SOLVED Seasonic X750 enough for CF 290s

ninjacore · Nov 23, 2014

Wondering if I add another 290, will my x750 (gold rated) keep up?

From what I've read, I should expect no more than 700w draw. Do I need to worry about spikes, though?

Thanks

EDIT: After much fruitful (and some fruitless) debate, I think a gold-rated 750w would be enough to power two 290s in their stock configuration, but I'd be running them a little closer to the edge than I'm comfortable with. I bumped up to the EVGA Supernova 850 B2. Should give me some room later if I ever have the need to overclock the cards.

Mandrake4565 · Nov 23, 2014

It should be plenty, even overclocked. Your looking at near 700w draw with both the Cpu and Gpu's Oced and running at 100%, the 12v rail is 744w. Unless you're doing some extreme benchmarking it's doubtful you'll be running both cards and the cpu at 100%, so the power draw will be less then 700W.

Witchdoctor · Nov 23, 2014

To close to the bone for me. I think an 850 would be the sweet spot for a grinder, if pounding on them hard 1K

ATMINSIDE · Nov 23, 2014

Should be just fine, that's a good PSU

Mr.Scott · Nov 23, 2014

I agree with the Witchdoctor. I like a little cushion.

manu2b · Nov 23, 2014

I am with Witchdoctor and Mr. Scott.

Get a 850w at least if you plan on any OC on the GPU's.

With the 50% extra power, each card will hit more than 350w on load.

My 2*290X's@1150/1500 and a [email protected] were pulling more than 950w from the wall on full load (benchmarking, gaming no vsync) with a 1000W 80+ bronze PSU.

You can count on 850W+ with a couple of 290's.

Mandrake4565 · Nov 23, 2014

Witchdoctor said:
To close to the bone for me. I think an 850 would be the sweet spot for a grinder, if pounding on them hard 1K

Mr.Scott said:
I agree with the Witchdoctor. I like a little cushion.

I also agree with both of you guys if benching but for daily usage ie gaming?

manu2b · Nov 23, 2014

Yes, including gaming.

The cards only at 100% with the +50% power limit are already around 700.

Mandrake4565 · Nov 23, 2014

manu2b said:
Yes, including gaming.

The cards only at 100% with the +50% power limit are already around 700.

Didn't realize the power limit on them was so high. Thanks Manu

ninjacore · Nov 23, 2014

Looks like what I read earlier must have been incorrect.

This review says 750+ draw:

http://www.legitreviews.com/xfx-radeon-r9-290-crossfire-video-card-review-at-4k-ultra-hd_139418/11

Guess I'm looking for an 850

manu2b · Nov 23, 2014

Mandrake4565 said:
Didn't realize the power limit on them was so high. Thanks Manu

Oh yes! These ones heat up your room really fast!

manu2b · Nov 23, 2014

ninjacore said:
Looks like what I read earlier must have been incorrect.

This review says 750+ draw:

http://www.legitreviews.com/xfx-radeon-r9-290-crossfire-video-card-review-at-4k-ultra-hd_139418/11

Guess I'm looking for an 850

And that's before any kind of overclocking...

ninjacore · Nov 23, 2014

So here's what I've dug up:

(rebates, coupons and shipping factored into the prices)

Antec HCG-850M @ Egg for $80

XFX Core 850 @ TD for $95

EVGA Supernova 850 B2 @ Egg for $97

Corsair HX850 @ Egg for $110

I'm assuming there are better options out there. Can someone point me in the right/best direction?

Thanks again

ATMINSIDE · Nov 23, 2014

Guys, that power draw is from the WALL for the SYSTEM.

With a 743W peak, assuming 85% efficiency, the PSU is supplying 631W.
ninjacore, don't waste money.

manu2b · Nov 23, 2014

^750W is not enough for 2x290 overclcoked.

that 631W at stock.

With oC an power limit set to +50%, you are reaching 700W for the GPU's only.

Edit: I was pulling 950W+ from the wall with 2x290X's. Count a hundred W less at max for 2 290's

manu2b · Nov 23, 2014

Have a look here:
http://www.anandtech.com/show/7601/sapphire-radeon-r9-290-review-our-first-custom-cooled-290/5

Witchdoctor · Nov 23, 2014

I would go with the Seasonic from XFX

ATMINSIDE · Nov 23, 2014

manu2b said:
^750W is not enough for 2x290 overclcoked.

that 631W at stock.

With oC an power limit set to +50%, you are reaching 700W for the GPU's only.

Edit: I was pulling 950W+ from the wall with 2x290X's. Count a hundred W less at max for 2 290's

Okay? So you were pulling approximately 800W from your PSU.
Count 100W less for 290's, and you're at 700W.

Still 50W to the good.

As I said, he's just fine.

manu2b · Nov 24, 2014

^ you know it all, that's okay with me.

Maybe you should read some reviews, as I don't believe you have any experience with theses GPU's... At least from what I've seen on your Hwbot profile.

ninjacore · Nov 24, 2014

To be fair, your experience is with the 290Xs, manu, so neither do you

With efficiency, do I just multiple the percentage by the total consumption to get what is actually being asked of the PSU?

Sounds like either it'd be close either way, especially if I did OC them.

Just found the Supernova 850 B2 for $66. I can't find reviews for it, though?

SOLVED Seasonic X750 enough for CF 290s

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