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PSU for HD 4890

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  • Antec
  • HD
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Last response: in Graphics & Displays
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a b U Graphics card
October 25, 2011 1:21:51 AM

I'm getting a free HD 4890 from a friend, and so I'm also shopping for a better PSU. Newegg has a sale on this one, and I'm wondering if it will do the trick in my system.

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

Antec's PSU calculator says the wattage is okay, and a review of the HD 4890 says I'll need 32 amps on the 12v rails.

More about : psu 4890

a b U Graphics card
October 25, 2011 1:35:14 AM

I doubt this PSU will work for you unless it delivers the full 33 amps. on the 12v rails. You may want to check www.jonnyguru.com or www.hardwaresecrets.com for a review of this exact model PSU and see what they show for 12v rail power on the two combined 12v rails.
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Best solution

October 25, 2011 1:37:18 AM

You would probably be ok with that but you may want to consider the 500W version, a little more money up front but only $5 more expensive after rebate.

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

There's also this 550W that should fit the bill and again, only slightly more expensive after rebate.

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

I have the 4890 in my system currently (waiting for the new ones at the end/beginning of the year) and I remember it calling for a 500W or better PSU when I bought it. Just a thought.
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a c 177 U Graphics card
October 25, 2011 2:00:44 AM

Guys, the 380W version of that PSU will handle his system. I'd probably get the 500W version because after rebate they are the same price.
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a b U Graphics card
October 25, 2011 2:48:24 AM

4745454b said:
Guys, the 380W version of that PSU will handle his system. I'd probably get the 500W version because after rebate they are the same price.


+1. that PSU is more then capable
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a c 376 U Graphics card
October 25, 2011 3:08:13 AM

HD4890 is a bit of a beast power wise. It can use over 200w, close to 250w if you overclock. Certainly wouldn't try to run it on the 380w myself. The 430w may work but you'd be pushing it pretty hard which is generally not a good idea.
I'm not seeing many good PSU deals on newegg right now. I'd probably go for this;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
or this if the rebate doesn't matter to you;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Don't be confused by the 520w vs 600w, they both have the same amount of power on the +12v rail which is what matters.
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a c 143 U Graphics card
October 25, 2011 4:05:48 AM

jyjjy said:
HD4890 is a bit of a beast power wise. It can use over 200w, close to 250w if you overclock. Certainly wouldn't try to run it on the 380w myself. The 430w may work but you'd be pushing it pretty hard which is generally not a good idea.
I'm not seeing many good PSU deals on newegg right now. I'd probably go for this;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
or this if the rebate doesn't matter to you;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Don't be confused by the 520w vs 600w, they both have the same amount of power on the +12v rail which is what matters.

+1
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a c 177 U Graphics card
October 25, 2011 6:48:22 AM

250W? The PSU that the OP linked in the OP can do 384W on the 12V rails, more then 100W then a system with the 4890 will use. How big of a buffer do you want him to have??? I think the 380W will do 29A (don't remember) which is 348W. Exactly how much overkill do you want him to have?
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a b U Graphics card
October 25, 2011 11:43:22 AM

Yeah, really wasn't planning on overvolting at all, or spending more than $50 on a new PSU. And how could the card use over 225w when it's only plugged in to two 75w six-pin connectors? I don't think I'll be pushing the 430w PSU to its limit, but I might get the 500w Earthwatts if there's a really good reason.
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a c 177 U Graphics card
October 25, 2011 12:29:14 PM

System, not card. First, keep in mind that the card can draw up to 75W from the PCIe slot as well. So its total possible draw is up to 225W. Going from this site the maximum power draw for this card is 190W.

http://hothardware.com/Reviews/PowerColor-Radeon-HD-489...

Assuming that's the case, and adding another 100W for the CPU and up to 50W for the rest of the system, you're looking at around 340W max. That sounds really high to me for some reason. 380W might not be enough, the original linked PSU should be fine however.
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a b U Graphics card
October 25, 2011 12:40:36 PM

jessterman21 said:
Yeah, really wasn't planning on overvolting at all, or spending more than $50 on a new PSU. And how could the card use over 225w when it's only plugged in to two 75w six-pin connectors? I don't think I'll be pushing the 430w PSU to its limit, but I might get the 500w Earthwatts if there's a really good reason.

It'll give you more overhead, and the pair of 6 pin power connectors needed for the card, for the same money after the rebate.
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a b U Graphics card
October 25, 2011 2:14:21 PM

I won't be overclocking, and probably not replacing my 65w cpu with a 95w Phenom II X4 until I upgrade my card to an HD 7850 or so. (The HD 4890 was a happy and unexpected stop-gap solution for the games I own, while I'm saving to upgrade to a more powerful 100-150w current/next-gen card.) So I'll save myself the hassle of waiting an eternity for a rebate gift card.

And check this out, everyone:

http://www.tomshardware.com/reviews/phenom-ii-overclock...

I'm positive my 65w + 190w setup will not draw more wattage than Tom's overclocked build. (125w cpu + 150w gpu)
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a b U Graphics card
October 25, 2011 3:07:33 PM

If you want to objectively, accurately and scientifically determine what PSU power is required for your Vid card and PC in both watts and 12v rail amps., the forum Utility link below will show you how easy it is to calculate this information and objectively determine which PSUs are quality built, reliable PSUs that can meet your needs.

http://www.tomshardware.com/forum/314712-28-please-read...
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a c 143 U Graphics card
October 25, 2011 3:53:42 PM

So again, as i said in the other thread, let's assume the following and do some math
the OP has
CPU (high end quad core overclocked) consumes 141W
RAM 2 sticks each consume 4 = 8W
say OP has 2 HDDs = 20W
2 ODD = 16W
Add in card = 8W
5 fans including CPU = 15W
MOBO OCed = 55W
GPU 200W (maximum power board for the HD 4890, Not OCed)
Total = 463W

So basically a 380W PSU wouldn't help

The OP might not have the above configuration, so technically a 380W PSU should work just fine but it will be pushed to the limits, the PSU will work hardly 24/7 which will cause the capacitors & Coils to heat up and the PSU will crack immediately.

And as i said in the other thread, diff PSUs don't deliver the same wattage to each system..


Thanks to dirtyferret for pointing me to the source ( http://www.tomshardware.com/review [...] 916-7.html )
Someone correct me if i'm wrong.
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a c 177 U Graphics card
October 25, 2011 4:17:42 PM

The problem is that your assuming 122W for the rest of the system. That is an amazing amount of power. Here is a review of the 4890.

http://www.guru3d.com/article/radeon-hd-4890-review-tes...

Notice they hit a max of 370W, less if your not OC'ing. I already said you shouldn't use the 380W, the 430W is fine. Use the 500W Domin linked seeing as it's the same price.
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a c 107 U Graphics card
October 25, 2011 4:19:28 PM

That PSU is good enough for the 4890 and looking at your sig the rest of your system shouldn't use too much power. You'll be more than fine with that PSU. My only issue is that you only have one PCI-E connector on that PSU so you will have to use a 6-pin to molex adapter for it. For that reason I would go with the 500W version of that PSU

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a c 143 U Graphics card
October 25, 2011 4:32:43 PM

4745454b said:
Notice they hit a max of 370W, less if your not OC'ing. I already said you shouldn't use the 380W, the 430W is fine. Use the 500W Domin linked seeing as it's the same price.

I saw a lot of reviews and i know how the HD 4890 consumes power, but taking the assumption of overclocking CPU, GPU required me to remove the idea of getting even a 430W PSU.

Anybody should add plenty of wattage to his needs in case of future upgrade.
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a b U Graphics card
October 25, 2011 7:40:44 PM

Okay, well I won't be consuming that much wattage, since I have a 65w CPU, 1 SATA HDD, 1 case fan, 4 sticks of DDR2, 1 DVD drive, a non-overclockable Dell mobo, and no additional PCI cards... The only upgrade I plan is a non-overclocked 95w Phenom II X4 (mobo cannot handle more), and a GPU that requires only 1 power cable. But +1 for the link, beenthere - even the strong 430w Earthwatts doesn't have much amperage headroom. Annnnnd I found $10 in my wallet.

This card was a gift, so I said SURE - 50% more performance for free? Sign me up! Anyways thanks for all your help - I'm getting the 500w Earthwatts b/c of the amperage headroom in case I decide to clock the mess out of the 4890.
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a b U Graphics card
October 25, 2011 11:18:43 PM

Best answer selected by jessterman21.
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