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r9 290 tri-x in crossfire with a 750w psu

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  • Power Supplies
  • Graphics Cards
  • r9 290 tri-x
  • Graphics
Last response: in Graphics & Displays
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May 11, 2014 2:41:32 AM

basicly the tittle says it all.
i have a 750W psu and i would like to know if i can run 2x the r9 290 Tri-X from sapphire without any problems.
i've done some research but couldnt find a straight awnser.

my rig:
750W Psu
samsung Evo 500GB ssd
seagate baracuda 3TB Hdd
WD green 1TB HDD
fx 8350 8 core cpu @ 4.62ghz
corsair h80i liquid cooler
ASUS M5A99FX PRO R2.0, socket AM3+ mainboard
aercool xpredator evil blue case

More about : 290 tri crossfire 750w psu

May 26, 2014 4:35:26 PM

Sorry but this is bullshit. Unless you have a no name brand bought on ebay, you don't need that much power for R9 290.
I have a fx 8320 at 4.5ghz and 2 R9 290 tri-x on ONLY a corsair TX750 and it's 3.5 years old. I have another system with the same Power supply but 2 3870x2. I doubt seriously that with only half the power connectors and a quarter of the gpus, a single R9 290 would consume as much as 2 3870x2. Also the power supply with 2 r9 290 tri-x doesn't get hot while playing crysis 2, doing 3dmark or heaven benchmark. But the one with 2 3870x2 gets really hot, close to a graphic card.
Stop listening to people who haven't tested the cards or made some elementary logic. I know the 3870x2 are old and people wouldn't have thought to them for a comparison, but take the GTX 780 Ti. It consumes more power than R9 290/x and has a power requirement of 600w (Nvidia website).
Make sure it is a quality power supply because I know mine can overload up to 900 watts for 20 minutes without any damage but I have already done session of gaming that lasted for hours both on the 2 R9 290 tri-x and the 2 3870x2 and both power supply survived.
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May 26, 2014 10:31:43 PM

So you'd say that i can use my 750 watt PSU?
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May 27, 2014 3:27:39 AM

Its bad idea to load a psu too highly . You may get away with it for a while but the psu will be running hot and probably noisy . And then there is the issue of psu quality . There is no standard way wattages are rated by different manufacturers . Is yours a quality psu?

http://www.guru3d.com/articles_pages/radeon_r9_290_cros...

Actual power draw of a similar system 493 watts . Roughly 40 amps from the 12 volt rail for the graphics cards alone .
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May 27, 2014 4:40:40 AM

Well if you have a high quality power supply that can handle a bit of overload because of the peak power consumption can go higher than 750w then you might be able to do it. I know my power supply can handle 900w for 20 minutes without damage but you can hear it (that's what the review said) but I never heard it even when I do furmark with 2x3870x2 (my 2nd system).
And I doubt my power supplies are badly overloaded because it's been 2 years since I put the 2x3870x2 in my 2nd computer with an overclocked cpu and I do long sessions of gaming (at most 3-4hours with only a 15 mins brake) regularly and it's still working and the power supply is 5 years old so it doesn't have its full power anymore. And in my main with the 2xR9 290 tri OC and an FX-8320 at 4.5ghz, the power supply is 3.5 years old but it wasn't used to his full power with only 2x6970 before but still, it's not nothing.

If you are serious about the 2 R9 290 tri-x and don't mind upgrading your power supply if you have to, I recommend you to buy the graphic cards and see for yourself if you really need to buy another power supply. Start by putting your cpu at his stock speed do some benchmark like heaven or 3dmark which are more realistic than furmark.
If your 750w power supply isn't enough, then you could go in powertune and reduce maximum consumption by 20% until your new power supply arrives so you can keep gaming until then.
I just don't want to you to buy another power supply if you don't have to and in the worst case, you will spend maybe a week (time for the new power supply to arrive) without having your 2 R9 290 tri-x at their maximum power but do you really need it now?
If you need a new power supply, check for the EVGA 1300w, in my country it's cheaper than most 1000w (215$ CAN shipping and taxes included), a single rail (perfect for theses cards), high effiency and a 10 year warranty. Check for reviews. I was thinking of buying it because I was just like you, I was sure my power supply couldn't handle it but I tested it for fun and it worked.

Anyway good luck with that and make sure you have a high quality power supply with a single rail if you are going to test it. To give you an idea, my two computers have a Corsair TX750.
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May 27, 2014 4:55:56 AM

I have to agree with dark... those figures are off and some by quite a bit. They're being quite conservative.
Not too sure about 750w, either. I know it will work with 850w, but I'm a bit skeptical about 750w but I agree with dark about testing : )
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May 27, 2014 6:26:44 AM

Outlander_04 said:
Its bad idea to load a psu too highly . You may get away with it for a while but the psu will be running hot and probably noisy . And then there is the issue of psu quality . There is no standard way wattages are rated by different manufacturers . Is yours a quality psu?

http://www.guru3d.com/articles_pages/radeon_r9_290_cros...

Actual power draw of a similar system 493 watts . Roughly 40 amps from the 12 volt rail for the graphics cards alone .



I have a 750 watt thermaltake
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May 27, 2014 2:45:11 PM

assassinC said:
Outlander_04 said:
Its bad idea to load a psu too highly . You may get away with it for a while but the psu will be running hot and probably noisy . And then there is the issue of psu quality . There is no standard way wattages are rated by different manufacturers . Is yours a quality psu?

http://www.guru3d.com/articles_pages/radeon_r9_290_cros...

Actual power draw of a similar system 493 watts . Roughly 40 amps from the 12 volt rail for the graphics cards alone .


Some thermaltake models are low quality , others are pretty decent . Do you know the model number?

I have a 750 watt thermaltake


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