Radeon HD 7850 on 400W PSU

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SnakeGTX

SnakeGTX

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So, i'm going to receive a Asus Essentio CG5275 from my grandparents, and right now its better than any PC i have, so i've been looking into some graphics cards for the machine. So, the ones that i have found that are in my price range ($130) are...

MSI Radeon HD 7850
Sapphire Radeon HD 7790
Sapphire Radeon HD 7770

But the issue is the power supply...
Its only a 400W power supply.
Since the 77's are both about 80W, i would probably get 7790. But then again the 7850 uses 45 more watts so idk.

So could i run a 7850 on a 400W? I've seen videos on youtube, using the 7850 on a 400W or a GTX 660 on a 400W.

I guess it would be safer to get the 7790 but is it worth spending 10 more $ for it? and maybe risking the computer? IDK.

Now the processor is the i5-650.
And i read many posts about bottlenecking and it doesn't seem like it would bottleneck a 7790.
like someone on the forum was using a Athlon II x2 CPU and trying to get a GTX 660, and people in the replies said he wouldn't get that much bottlenecking.

SO, here are the PC specs.

Asus Essentio CG5275
Intel Core i5-650
Asus P7H55 Motherboard
Delta GPS-400BB 400W
8GB DDR3 1333Mhz RAM
1TB Hard Drive 7200RPM
Asus CD/DVD Rom Drive

That's about it, Thanks in advance.
-Shnake
 
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W
I just said the 7750, as it is the most powerful GPU that only draws from the motherboard. No 6 pin required. As I didn't think your PSU had one, I didn't look up it's specs. But clicked on the link in your last post.

Others have powered a 7850 off 400 watts, ok I believe it.
But I recanted, as to do otherwise would be giving you bad advice.
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wdmfiber

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The 400 watt PSU likely doesn't even have a 6 pin connector. Even with just the 7790, your going to need a dual molex to single 6 pin adapter. At 130 watts the 7850 will be wanting up 55 watts via the adapter. It is risky, I'd underclock the GPU a fair bit.

__________
edit:
Actually, I wouldn't do it. You need to get a 7750 or a new PSU(for a more powerful GPU).
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007657%20600014020%20600036427&IsNodeId=1&bop=And&ShowDeactivatedMark=False&Order=PRICE&PageSize=20
Even just a $40 Rosewill. Only 450 watts, but it has a 6 pin and the reviews are positive.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182075
 
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SnakeGTX

SnakeGTX

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Like did you even read my full post? Poeple have ran the 7850 on a 400W.
http://www.youtube.com/watch?v=TEoQP3Q6gSc
GeForce GTX 660 on 400W. And that uses up to 140W.
http://www.youtube.com/watch?v=nf6bNz-PJl4
I'm just wondering if i would get "shutdowns without notice" or the "Blue Screen Of Death" when i'm gaming.

And it does have a 6 pin...
http://www.yycase.com/psu_atx22-400bb.htm

The 7750?! Really? that's a pretty bad GPU... I doubt 30 more watts is going to hurt the system. 85W is pretty low to.

I can see that using the 7850 is probably risky. I mean this computer i'm receiving is like the best gift that i could get. since right now with my PC, i only get about 5-25 fps on minecraft, except that its not steady at all... like every second it dips down to like 5 fps (or lower).
the best PC i have now is the Dell Optiplex 210L (2005).

So i'm going to value this CG5275 greatly. and i would hate to destroy it with a GPU.
I was even getting worried the other night that a 7790 would hurt the system, but now i'm looking at the 7850?!

I'm probably going for the 7790 but i still would like to see the replies.
 
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wdmfiber

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I just said the 7750, as it is the most powerful GPU that only draws from the motherboard. No 6 pin required. As I didn't think your PSU had one, I didn't look up it's specs. But clicked on the link in your last post.

Others have powered a 7850 off 400 watts, ok I believe it.
But I recanted, as to do otherwise would be giving you bad advice.
 
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SnakeGTX

SnakeGTX

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Ok, i gotcha. I thought you were saying that the 7750 is the most powerful GPU i could get with a 400W. Ok, well, thanks for all the advice anyways.
 
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