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 Post subject: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Fri Jan 03, 2014 6:25 am 
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Hi all,

I really wish I read further into this prior to making my purchase but I bought this power supply (model P1-750B-BEFX) roughly a week and a half ago and have assembled my PC. The power supply itself received very positive reviews but one aspect I regretfully failed to investigate was it's noise level. It has a hybrid fan option, so the fan does not run under a certain load percentage, and since I don't yet have a graphics card, the fan isn't running at all. It is completely silent, and I am happy with that.

However, my concern is the level of noise it'll provide when the fan does get around to spinning (which will presumably occur when I install a graphics card - I'm thinking of a 670/760/770/7950/7970).
Does anyone have any experience with this particular model?

Thanks in advance. :)


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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Fri Jan 03, 2014 7:55 am 
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Welcome to SPCR.

This is a rebadged Seasonic X-750. Under typical thermal environments, the fan will start at ~25-30% load.

You don't mention the rest of your system, let's assume it's based on a 95W IVB CPU. So, CPU + mobo + a couple of drives and fans leads to under 150W stressed load. More typically 100 to 125W gaming load.

Add a 170W gfx card like the GTX 760 and it's 320W stressed load / ~ 275W gaming load. The PSU might not turn on. If it does, it'll be quieter than the gfx card.

Worst case: adding a 250W gfx card. Stress load is 400W, gaming load of ~ 350W. For gaming, fan will probably be in the 16dBA range and will still be quieter than your gfx card. Here's a look at the original X-650 for comparison.

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1080p Gaming build: i5-4670K, Mugen 4, MSI Z87-G45, MSI GTX 760 2GB Gaming, 8GB 1866 RAM, Samsung Evo 250GB, WD Red 2TB, Samsung DVD burner, Fractal Define R4, Antec True Quiet 140 (2 front + rear) case fans, Seasonic X-560. 35-40W idle, 45-55W video streaming, 170-200W WoW, 200-230W Rift, 318W stress test (Prime95 + Furmark)


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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Tue Jan 07, 2014 11:08 am 
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CA_Steve wrote:
Welcome to SPCR.

This is a rebadged Seasonic X-750. Under typical thermal environments, the fan will start at ~25-30% load.

You don't mention the rest of your system, let's assume it's based on a 95W IVB CPU. So, CPU + mobo + a couple of drives and fans leads to under 150W stressed load. More typically 100 to 125W gaming load.

Add a 170W gfx card like the GTX 760 and it's 320W stressed load / ~ 275W gaming load. The PSU might not turn on. If it does, it'll be quieter than the gfx card.

Worst case: adding a 250W gfx card. Stress load is 400W, gaming load of ~ 350W. For gaming, fan will probably be in the 16dBA range and will still be quieter than your gfx card. Here's a look at the original X-650 for comparison.



Thank you very much for the timely and informative + consoling reply. Hah -this is my first rig and I never thought I would have been so picky about noise. If I knew beforehand I would have researched my power supply in terms of audibility much more intensively.

My specs as of now:

CPU: i7-4770k (with stock cooler for now.. will get it replaced with something quieter sometime in the future)
Motherboard: GA-Z87X-UD3H
Hard Drive: 2TB Seagate Barracuda
PSU: XFX Pro 750W Black Edition
GPU: Don't have one yet. Currently running an old XFX GT 240. Looking into getting a GTX 670/760/770 or a Radeon 7950/7970/280x (if they ever come down in price :P )

Looking at reviews on my power supply, one thing I can't seem to wrap my head around is how different reviewers arrived at such starkly different noise levels for the PSU. For example:

http://www.bit-tech.net/hardware/psus/2 ... 20-750w/14 At 500w, my power supply is rated at 18db.

http://www.legitreviews.com/xfx-pro-ser ... iew_2239/7 This review is for the 850w model, but given that the 750w follows the same pattern, at 500w load (66 percent load on the graph) it's rated at ~31db.

Also, the fan on this PSU (adda ad1212mb-a70gl) is rated at 38db (I'm assuming this is @ max load), which resembles the noise graph @ max load in the legitreviews article.

Is there something I'm missing?


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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Tue Jan 07, 2014 4:28 pm 
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Simply put - different sites use different test equipment, use different procedures (1m away vs 70 cm away vs 1ft away, etc) and have different ambient noise environments. Testing for noise is easy to do in a crappy way and very hard to do in a good way.

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1080p Gaming build: i5-4670K, Mugen 4, MSI Z87-G45, MSI GTX 760 2GB Gaming, 8GB 1866 RAM, Samsung Evo 250GB, WD Red 2TB, Samsung DVD burner, Fractal Define R4, Antec True Quiet 140 (2 front + rear) case fans, Seasonic X-560. 35-40W idle, 45-55W video streaming, 170-200W WoW, 200-230W Rift, 318W stress test (Prime95 + Furmark)


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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Tue Jan 07, 2014 11:50 pm 
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100wattwarlock wrote:
If I knew beforehand I would have researched my power supply in terms of audibility much more intensively.


Are you saying that your PSU is actually too much loud?

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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Wed Jan 08, 2014 2:59 am 
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100wattwarlock wrote:
Also, the fan on this PSU (adda ad1212mb-a70gl) is rated at 38db...

Just because the XFX Pro 750w is based on a Seasonic X-750 does not mean that it is one. One difference is the Adda ad1212mb-a70gl fan which is not the same as the one fitted to the X-series. It is the same as the one fitted to Seasonic's G-series and the older ranges such as the MII and SII models. This fan is rated at around 2200 rpm top speed and if you push it much above 50% of PSU capacity it will be noisy.


Another difference is that XFX seem to have adopted a far more aggressive fan profile than Seasonic. But given that XFX's market would primarily be hard-core gamers who would be more worried about cooling than noise, that's understandable. Most gamers would fit the XFX bottom mounted, fan up and given sufficient case airflow this would help limit the temperatures of the PSU and maybe PSU fan noise.


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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Wed Jan 08, 2014 8:58 am 
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CA_Steve wrote:
Simply put - different sites use different test equipment, use different procedures (1m away vs 70 cm away vs 1ft away, etc) and have different ambient noise environments. Testing for noise is easy to do in a crappy way and very hard to do in a good way.


True. Which sites would be considered reliable by SPCR in terms of PSU reviews and audibility?

quest_for_silence wrote:
100wattwarlock wrote:
If I knew beforehand I would have researched my power supply in terms of audibility much more intensively.


Are you saying that your PSU is actually too much loud?


Heh, no. It's fine at current load (the fractal r4 fans are actually louder than I anticipated.. also looking into getting those replaced sometime). My concern stems primarily from the noise I may experience if I add fans (beyond the 2 stock fans), an ssd, and a graphics card (and maybe some LED lights).

Although it has begun to whine..... very annoying. Going to get it swapped with a new one of the same model and hope it doesn't develop the same issue..

Edit: The PSU has not begun to whine. I was mistaken. The HDD is vibrating in the sled it is held in and causing the filter at the bottom of the case to shake (so it sounded like the noise was coming from the PSU). I've since fixed the problem by adjusting the filter although I can still hear the drive vibrating and creating a buzzing noise inside the case.

Edit #2: Thought I'd add this in for anyone who may happen to stumble across this topic when googling fractal r4 and noise/buzzing/HDD issues - the side panel will also vibrate with the HDD to create nose if the panel screws aren't in tight enough.

lodestar wrote:
100wattwarlock wrote:
Also, the fan on this PSU (adda ad1212mb-a70gl) is rated at 38db...

Just because the XFX Pro 750w is based on a Seasonic X-750 does not mean that it is one. One difference is the Adda ad1212mb-a70gl fan which is not the same as the one fitted to the X-series. It is the same as the one fitted to Seasonic's G-series and the older ranges such as the MII and SII models. This fan is rated at around 2200 rpm top speed and if you push it much above 50% of PSU capacity it will be noisy.


Another difference is that XFX seem to have adopted a far more aggressive fan profile than Seasonic. But given that XFX's market would primarily be hard-core gamers who would be more worried about cooling than noise, that's understandable. Most gamers would fit the XFX bottom mounted, fan up and given sufficient case airflow this would help limit the temperatures of the PSU and maybe PSU fan noise.


What's odd is that in the bit-tech review I linked, the XFX Pro 750W Black Edition, Seasonic X-Series 750W, and PC Power & Cooling Silencer MK III 750W were all rated at the same noise levels for 100W, 300W, and 500W loads.


Last edited by 100wattwarlock on Thu Jan 09, 2014 1:50 am, edited 2 times in total.

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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Wed Jan 08, 2014 11:55 am 
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Location: UK
100wattwarlock wrote:
What's odd is that in the bit-tech review I linked, the XFX Pro 750W Black Edition, Seasonic X-Series 750W, and PC Power & Cooling Silencer MK III 750W were all rated at the same noise levels for 100W, 300W, and 500W loads.

XFX's fan control diagram for this PSU (reproduced below) does not suggest that this would be the case.

Image


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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Wed Jan 08, 2014 12:49 pm 
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Joined: Thu Oct 06, 2005 4:36 am
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Um - I think it means 18dBA is the noise floor for Bit-Tech's setup. It doesn't follow that the three supplies are the same in noise level...it's just below what they can measure at 10cm :)

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 Post subject: Re: Opinions on XFX Pro 750w Black Edition PSU
PostPosted: Thu Jan 09, 2014 12:46 am 
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lodestar wrote:
100wattwarlock wrote:
What's odd is that in the bit-tech review I linked, the XFX Pro 750W Black Edition, Seasonic X-Series 750W, and PC Power & Cooling Silencer MK III 750W were all rated at the same noise levels for 100W, 300W, and 500W loads.

XFX's fan control diagram for this PSU (reproduced below) does not suggest that this would be the case.

Image


Thanks for the image. Assuming that RPM is the main/only perpetrator of PSU, then it should still only be marginally louder than 16db at 75% load according to that graph.

CA_Steve wrote:
Um - I think it means 18dBA is the noise floor for Bit-Tech's setup. It doesn't follow that the three supplies are the same in noise level...it's just below what they can measure at 10cm :)


Good point. That would explain a lot. After all, what are the chances 3 different PSUs would output the same audibility across different loads? :P


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