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Will this PSU be enough?

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a b U Graphics card
May 31, 2011 4:04:12 PM

Just a quick question to throw your way here. I am going to get a new GPU here soon. Probably a HD 6950 that I will Xfire in the future. That being said, I definitly need to upgrade my PSU to be able to handle it. My question is, would http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018 This PSU be able to handle the HD 6950's in xfire? I know that there are some better PSU's out there, but the price with the MIR is unbeatable.

I run a ASUS M4A88TD-V EVO, Phenom II x2 unlocked tgo 4 cores O.C. 3.6ghz right now on a 550W PSU. I would also probably upgrade to a Bulldozer 4 core cpu down the line as well.

It is either that PSU or some of these others:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817322015

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

http://www.newegg.com/Product/Product.aspx?Item=N82E16817322008

Let me know what you think!

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a b U Graphics card
May 31, 2011 4:11:38 PM

I like the Corsair:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Any of those would work though I would only trust the Corsair or the OCZ, and I would go with the Corsair.* They are one of the best if not the best PSU company on the market right now... Any that yo choose, remember to make sure they have enough 6-pinners (2 Per GPU)...

*(Edit) It is somewhat complicated, but some PSU's are not as efficeint as others which means that they do not feed the labeled power. Corsair has also been known for understating their PSU's wattage capacity (Not sure about that model though). Plus if you buy them, you really wont have to worry about amps/volts/ect and rails as they keep high ratings on all of them.
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May 31, 2011 4:25:23 PM

http://www.eggxpert.com/forums/thread/323050.aspx
A nice reference, if XFiring you will want an efficient, and reliable PSU (tier 1 or 2)

I can't speak on your ability XFire with the future CPU upgrade because I don't know much about the specs on the Bulldozer series of CPU's, though I can say that 750w has been the safe bet for quite a while so it may not hurt to go with that.
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a b U Graphics card
May 31, 2011 8:29:08 PM

I have tried putting information in ALOT of websites that supposedly "tell" you how many watts you will be needing in a system. I have gotten responses from 571w with dual 6950's all the way upu to 1100w. I don't know what to think anymore :( 

Would a good 650w (corsair, antec, ect.) work to xfire the 6950's? Or should I stick to the 750w numbers?
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a b U Graphics card
May 31, 2011 9:13:54 PM

The 650 Corsiar SHOULD get you through Crossfire... IF you want to have extra breathing room, get the 750...
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May 31, 2011 10:41:45 PM

I would say go with the 750 because you definately want the extra headroom in case you are overclocking.It never hurts to have more than enough but it stinks when you are in the middle of a game and you start to experience difficulties because the cards simply do not have enough power.Go with either silver or gold rated...
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a c 175 U Graphics card
June 1, 2011 12:27:37 AM

I don't like any of those. The 6950 requires two PCIe plugs, so for a CF setup you'll need four of them. Only those no name models you listed have that many. Even that 650W Corsair only has two. Sure you could use adapters, but if they wanted the PSU hooked up in such a way they would have sent it to you like that. Try this one.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Antec EA750W. $80 shipped, no rebate. And it has the four connecters you need.
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a b U Graphics card
June 1, 2011 12:53:57 AM

jsc's SWAG (Scientific Wild Assed Guess):
A pair of 6950's pulls about 25 amps (300 watts). Figure 10 amps for a CPU. That's about 420 watts right there. Figure another 100 watts for motherboard and memory.
Figure 50 watts for a couple of hard drives and one optical.

That's about 570 watts. A 650 watt PSU with a 50 amp 12 volt rail would work. I'd use a good 750 watt PSU.
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a c 175 U Graphics card
June 1, 2011 1:34:10 AM

Yikes! That is WA. You really think a mobo with ram is pulling 8A? Even with a power hungry Nvidia chipset I've only seen them pull around 40W. And thats if you have a NB and SB. Drives also only pull about 7W, and that's at startup. Two drives and an optical should be around 15-20W.
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a b U Graphics card
June 1, 2011 1:57:50 AM

phishy714 said:
Just a quick question to throw your way here. I am going to get a new GPU here soon. Probably a HD 6950 that I will Xfire in the future. That being said, I definitly need to upgrade my PSU to be able to handle it. My question is, would http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018 This PSU be able to handle the HD 6950's in xfire? I know that there are some better PSU's out there, but the price with the MIR is unbeatable.

I run a ASUS M4A88TD-V EVO, Phenom II x2 unlocked tgo 4 cores O.C. 3.6ghz right now on a 550W PSU. I would also probably upgrade to a Bulldozer 4 core cpu down the line as well.

It is either that PSU or some of these others:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817322015

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

http://www.newegg.com/Product/Product.aspx?Item=N82E16817322008

Let me know what you think!

Phishy,

I would encourage you to go with, at least, an 850W PSU from Anec, Corsair, or Seasonic. The reason for the overkill on a PSU is that it gives you for headroom for Xfire orSLI and you won't need to get a new PSU to do it.

My only regret with the Corsair 650W TX that I bought is that it doesn't give the head room for SLI, but that wasn' the original plan. And I also had budget limitations.

Here are some alternatives that I'd consider for my own rig:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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a c 175 U Graphics card
June 1, 2011 3:52:37 AM

How do you figure he doesn't have enough for CF or SLI? The one I linked should be fine for CF. Sure you can get another one that has a higher efficiency, but that 750W should do the job, even in CF.
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a b U Graphics card
June 1, 2011 10:44:33 AM

I didn't say that your suggestion was inadequate. My point is that the 850W give more room for expansion. I'd rather have a larger reserve than maxing out a PSU & having to replace it. 750W is fine if you aren't planning on future expansion with other peripherals.
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a c 175 U Graphics card
June 1, 2011 10:58:09 AM

Perhaps. But if a 600 or 650W could do it but shouldn't because your cutting it close, how much buffer do you need? I can see going from a 650W that could to a 750 that can. Not sure I see going to an 850W just in case/because.
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a b U Graphics card
June 1, 2011 1:22:06 PM

4745454b said:
Perhaps. But if a 600 or 650W could do it but shouldn't because your cutting it close, how much buffer do you need? I can see going from a 650W that could to a 750 that can. Not sure I see going to an 850W just in case/because.

If he adds a HDD here, a sound card there, and another peripheral down the road he may be OK with the 750W PSU. But if the differnece is $20-$30 for an 850W PSU does he want the insurance of more power?

The specs for the Bulldozer are a minimum 125W, and depending on the model he upgrades to, may be more (135W-140W). Dual GPU's at stress probably pull 175W + apiece. Other peripherals probably around 50W-60W.

I would say that JSC's estimate of 570W is about correct. An 850W PSU will have no problems, and a lot of watts to spare. Noise will be very good, because you are not stressing the PSU.

A 750W PSU may show stress (especially if the rating is fudged). If it is stressed it will become noisy and start to show wear from high heat.

A 650W PSU will definitely show stress and get noisy.

Ultimately the choice is Phishy's. I know what choice I'd make.

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a b U Graphics card
June 1, 2011 1:33:58 PM

phishy714 said:
I have tried putting information in ALOT of websites that supposedly "tell" you how many watts you will be needing in a system. I have gotten responses from 571w with dual 6950's all the way upu to 1100w. I don't know what to think anymore :( 

Would a good 650w (corsair, antec, ect.) work to xfire the 6950's? Or should I stick to the 750w numbers?




Anand reports total system load with a 6970CF in Furmark at 601w -- 6950CF at 509w




750w at 80% efficiency equals 600w
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a b U Graphics card
June 1, 2011 1:46:23 PM



Lol I got distracted by the pretty colors and kept thinking holy crap the 6950 by itself is pulling more watts than my currect psu is putting it out. So this means that I can get a nice 750W and be just fine in CF? I am thinking of either http://www.newegg.com/Product/Product.aspx?Item=N82E16817371026 or http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

I am leaning towards the Corsair cause well.. its Corsair. However, I do also like the fact that the Antec (a very good psu as well) is a continuous 750W, cheaper, and semi modular. One thing I have read is that people like having a single +12V Rail compared to multiple. Anyone know why this is better and what that would affect in a CF design?
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a c 175 U Graphics card
June 1, 2011 3:12:53 PM

Quote:
750w at 80% efficiency equals 600w


I would believe you more if you got that right. 750W output at 80% efficiency means its pulling 938W from the wall. Review what efficiency means.

Quote:
If he adds a HDD here, a sound card there, and another peripheral down the road he may be OK with the 750W PSU. But if the differnece is $20-$30 for an 850W PSU does he want the insurance of more power?


Why stop there? I bet you could find a 1kW PSU for not much more then 850W. The OP knows his possible upgrades better then we do. Not saying the 850W is the wrong move to make. But you do reach a point where you are spending $$$ that either doesn't need to be spent, or could be spent on other things.

The Antec you posted can get the job done, but the Corsair is the better buy. It's only a few $$$ more after rebate, but its more efficient and has more usable power. For the extra $7, I'd get it over the Antec.
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a b U Graphics card
June 1, 2011 3:35:44 PM

phishy714 said:
Lol I got distracted by the pretty colors and kept thinking holy crap the 6950 by itself is pulling more watts than my currect psu is putting it out. So this means that I can get a nice 750W and be just fine in CF? I am thinking of either http://www.newegg.com/Product/Product.aspx?Item=N82E16817371026 or http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

I am leaning towards the Corsair cause well.. its Corsair. However, I do also like the fact that the Antec (a very good psu as well) is a continuous 750W, cheaper, and semi modular. One thing I have read is that people like having a single +12V Rail compared to multiple. Anyone know why this is better and what that would affect in a CF design?


The furmark power chart is SYSTEM power draw, taking into account everything else, not just the GPU. Assuming for each of the cards tested the system remained identical, it gives an accurate overall differentiation at the system level.

I too lean to Corsair at the high end, their HX and AX series, despite expensive, are the best. I've never had any problems with any of the unit's i've used. The other brand i'd recommend at 1KW+ is Enermax Revolution 85+ 1050W.
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a b U Graphics card
June 1, 2011 3:45:22 PM

4745454b said:
Quote:
750w at 80% efficiency equals 600w


I would believe you more if you got that right. 750W output at 80% efficiency means its pulling 938W from the wall. Review what efficiency means.

Quote:
If he adds a HDD here, a sound card there, and another peripheral down the road he may be OK with the 750W PSU. But if the differnece is $20-$30 for an 850W PSU does he want the insurance of more power?


Why stop there? I bet you could find a 1kW PSU for not much more then 850W. The OP knows his possible upgrades better then we do. Not saying the 850W is the wrong move to make. But you do reach a point where you are spending $$$ that either doesn't need to be spent, or could be spent on other things.

The Antec you posted can get the job done, but the Corsair is the better buy. It's only a few $$$ more after rebate, but its more efficient and has more usable power. For the extra $7, I'd get it over the Antec.



Alrighty, I am sold. Thank you so much for your help guys!

One last question however. I see another Corsair 750W psu on newegg that is on sale. Looking at it, it looks like the version 1 compared to the version 2.

Basically http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021 at 109 (99 after mir)

vs

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006 at 95 (80 after mir)

Happen to know the biggest difference between the two and if $15 is worth it? Thanks again!
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a c 175 U Graphics card
June 1, 2011 4:42:52 PM

Newer version has 2 more Amps on the 12V rail, and is 80 bronze instead of just 80 certified. This means its more efficient, and will cost you less electricity. Not sure where you get $80 after MIR, I see $95 after MIR. Considering that the newer better version is only $5 more, I'd get that one.
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a b U Graphics card
June 1, 2011 4:51:59 PM

Oh if you look at the email deals in the front page, its there and gives you another $15 off instantly with a discount code. That's why its in fact about $20 cheaper after mir. Still think the newer version is worth that?
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a c 175 U Graphics card
June 2, 2011 12:49:54 AM

I don't see it still, but then I'm not the one who needs to. If it was in the 24hr sale section it might be to late. At $80 for the older one it's more of a bargain, but I'd still get the newer one if I could afford it.
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a b U Graphics card
June 2, 2011 12:20:55 PM

Best answer selected by Phishy714.
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a c 273 U Graphics card
June 2, 2011 9:34:55 PM

This topic has been closed by Mousemonkey
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