surprises there -- the exhaust is just one Nexus 120.
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Moo
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Re: Corsair Gold AX850 PSU

Post by Moo » Fri Oct 15, 2010 2:26 pm

So the fan doesn't spin at lower loads/temperatures because the voltage going into it isn't high enough to start it spinning... Isn't the power going into the fan at this point just being wasted? Wouldn't it be more sensible to have the fan power completely switch off when it isn't needed?

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Re: Corsair Gold AX850 PSU

Post by MikeC » Fri Oct 15, 2010 3:59 pm

Moo wrote:So the fan doesn't spin at lower loads/temperatures because the voltage going into it isn't high enough to start it spinning... Isn't the power going into the fan at this point just being wasted? Wouldn't it be more sensible to have the fan power completely switch off when it isn't needed?
Probably around 0.1W. It's not the most efficient way but it works because the fan has such low start speed & good bearings. PWM makes it work more the way you suggest but it's more costly, afaik -- which might be why it's not used in the Corsairs while it is used in the Seasonic X series.
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lodestar
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Re: Corsair Gold AX850 PSU

Post by lodestar » Fri Oct 15, 2010 9:17 pm

PWM was used in the "old" X series X-650 and X-750. The "new" X-series such as the Seasonic X-560 use the same two wire non-PWM fan arrangement as the Corsair. So I guess this is another of those differences of detail between the older and newer generation of Seasonic X devices.

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