6870 crossfire crashing.

[Skurge]

System specs are as follows,

Phenom2 1090T
Gigabyte 6870 1GB crossfire
4GB DDR3 memory
Gigabyte 890FXA-UD5
Coolermaster GX 750W

Both cards work individualy, but in crossfire they crash within minutes of running furmark or most games, I tried different drivers, bridges, put the cards into different PCI-E slots. swaped the motherboard and the memory. I'm still getting crashes.

 

[john3850]

Looking at your pc specs it looks like you got a lot heat if your oc.
It could be a voltage or temp problem in relation to your ps.

The Bad:about Coolermaster GX 750W from jonnyGURU website.
cannot handle heat at 750 watts
ripple issues on the 3.3V rail
questionable capacitor quality

 

[Arg Clin]

I agree voltage or temp problem.

I'm guessing voltage unless you have really bad airflow. I've been able to run Furmark fine on my 6870CF even with the case intake fans broken down. Even with only reasonable airflow the 6870 fans does a good job at keeping the heat out. (while sounding like an airplane) Did you put temp monitor on cpu and gpu's while running furmark?

I'd suggest try hooking up a good solid PSU for testing. (like a Seasonic X750 or better)

 

[Skurge]

It wasn't heat. Both cards are the 3 fan windforce cards in a thermaltake element S case. They didn't go higher than 69c, the CPU was stock clocked with a CNPS9900 cooler.

I didn't try a different PSU. The client got impatient so we gave him a 580, Now I'm getting one of the 6870s for my own system. I have a OCZ 500W PSU. I assume I would be safe with that card and that PSU, but I would like to make sure before I try the card.

 

[john3850]

The heat and load from the system may be causing PS problems is what I meant.
Try to run the cpu and cards with no oc to reduce the watt load on the ps.
A few times my cf clocks were running at different speeds which also caused crashing and lock ups.
With the msi oc utility you can choose which card is the master or the first card.
Believe you can set the msi oc utility to log for more info.
I ran many different sli or cf over years 78,79,88,4890,5870 the reason I stopped I always blew one of the cards even with good cooling.
Till this day I believe cf or sli shortens the card life I also barly used the cards that blew.

 

[Arg Clin]

69C is nothing on the 6870. Mine goes up to 96C in Furmark and stays there without any hiccups. Rear exhaust feels like it's about to set fire to something, but the cards do fine.

So no - definately not a heat issue in the cards.

At 69C I don't think that much heat would migrate to the PSU either if any - unless you have extremely poor airflow or set the PSU to suck up heat from the system.

 

[Skurge]

69C is nothing on the 6870. Mine goes up to 96C in Furmark and stays there without any hiccups. Rear exhaust feels like it's about to set fire to something, but the cards do fine.

So no - definately not a heat issue in the cards.

At 69C I don't think that much heat would migrate to the PSU either if any - unless you have extremely poor airflow or set the PSU to suck up heat from the system.

Nope PSU is monuted at the bottom so, it sucks air from outside.

In any case, I got one of the 6870 and isntalled it in my system. I tried out 2 games and I'm horrible CPU limited in both f1 2011 and Dirt 3.