Do you have 2 or more 7970's + Crossfire + Eyefinity? If so, i need your help... Please read on.

[Stu @ MSD]

Do you have 1 or more 7970's + Eyefinity? If so, i need your help... Please read on.

Hi guys,
Ok, This is the scenario... Please bear with me.

Since buying my 7970's I have been constantly testing and battling with OC settings, with my cards not liking to run over 1050 on the core regardless of voltage used. As soon as I try 1075 or above...BSOD 116.

Whilst i realise that on overclock is not guaranteed, I have discovered something interesting that proves in my case, its not just poor cards... read on.

I have 3x 7970's now, and recently tried swapping cards around to see if it made any difference and made an interesting discovery...

No matter which card I use, the one connected to the 3 monitors is then limited to the 1050 core.
This led me to trying different overclocks on each card so they are no longer tied together and, low and behold, the other 2 GPU's will run much higher core clocks!!

So, I made an assumption that since the card running the 3 monitors is also the one getting the hottest, i would await until I got my new loop installed and expected that the lower temps would solve the problem. Sadly, I was wrong.

My max temps on GPU and VRM's are now 40C and still the same core limit of 1050 applies to any card running the three monitors.

So, my question, you guys out there running in eyefinity with 3 monitors, what OC's are you achieving?

Thanks in advance for any info your can offer.

P.S: I realise that my next task is to disconnect 2 monitors and set the software up so its running just the one.

 

[eyetrip]

Do you have to connect all monitors to the same card?

Can you not do 1 monitor on each card? I am guessing no, but thought I would ask

Which drivers did you try?

PS - I don't run Eyefinity, and will only have my 7950's in crossfire tonight.

 

[Stu @ MSD]

Do you have to connect all monitors to the same card?

Yes mate sadly.

Which drivers did you try?

All of them, from 11.2 RC right through to the latest ones on the site now, which, incidentally, are the best for me. Also using the latest caps.

 

[wolvers]

Does your PSU have a single or multiple 12v rails? It could be that they're all running off of the one rail and it's at it's limit or summat. Just a thought really.

 

[FrankJH]

have you managed to get Eyefinity working without an overclock first?

Personally I would make sure everything is working first (I know eyefinity can be picky with cables and drivers etc), and then try overclocking

After reading initial post I wasnt sure if you had done this already (appologies if you have already)

 

[Stu @ MSD]

Does your PSU have a single or multiple 12v rails? It could be that they're all running off of the one rail and it's at it's limit or summat. Just a thought really.

Definately not power related, PSu is a single rail 1250w and this can happen when I am only drawing 500w.

have you managed to get Eyefinity working without an overclock first?

Yeah, eyefinity works really well mate, as long as the core is never taken past that 1050 limit.