R9 280x Toxic and Powercolor R9 270x Devil Edition Crossfire Setup

Daniel Felices · Sep 13, 2014

As the title says...
Can i crossfire this 2 graphics card in 650W PSU Click Here
My pc specs is
Motherboard: MSI Z87-G41 PC MATE
Processor: i7 4770 (Non-K) @Stock
Ram: Kingston 8GB
Video Card: Sapphire R9 280x Toxic

LukaBoki · Sep 13, 2014

You can't crossfire an R9 270X and an R9 280X I think.

Suztera · Sep 13, 2014

Yeah, you can't crossfire a R9 280X with a R9 270X, only R9 280X /HD 7970.
I would not crossfire with your PSU anyway.

LukaBoki · Sep 13, 2014

Spongebob agrees.

Daniel Felices · Sep 13, 2014

LukaBoki :

For real? I was thinking that I might be able to crossfire these cards since they are on the same family, but I still want to make sure that this cards will work fine in crossfire so that it won't cause any problems in the future.

Daniel Felices · Sep 13, 2014

Suztera :

I see. Then what is the recommended PSU for crossfire r9 280x toxic?

LukaBoki · Sep 13, 2014

850W should be enough for 2xR9 280X.
EVGA SuperNOVA G2 850W is the one I would recommend.
But you don't need Crossfire if you don't have two or more monitors.
I would wait for the launch of the GTX 900 series and grab one of those instead of havin 2xR9 280X.

Daniel Felices · Sep 13, 2014

LukaBoki :

I see. I currently have Sapphire R9 280x toxic can you recommend me the best psu for it for oc setup? Also what is the safest temperature on overclocking it?

LukaBoki · Sep 13, 2014

Daniel Felices :

The Cooler Master V650 is going to be enough,even if you overclock.
You would want to keep your GPU under 90C at full load,doesn't matter if you OC or not.

Daniel Felices · Sep 13, 2014

LukaBoki :

Daniel Felices :

The Cooler Master V650 is going to be enough,even if you overclock.
You would want to keep your GPU under 90C at full load,doesn't matter if you OC or not.

I see. By the way I've tried overclocking my r9 280x toxic on gpu clock 1210, memory clock 2000 and VDDC 862 before but it crashes, should I increase its VDDC?

Daniel Felices · Sep 13, 2014

LukaBoki :

Daniel Felices :

The Cooler Master V650 is going to be enough,even if you overclock.
You would want to keep your GPU under 90C at full load,doesn't matter if you OC or not.

I see. By the way I've tried overclocking my r9 280x toxic on gpu clock 1210, memory clock 2000 and VDDC 862 before but it crashes, should I increase its VDDC?

LukaBoki · Sep 13, 2014

I am not an expert in OCing and I know little about it.
Suztera might help.

Suztera · Sep 13, 2014

Daniel Felices :

Knock down your memory overclock to 1600Mhz. 2000Mhz might be a bit optimistic. I believe if you using Sapphire Trixx utility you have to type in Memory Frequency so put 6500Mhz in the memory clock.

Each card has its own threshold. You can increase your VDDC since 862 won't be enough if you going over 1210Mhz. You gonna have to experiment your VDDC to find which value is stable for the clock speed and memory speed set.
I'm sure you could directly put 1000 in the VDDC but go up in small increments just to be safe.
Run GPU stress test for every setting you tweak.
Always monitor your gpu temps.
Remember to increase your power board limit.

The highest VDDC i seen was 1299 VDDC for a R9 280X toxic but that is for a good binned R9 280X toxic. Your R9 280X toxic may vary.

azzazel_99 · Sep 13, 2014

Yep can only crossfire two of the same card. The 7970 is an exception because the 280x is just a overclocked 7970. Literally same card with a different name and higher clock speeds.

Daniel Felices · Sep 13, 2014

Suztera :

Daniel Felices :

Knock down your memory overclock to 1600Mhz. 2000Mhz might be a bit optimistic. I believe if you using Sapphire Trixx utility you have to type in Memory Frequency so put 6500Mhz in the memory clock.

Each card has its own threshold. You can increase your VDDC since 862 won't be enough if you going over 1210Mhz. You gonna have to experiment your VDDC to find which value is stable for the clock speed and memory speed set.
I'm sure you could directly put 1000 in the VDDC but go up in small increments just to be safe.
Run GPU stress test for every setting you tweak.
Always monitor your gpu temps.
Remember to increase your power board limit.

The highest VDDC i seen was 1299 VDDC for a R9 280X toxic but that is for a good binned R9 280X toxic. Your R9 280X toxic may vary.

6500Mhz memory clock? Then how many gpu clock and vddc should i put?

Suztera · Sep 13, 2014

Firstly reset everything back to defaults.
Bump up your clock speed until it is stable. Run gpu stress test.
Bump up the memory clock until it is stable. Run gpu stress test.
Don't touch the VDDC yet.
Post another thread since your question is answered here.
Write the highest clock and memory speed you get.

Daniel Felices · Sep 13, 2014

Suztera :

1210 GPU Clock
1800 Memory Clock
862 VDDC
All stable
I see. can you recommend me some gpu stress software?

Suztera · Sep 13, 2014

Furmark is an extreme gpu stress test.
Unigine valley/heaven is good for long stress test.
Run Furmark first and then Unigine valley/heaven.

Where are you getting your clock speed from? What program?

Daniel Felices · Sep 13, 2014

Suztera :

Sapphire Trixx

Suztera · Sep 13, 2014

I think its already a good overclock. Any reason why you want to continue.

Daniel Felices · Sep 13, 2014

Suztera :

Yes it is. I just want to learn more on overclocking.
I've tried overclocking it in 5 minutes and I got 85% C

Suztera · Sep 13, 2014

Daniel Felices :

If you getting 85C, i wouldn't go any further. Personally i like my gpu to stay under 80C.

Daniel Felices · Sep 13, 2014

Suztera :

Ok, here is the results
Furmark 5 minutes Burn in test 85C
Unigine 70-72C

Also I was wondering if I should change its thermal phaste?

Suztera · Sep 13, 2014

As i mentioned, your overclock is pretty good. I wouldn't go further due to temps.
If you card is still in warranty, don't open it up since you void the warranty. Unless you prepared to buy another r9 280x if it breaks.

Daniel Felices · Sep 13, 2014

I see. Thanks a lot!

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