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would a 750watt psu be enough to run r9 290x + r9 270x

Tags:
  • HIS
  • Boost
  • Graphics
Last response: in Graphics & Displays
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January 15, 2014 6:41:58 AM

Hi,
I am currently with his r9 270x boost clock and planning to buy saphire r9 290x. Would a 750watt psu be enough for running both at a time(without crossfire) the purpose of using both is for mining.

Core i5 2500k
8gb kingsten ddr3 1333mhz
2 normal fans and 1 big fan running at the top
Asus p8hs67v
Currently having 500watt psu running r9 270x his on it.

I also wanted to ask if i can run 2 r9 290x on 750watt psu. Below is the model i have come up with

Corsair atx750

More about : 750watt psu run 290x 270x

January 15, 2014 6:45:25 AM

The R9 270X will not crossfire with your 290X. It will not boost the performance of the 290X. You are better off just selling the old 270X. The 750W will run that 290X without a problem.
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January 15, 2014 7:04:05 AM

Or just buy another 270x for much less $$.
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January 15, 2014 7:08:26 AM

Yes you can Crossfire with another 270X instead. The 750W will be able to run two of them. Just make sure your motherboard has two PCIE X16 slots and it supports Crossfire.

I'd rather you sell the 270X to make the 290X upgrade cheaper. That one card alone is a huge jump in performance. Crossfire right now is blehh.
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January 15, 2014 7:18:10 AM

Radeon R9-290X - require 33 Ampere and a 550W PSU minimum, so I would say 2 x 290x will require 800W PSU minimum.

And yes you can use both 270 and 290 cards in separate but not in Crossfire.

I cannot find your MB, so I am in doubt could you provide a link !
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January 15, 2014 7:30:33 AM

Hello guyz,

The first 3 replies mis understood me, i am i couldnt explain it properly. I did write (without crossfire) and also wrote for mining purpose. Each card on the board mines individually therefore i asked for running 290 and 270 at the same time without crossfire. The last reply from lonewolf7 has the answer but still i am a bit confused.

1)Radeon R9-290X - require 33 Ampere and a 550W PSU minimum, so I would say 2 x 290x will require 800W PSU minimum.
(i got one answer)

2)And yes you can use both 270 and 290 cards in separate but not in Crossfire
(Does this mean i can run both 290 and 270 on ATX 750 corsair? )

Here is the link to my motherboard

http://www.asus.com/Motherboards/P8H67V/

Sorry i am really new to this stuff. I see 2 pcie slots on my motherboard and i also see 2 mini slots (dark blue color) wanted to ask what are those for and can i use more than 2 cards on my motherboard?. I have heard of extender cables. Please explain , thankyou very much for all those who replied :)  i really appreciate your help.
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January 15, 2014 7:38:39 AM

My apologies for misreading your post. Your board supports up to four graphics card. Crossfire is not needed for mining. So yes it will accept both cards running separately. However I suggest at least an 800W PSU (800W or 67A from the 12V rails alone) because the 270X takes up to 180W at full load and the 290X is super power hungry close to 400W. And the rest of the system needs at least 200W to run safely.

Good luck and may the coins be with you.
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January 15, 2014 7:40:05 AM

You should be able to run both non-crossfire with that PSU.
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January 15, 2014 7:44:47 AM

Thankyou very much :)  for taking out your time to answer my queries. Can you please suggest me any good but not so expensive psu ? either coolermaster or corsair (1000watt).
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Best solution

January 15, 2014 9:04:22 AM

No you have not got any answer : 1. 290x requires 33 Ampere on +12V rail on a 550W PSU min on paper for the whole system to run, 300W on load will be needed for the GPU only to run on max load.

2. 270x requires 24 Ampere on +12V rail on a 500W PSU on paper for the entire system, but the GPU only requires 225W on max load.

3. So you will require minimum 57 Ampere on a 800W PSU to run the cards and the whole system.

4. Your MB has 2 x PCI-E slots, one runs x 16, another one runs on only x 4, so the performance will hinder for the card you install on x 4 slot, just keep it in mind.

5. At most you can use 2 x PCI-E GPU, rest of the slots are PCI version, and its hard to find PCI GPU nowadays.

6. You can go with this PSU :

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply ($149.99 @ Amazon)
Total: $149.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-15 12:04 EST-0500)
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January 16, 2014 5:31:59 AM

Finally i goit answer to my queries thanks a ton all of you specially lonewolf7.
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January 16, 2014 5:53:47 AM

You are most welcome.
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January 16, 2014 6:06:31 AM

I did a basic look for you. 750 w is fine. But it is the min psu that will run the cards you suggested.
What people often dont understand is that the amps is the product of the draw of voltage threw resistance. Even if your gpus ran at full load and needed a extra few amps your psu will deliver it. But the components will start to stress.

But even with basic research I do I bealive 750w will be fine.
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January 16, 2014 8:45:33 AM

I have raised my budget somehow and i will go for this psu which has been suggested above


Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply :) 
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