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Author Topic: Suggestions on Power Supply?  (Read 1856 times)
Nolo
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October 18, 2012, 09:10:59 PM
#1

Most of the threads that address the question that I've found on the subject are quite old. 

So, cutting to the chase, what would be the cheapest solution for a power supply for 4 x 5830s?  (I'm willing to buy used, if someone is selling)

Charlie Kelly: I'm pleading the 5th.  The Attorney: I would advise you do that.  Charlie Kelly: I'll take that advice under cooperation, alright? Now, let's say you and I go toe-to-toe on bird law and see who comes out the victor?  The Attorney: You know, I don't think I'm going to do anything close to that and I can clearly see you know nothing about the law.
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October 18, 2012, 09:19:31 PM
#2

Looks like you just need a 850-900W power supply:

https://bitcointalk.org/index.php?topic=12664.0

this one was recommended in the thread:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050


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October 18, 2012, 11:31:14 PM
#3

do you care about noise? the power supply you choose can make a HUGE difference in how loud the computer is.

i had a 850w thermaltake smartpower unit that was great and put out what i needed for 2x 7950's and an i5, but good lawd it was loud....

I replaced it with a corsair ax850 which is nearly silent with the same load.

that said.. an ax850, xfx 850w (80+ gold) or a seasonic 850w (80+ gold) power supply will do great. Those are all made by seasonic anyway which is an extremely high quality oem.


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October 19, 2012, 01:14:58 AM
#4

It's a bit pricey,but I love mine  Grin

To me its pretty quiet.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817121037&name=Power-Supplies

I ran 2 6970's @ 640 watts,now its running 1 7970 @ 365 watts,on my full gamer/miner rig.I can go to Xfire or SLI later again with no worries.

The aircraft style cables are sweet & the warranty is quick & painless,if you need it.

I had 1 800 watt die out of 6,it was my bad.I was running 720 watts off it for a miner rig,I didn't follow my own rule of thumb & keep a 200 watt buffer.

But they warrantied it & upgraded my 800 watter for that 1000 watter for FREE  Cool

My not do that everytime,but I had trouble with thier warranty page & waited & waited for 2 weeks for "confirmation" to ship mine to them.Finally I called & raised a little cain,they sent me a free ship sticker via UPS & in 8 days they sent the replacement,the NEW 1000 watter  Cool

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October 19, 2012, 02:19:30 AM
#5

do you care about noise? the power supply you choose can make a HUGE difference in how loud the computer is.

i had a 850w thermaltake smartpower unit that was great and put out what i needed for 2x 7950's and an i5, but good lawd it was loud....

I replaced it with a corsair ax850 which is nearly silent with the same load.

that said.. an ax850, xfx 850w (80+ gold) or a seasonic 850w (80+ gold) power supply will do great. Those are all made by seasonic anyway which is an extremely high quality oem.



Nope don't care about noise.  This rig is going to be isolated from the rest of the house.  I'll look at your suggestions.  My biggest concern right now is trying to keep the price as low as possible so I'm willing to sacrifice on frills such as noise level. 

Charlie Kelly: I'm pleading the 5th.  The Attorney: I would advise you do that.  Charlie Kelly: I'll take that advice under cooperation, alright? Now, let's say you and I go toe-to-toe on bird law and see who comes out the victor?  The Attorney: You know, I don't think I'm going to do anything close to that and I can clearly see you know nothing about the law.
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October 19, 2012, 03:33:07 AM
#6

If your not worried about noise just buy anything over 800w from a reliable brand.
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October 19, 2012, 03:49:21 AM
#7

If your not worried about noise just buy anything over 800w from a reliable brand.

http://www.amazon.com/Supply-EPS12V-SLI-ready-PCI-Express-KENTEK/dp/B00596CP9E/ref=sr_1_1?s=pc&ie=UTF8&qid=1350618511&sr=1-1

I'm guessing "Kentek" (whoever that is) is not a reliable brand lol

Charlie Kelly: I'm pleading the 5th.  The Attorney: I would advise you do that.  Charlie Kelly: I'll take that advice under cooperation, alright? Now, let's say you and I go toe-to-toe on bird law and see who comes out the victor?  The Attorney: You know, I don't think I'm going to do anything close to that and I can clearly see you know nothing about the law.
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October 19, 2012, 10:02:04 AM
#8

Cosiar Power Supply is a nice one if you are a miner

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October 19, 2012, 02:37:46 PM
#9

4 x 5830s
= 4x 130w
= 520w
then double it to get in the optimum efficient power range
=1040w

then choose something quality brand name so it lasts many years..

Corsair CMPSU-1050HX Professional Series Silver HX 1050W Power Supply

The 850 watt version should work but would be at 80% efficiency, rather than it's 90% peak.

Budget brands will probably be dead within a year Wink
also sometimes PSU looks cheap but they make you buy the cables for more so it isn't.
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October 19, 2012, 03:05:50 PM
#10

4 x 5830s
= 4x 130w
= 520w
then double it to get in the optimum efficient power range
=1040w
Wth? And double your costs? You don't need to buy a >1kw PSU just to run it at 50% load to maintain optimal efficiency. Those max efficiency numbers are typically good for 40% all the way to 90%, IIRC. It only really starts to drop off at 90-100% load, I believe.

My general rule of thumb for running a PSU constantly is you take the max efficiency, and that's your % of it's max load for how high you can run the PSU for 24/7 usage. A standard 80Plus that's only 80% efficient? I'd only trust it to run it at 80% of it's max load for continuous operations. An 80Plus Platium that's 92% efficient? Lets run it at 92% of max load!

So take your 520W number for the cards, and add 100W for the system.  Lets say you get a 80Plus Bronze PSU (85% efficient). 620W/0.85 = 730W. Find the cheapest 750W PSU by a good brand, and you're all set. This Antec 750W is on sale for $70: http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049

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October 19, 2012, 03:07:51 PM
#11

The optimum efficiency is usually found in the middle of the power range that's why you double your requirement.

near 50% load you should get their 90% efficenent quote
near the bottom or top of the range you will get their 80% certified efficency rating.

$199 v $239 the price difference is $40, is it worth it for 10% more efficiency, depends on your power bills

You get a 7 years warranty with these Corsair PSUs I believe.
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October 19, 2012, 03:14:47 PM
#12

I use this PSU:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817194092&name=Power-Supplies

It powered a watercooled quad 7970 system with a 3770k and lots of fans, it has been mining for 6 months non-stop and has never given me an issue. Even though the breaker in my room has gone out countless times.

Here is a video run through of my rig:

http://www.youtube.com/watch?v=n-A_NlkGvbM


 
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October 19, 2012, 03:16:49 PM
#13

1) To meet the 80Plus Gold requirement, you have to be 90% efficient at 50% load, and 87% at 100% load. It's a 3% different, tops.

2) See this graph:

No discernible drop in efficiency from ~40% load to ~80% load on a 120VAC line (which is what probably most of us are using). Taken from this article:
http://www.anandtech.com/show/2624/3

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October 19, 2012, 03:26:59 PM
#14

Quote
1) To meet the 80Plus Gold requirement, you have to be 90% efficient at 50% load, and 87% at 100% load. It's a 3% different, tops.

You are right, seems the 80 plus certification added more levels, these are now gold rated (mine wasn't) so minimum 87% efficient at 100% load, but im still right most efficient in the middle of the range at 90%. Ok is $40 worth it for an extra 3% efficiency? Probably not. Tongue
http://en.wikipedia.org/wiki/80_Plus

Go for the Corsair HX850 850w Professional Series $149.99 ater $25 rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011&name=Power-Supplies

but if you do want to risk it for some cheap crap uncertified PSU I would still use the double it rule and pray to your god first!

KINGWIN ABT-1050MM 1050W ATX PSU $69.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817121070&name=Power-Supplies
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October 19, 2012, 04:45:37 PM
#15

My original recommendation stands: $70, Antec (decent brand), 750W, 80Plus Bronze. It has 4 Rails, but they're all 40A, so no load issues. Not that you'd have any load issues using 5830s anyways. Also gets good reviews: http://www.anandtech.com/show/4258/antec-hcg-750-gaming-psu/5


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October 19, 2012, 05:38:04 PM
#16

My original recommendation stands: $70, Antec (decent brand), 750W, 80Plus Bronze. It has 4 Rails, but they're all 40A, so no load issues. Not that you'd have any load issues using 5830s anyways. Also gets good reviews: http://www.anandtech.com/show/4258/antec-hcg-750-gaming-psu/5




Great recommendations, and really good discussion in this thread.  I really appreciate the help.  


Edit:  Also, I won't make another thread for such a small question, but anyone know where a person could buy motherboard standoffs locally?  I'm in a good sized city, but I don't have a Frye's or any big box type computer store near me.  And I doubt Best Buy sells those, but anywhere I'm not thinking of?  

Charlie Kelly: I'm pleading the 5th.  The Attorney: I would advise you do that.  Charlie Kelly: I'll take that advice under cooperation, alright? Now, let's say you and I go toe-to-toe on bird law and see who comes out the victor?  The Attorney: You know, I don't think I'm going to do anything close to that and I can clearly see you know nothing about the law.
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October 20, 2012, 05:07:24 AM
#17

My original recommendation stands: $70, Antec (decent brand), 750W, 80Plus Bronze. It has 4 Rails, but they're all 40A, so no load issues. Not that you'd have any load issues using 5830s anyways. Also gets good reviews: http://www.anandtech.com/show/4258/antec-hcg-750-gaming-psu/5




Great recommendations, and really good discussion in this thread.  I really appreciate the help.  


Edit:  Also, I won't make another thread for such a small question, but anyone know where a person could buy motherboard standoffs locally?  I'm in a good sized city, but I don't have a Frye's or any big box type computer store near me.  And I doubt Best Buy sells those, but anywhere I'm not thinking of?  

amazon has them.. $5 for 15

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October 29, 2012, 08:59:03 PM
#18


I have 5 or 6 rigs with this PSU.  Running 4 5830/50/70s
I've had to purchase SATA to PCIe adapters from Meritline to be able to run each pcie port off it's own cable.  I don't like running multiple pcie ports off the same cable.

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October 30, 2012, 01:22:53 AM
#19

Rosewill's (newegg.com store brand) CAPSTONE, FORTESS, and LIGHTNING lines using AMAZING OEM's (Superflower comes to mind). Their quality is top notch and is often much less expensive than other major brands such as Corsair and Enermax. Also they are all single 12v rail, which is the best for GPU mining (No more locked out power or delicate load balancing. Just plug in and go). If you look up reviews for these power supplies, you will find nothing other than OUTSTANDING reviews. I suggest looking them up.

I have a Rosewill Lighting powering TEN gpu's total (5 x 5970) and it doesn't even break a sweat. The exhaust air that comes out is barely warm too, which means there is a significantly smaller amount of electricity being wasted to AC-to-DC inefficiency. Gotta love 80PLUS GOLD and 80PLUS PLATINUM ratings. I also have 2 CAPSTONE 450W's powering 2 spare PCs, all of which are mining. All my Rosewills are also SILENT, even the 1300W, or I imagine it is, since I can't hear it above the fans of the radeon 5970's.

FWIW, I am powering 2 Radeon 5870 @ 1.03v from a 450W CAPSTONE and my kill-a-watt shows 315 watts at the wall.

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November 07, 2012, 07:08:43 AM
#20

http://www.newegg.com/Product/Product.aspx?Item=N82E16817703028

I'd go with this. Good efficiency, plenty of wattage, decent pricepoint. Of 84 reviews, 76 give it an 'excellent' rating. PC Power & Cooling is a quality brand. It's only 1% off from being Gold certified.
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