SLI / CrossFire FAQs

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Xeja1

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Aug 1, 2014
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I have 3way Crossfire (R9 290s) in my set-up, and i have a question.

When i go into the Control Panel to turn on Crossfire, it gives me 3 options, 3 GPU (some numbers), 2 GPU (some numbers), and then 2 GPU again (with some more numbers).

Whats the difference between these options?
 

Xeja1

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Aug 1, 2014
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Underneath the 2 buttons for enabling and disabling Crossfire, their is a drop down box that has the 3 options i mentioned before.

3 GPUs (0 6 12)
2 GPUs (0 12)
2 GPUs (0 6)

Perhaps it has to do with how the frames are rendered? The thing is, i cant find any official documentation on this anywhere. Seems weird.

Yes, my system is just fine :) Plus it has 7680x1440p to push, so its not lazing around either lol

I pair the GPUs with a 4930K and 1866 Memory on the ASUS Rampage IV X79 board. I bought the cards almost on day 1 of their release, so theyre all custom cooled with the arctic coolers that were very popular for a bit.
 

nukemaster

Titan
Moderator
I do not see any official documentation and see users just wondering about it as well.

I may be worth shooting an email off to AMD about this one.

With 3 GPU's you should have best performance. and with that resolution to push, it is good to have all that power.
 

Sammy_84

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Aug 4, 2014
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Hi there,

I would like to crossfire 2 x R9 280X's - The mb I would like to use is Maximus VII Hero. The AGP ports run @ 8x in duel mode. Will this be sufficient to take advantage of the cards or am I better off trying to find a board that will run 2 x 16x AGP ports? This limits my options a bit as you pay a fair bit more and I like the Hero.. is it necessary? Many Thanks!
 

nukemaster

Titan
Moderator

Please check to ensure you have the latest bios for the board. Sometimes you may need the secure boot option off for some cards as well.

It is best to create your own thread for this type of issue.


I am not 100% sure you can crossfire those cards. They seem to have different cores.

Radeon R7 260X = Bonaire with 128-bit memory controller.
Radeon R7 265 = Pitcairn with a 256-bit memory controller.

Even if it worked, it would be like crossfiring a 5770 with a 5870. You may get it to work, but may perform worse than a single card.

I would Contact AMD to be 100% sure those cards can work together in crossfire.
 

Sn1992

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Jul 13, 2013
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I crossfired my r9 280x vapor x with my new xfx black r9 280x but i dont get any fps gains more than 10 more than single card in battlefield 4
Tried dissabling ulps
I dont know how to resolve this issue



Complete specs


Processor - INTEL i7 4790k devils canyon(haswell refresh) @ 4.6ghz on 1.26v
Motherboard- ASUS REPUBLIC OF GAMERS MAXIMUS VII HERO
RAM- G.SKILL RIPJAWSX 2x4GB 2133mhz
Cooler- corsair h80i liquid cooler with noctua nt-h1
Graphic card- SAPPHIRE R9 280x VAPOX 3gb xfired with r9 280x black edition
PSU- COOLER MASTER silent pro M 850w
CABINET- corsair air 540 HIGH AIRFLOW (with 3x CM jetflows and 2x CORSAIR AF140)
Lighting- NZXT HUE RGB Controller
Fan controller- NZXT GRID fan controller
Harddisk- WD caviar green 500Gb
Ssd- 120gb 840 evo
 

nukemaster

Titan
Moderator
What is the actual frame rate. if you went from 50 to 60 that would sound like Vsync.

Your system specs look more than enough for anything.

Please ensure that the latest drivers are in use and even try the beta ones since they tend to get crossfire profile optimizations first.

I would fine it extremely unlikely that you have a system bottleneck with the cpu or gpus.
 

Sn1992

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Jul 13, 2013
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It would be strange if anything bottlenecks as these are high end gpus and one of the best cpu
My frame rate was 55 avg and now its 70 avg
 

nukemaster

Titan
Moderator
For the sake of completeness can you please try some other games or benchmarks.

You may get more help making a thread about his actual problem because I am not sure how many users are active in this thread.
 

chris25

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Aug 23, 2013
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How does this happen that this was posted in 2007 but this guy foreseen r9 series and tita!! How??isn't it creepy!?!?!!
 

chris25

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Aug 23, 2013
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The original post was in 2007 when he posted the r9 series and all that..how does it made possible? Creepy!!freaking post!! 2007 anf he was able to enumerate all 2013-14cards!!
 

Scott Leess

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Jan 30, 2014
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hers a question for you
im getting my second gpu to run crossfire
my main gou asuys r7 260x is over clocked ( OC edition)
my 2nd gpu is not over clocked
would that make a diffrance?
 

8350rocks

Distinguished


No, you should be just fine. I would recommend trying to keep the manufacturers and clockspeeds close, but it is not necessary for crossfire to do so as long as the cards use the same GPUs.
 

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