7950 Crossfire Enabled but not (if that makes sense)

Apprentrice5 said:

In CCC, and GPU-Z it is saying that crossfire is enabled, but in speccy it is saying it isn't.

I'd trust CCC/GPU-Z over speccy.


To verify, Open GPU-Z and select the second card from the dropdown menu.

Under sensors, look for GPU Load. In the dropdown menu select "Show Highest Reading"



Run the game and either quit or alt-Tab and see what the GPU Load is for the 2nd card. If crossfire is not enabled then there will little to no usage shown. If it is enabled then it will show load usage.

To compare, you can run two instances of GPU-Z - one for each card. If the Load is the same or close to for both cards, then it's definitely working.

Or you can also use Afterburner to monitor both cards simultaneously. Once out of the game you can compare the gpu load for each card. Again, if there is little to zero load on the 2nd card - it's not enabled. If it's the same as the primary - it's enabled.

and when I played Battlefield 3 for not even 5 minutes on ultra using Eyefinity it made my primary GPU to go up to 87 degrees C.

Simply adding the second card is enough to make the primary card run hotter as the bottom card disturbs the airflow.

Jumps of 10-20c is not uncommon for dual cards.


Unfortunately one downside to multi cards is the extra heat and noise. You can either manually crank your fans up in CCC or use Afterburner to create a custom fan profile to help keep temps down.

I'd wager it is enabled.

Apprentrice5 said:

Ok, ill try this when i get home this evening, how long would you say is a suitable time to play for to get a good reading?

CF will trigger as soon as the cards hit the full 3D clocks. (ie in game, not menu) Less than a minute will be enough to see if the 2nd card is active or not.

Hmmm well I have had some Crossfire issues where my cards have done the same but .....

When I am in Crossfire it Disables itself because card #2 can't keep up with card one

are these the same makes of cards running at the same speeds because in Tandem there not supposed to get that hot

I hate to say but above information is false the main GPU does most of the load but with Crossfire it's about 60% main GPU and 40 % the other GPU which top temps if any should be getting 70c to 80c max

that is normal especially in demanding games if you really want to see if crossfire is working correctly check the CCC if it is still enabled when it isn't or Disabled itself it will tell you straight up

My main GPU by itself under Heavy load reaches 72c max and I am running a single reference card right now and I assume yours has after market cooling so I would assume it is the game settings also it would help to keep V-sync on it helps the temps and stops your GPU's from going crazy because I bet that is what the issue is turn on V-sync

Check the speeds also if the main GPU is clocked higher it will take the speed of the lesser forcing it to downclock take that in mind too