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Will this PSU run this AMD HD 4870?

Last response: in Components
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March 16, 2012 12:49:59 PM

I currently have an Antec 400w-HCG and am looking to buy a 4870 from my friend.
I was just wondering if that psu would be able to run it.
I know it only has 1 6-pin pci-e cable, but he said there were "extra" cables. Is this just a lie?

If this PSU isn't good what would you recommend?

I was currently looking at something like this - OCZ ModXStream Pro 600W Power Supply

Or maybe this - OCZ ZS-Series 550 Watt 80PLUS Bronze Performance Power Supply

Oh yea and try to keep it under 50 dollars

Thanks

More about : psu run amd 4870

March 16, 2012 1:06:52 PM

Depends what the rest of the system is, but generally I would say get at least 500w.
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March 16, 2012 1:12:48 PM

Too lazy to type everything :/ 
so here are the screenshots from cpu-z
http://imgur.com/a/wcRi9#0

but will that antec 400w-HCG run it? because he's giving me a deal, that psu and gpu for $80
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a c 87 ) Power supply
March 16, 2012 2:15:24 PM

Is he currently using them both? Meaning its working right now?

Its really close. I don't know how much the 400W HCG can output on the 12v rail(s), but assuming it can do nearly all of it then it can supply up to around 33A. Assuming a normal system and no OCing you'll be able to do it. With the poor PSU running at/nearly 100% every time you play a game. You'd be better off getting a better PSU.
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a c 87 ) Power supply
March 16, 2012 2:53:03 PM

To get the second 6pin PCIe connector you would have to use two 4pin peripheral connectors and connect those to a peripheral to PCIe adapter (as explained here), leaving you with only two periperal connectors.

http://www.techpowerup.com/reviews/HIS/HD_4870_IceQ4/27...
Shows a system with an i7-920 (which is probably more power hungry than a Q6600) and a factory OC'd 4870 drawing 293W peak from the wall under 3DMark03. So based on that yes a good 400W PSU should be able to handle it.

The HCG-400W has 30A on it's 12V rail.
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March 17, 2012 12:30:10 AM

4745454b said:
Is he currently using them both? Meaning its working right now?

Its really close. I don't know how much the 400W HCG can output on the 12v rail(s), but assuming it can do nearly all of it then it can supply up to around 33A. Assuming a normal system and no OCing you'll be able to do it. With the poor PSU running at/nearly 100% every time you play a game. You'd be better off getting a better PSU.


Yes he currently is using them both, i don't know what his specs are, but i know hes overclocked parts, so i assume i should be able to run it with my stock everything.
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March 17, 2012 12:31:12 AM

Silvune said:
To get the second 6pin PCIe connector you would have to use two 4pin peripheral connectors and connect those to a peripheral to PCIe adapter (as explained here), leaving you with only two periperal connectors.

http://www.techpowerup.com/reviews/HIS/HD_4870_IceQ4/27...
Shows a system with an i7-920 (which is probably more power hungry than a Q6600) and a factory OC'd 4870 drawing 293W peak from the wall under 3DMark03. So based on that yes a good 400W PSU should be able to handle it.

The HCG-400W has 30A on it's 12V rail.


Thanks, so it's an OK on the combo? and is $80 a good price for the two?
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a c 87 ) Power supply
March 17, 2012 12:42:52 AM

If a system using that card needs 300W and it has 30A, then you have a total of 360W available. With only 60W to spare I wouldn't do any OCing. Use it as he is, but I'd upgrade that PSU as soon as possible.
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a b ) Power supply
March 17, 2012 1:47:06 AM

Hi :) 

Yes....

All the best Brett :) 
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a c 87 ) Power supply
March 17, 2012 12:42:21 PM

4745454b said:
If a system using that card needs 300W and it has 30A, then you have a total of 360W available. With only 60W to spare I wouldn't do any OCing. Use it as he is, but I'd upgrade that PSU as soon as possible.

300W at the wall, which means 10-20% can be taken off that number to account for the efficiency of the PSU and power being wasted in the process of power being converted from AC to DC. So it is more like 90W. But again an i7-920 is more power hungry than a Q6600, so it is probably more than 100W of 'headroom'.
Stress/torture testing is something I would avoid as well, except to make sure that it does work.

jason_1234 said:
Thanks, so it's an OK on the combo? and is $80 a good price for the two?

Yes I think it is.
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March 17, 2012 12:47:01 PM

So far I can purchase it for $80, the graphics card and psu. I'm waiting for a reply on how much for just the graphics card. If its like $50 or under would it be better to purchase one of the power supplies listed above?

(here they are)

OCZ ModXStream Pro 600W Power Supply - http://www.canadacomputers.com/product_info.php?cPath=3...

OCZ ZS-Series 550 Watt 80PLUS Bronze Performance Power Supply - http://www.canadacomputers.com/product_info.php?cPath=3...

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a c 87 ) Power supply
March 17, 2012 12:51:16 PM

I didn't read the link, are you sure? Most of the time when sites like the power draw they list the actual draw. Meaning they've already took efficiency into account. From what I know of the 4870 300W is a normal draw for a system.
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March 17, 2012 12:54:15 PM

4745454b said:
I didn't read the link, are you sure? Most of the time when sites like the power draw they list the actual draw. Meaning they've already took efficiency into account. From what I know of the 4870 300W is a normal draw for a system.


So it's not worth the extra 10 dollars for a 600W/550W? because they are on sale w/ rebate for 40, Would it just be extra useless power?
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a c 87 ) Power supply
March 17, 2012 1:24:26 PM

It might be worth it.

The system will only draw whats needed. If the system needs 300W, then 300W is all the PSU will send. The problem is if your PSU can only safely send 360W, then you are very close to the limits of what the PSU can do. This usually means extra heat as the PSU is working harder, and possible shorter life span. If your PSU can safely output 500W, then it has a better change of lasting longer, probably puts out less heat, and will be more efficient.

PSUs tend to be most efficient working between 40-80% of their rated output. (50-60% tends to be the highest.) A 400W PSU might be only 80% efficient supplying 300W of power, while a 500W PSU might be 85%. If so, then the 500W PSU will be pulling less power from the wall meaning it's saving you $$$.
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March 17, 2012 1:37:07 PM

well, if he offers just the graphics card for 50 or so, i will go for one of the power supplies listed above. What would you go for?

The 600W modular 80+ certified - 86% efficiency at typical load - 82% at full load

OCZ ModXStream Pro 600W Power Supply

or

The 550W non-modular 80+ Bronze certified - 85% efficiency at typical load - unknown at full

OCZ ZS-Series 550 Watt 80PLUS Bronze Performance Power Supply

EDIT: He is going to give me the card for $50
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a c 87 ) Power supply
March 17, 2012 4:49:51 PM

4745454b said:
I didn't read the link, are you sure? Most of the time when sites like the power draw they list the actual draw. Meaning they've already took efficiency into account. From what I know of the 4870 300W is a normal draw for a system.

Yes I am sure. And in my experience review sites when they list system power consumption are doing so for the mains power draw.
Quote:
In order to characterize a video card's power consumption, the whole system's mains power draw was measured.


The OCZ ZS series has quite long cables, so if you have a large case and care about routing cables behind the motherboard then go for that. While the cables on the ModXStream Pro are quite short, but has the advantage of being modular. I can't really separate them beyond that.
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March 17, 2012 4:51:36 PM

Silvune said:
Yes I am sure. And in my experience review sites when they list system power consumption are doing so for the mains power draw.
Quote:
In order to characterize a video card's power consumption, the whole system's mains power draw was measured.


The OCZ ZS series has quite long cables, so if you have a large case and care about routing cables behind the motherboard then go for that. While the cables on the ModXStream Pro are quite short, but has the advantage of being modular. I can't really separate them beyond that.


and how about the zt series?
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March 17, 2012 4:54:11 PM

And just one last thing, could someone give a quick review on how the rebate would work?
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a c 87 ) Power supply
March 17, 2012 9:38:48 PM

Cables lengths are better on the ZT series, so functionally you get the best of both. Again I think in terms of quality and performance it is fairly even with the ZS series.

Maybe you want to read some reviews for your self:
ZS Series 550W: http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
ZS Series 650W: http://www.hardwaresecrets.com/article/OCZ-ZS-Series-65...

ZT Series 750W: http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
ZT Series 650W: http://www.hardwaresecrets.com/article/OCZ-ZT-Series-65...

I don't live in the US and we don't have rebates here (UK) so I don't know how they work.
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March 17, 2012 11:19:10 PM

Thanks to everyone for the help :) 

But i've decided to go with his psu.
It turns out that the rebates are horrible, and i want to stay away from anything that is gonna cost me my precious time.

I wish i could give best answer to you all so i have to choose one when i am finished reviewing the comments.

Thanks again
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March 17, 2012 11:20:27 PM

Best answer selected by jason_1234.
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