Problem with RX 480 crossfire

[KarmaB]

Hello,
I have a Sapphire RX 480 8GB nitro+ OC that works just fine. I just bought a reference powercolor RX 480 8GB. The thing is both cards individually work fine, but when I try to use them both the computer goes insane, black screen etc. What is wrong? I would really appreciate any help.
Also, my pc specs:
CPU: AMD FX-9370
GPU: listed above
MOBO: ASROCK extreme6 990FX
OS: Windows 10 x64
PSU: 630W Thermaltake Berlin

 

[Durvelle27]

The PSU you have listed is nowhere near enough to power a power hungry 9370 and 2 RX 480s

 

[KarmaB]

I do have 2 cores disabled and downclocked to 3.8GHz and It draws around 300W with one gpu.

 

[vega22]

thermaltake psu with only 45 amps on the 12v?

are you able to borrow a stronger psu from a friend to test?

 

[KarmaB]

I could yes.

 

[vega22]

shit, do the 480s need pcie gen 3 for xfire?

only isn't 990 gen 2 only?

 

[Durvelle27]

Ok let's just dig into this

Even with 2 cores disabled and clocked at 3.8GHz

9370 will draw around 140-180W
Each RX 480 under load will draw 160-200W a piece

That totals around 580W give or take

Add in RAM, HDDs, and Fans

Than include that Thermaltake PSU is only 80+ Certified and at almost 100% of its capacity it won't be very efficient

shit, do the 480s need pcie gen 3 for xfire?

only isn't 990 gen 2 only?

Doesn't matter PCIe 3.0 is backwards compatibile

 

[INSTG8R]

Doesn't matter PCIe 3.0 is backwards compatibile

Yeah but for bridgeless Crossfire? Pretty sure it needs 3.0.

 

[Durvelle27]

Yeah but for bridgeless Crossfire? Pretty sure it needs 3.0.

It doesn't

It's be shown already to work just fine with PCIe 2.0

Our very own Wizzard even did a review on it. I've even ran RX 480s just fine with a dated X58 setup which is PCIe 2.0.

How can you guys not realize it's the PSU. 630W 80+ isn't enough to drive Multi RX 480s and a 9370

 

[INSTG8R]

It doesn't

It's be shown already to work just fine with PCIe 2.0

Our very own Wizzard even did a review on it. I've even ran RX 480s just fine with a dated X58 setup which is PCIe 2.0.

How can you guys not realize it's the PSU. 630W 80+ isn't enough to drive Multi RX 480s and a 9370

Fair enough. The PSU isn't up to snuff regardless.

 

[cdawall]

I had issues with my 750w platinum Seasonic and two rx480s under full load. Just fyi

 

[Filip Georgievski]

THAT CPU TDP!!
No, seriously, if it was an I5 i wouldnt worry too much since their TDP is 100W +/-5%.
But with that 9370 idk how long will the PSU last until it says IM OUTTA HERE.

 

[R00kie]

As long as you have that PSU in your PC, you're in for some fireworks.

 

[Liviu Cojocaru]

As long as you have that PSU in your PC, you're in for some fireworks.

)

on topic, that PSU is really not enough for everything that you have in your PC. try and get a more powerful one and see if it works

 

[Vya Domus]

Buy a better PSU , 800W and up for that system.

Unless you run that 9370 at like 4.8-5Ghz on all cores you are seriously holding back that crossfire setup.