What happens if I crossfire a 7850 with 7870.

[goombaxiv]

What happens if I crossfire a 7850 with 7870. Will the 7870 throthle back to the 7850 performance or they will both run at their maximum?

 

[mrwil]

you can always oc the 7850 to the 7870 performance.

 

[goombaxiv]

What happens if both are OC

 

[ilysaml]

The faster card will downclock itself to cope up with the slower card, you need to have the same Memory Clock & GPU Clock running for the best performance.

And it's highly recommended to CF identical cards.

 

[goombaxiv]

I do understand that the speed as to be the same but the 7850 has 1024 SP and the 7870 has 1280 SP.

Is the CF combo going to behave has 2 X 1024 SP or 1024 + 1280 SP?

It make sense that the clock has to be the same but cutting the number of cores doesnt seem right?

 

[ilysaml]

It doesn't go like this...when you CF...nothing is doubled...both the HD 7850 and HD 7870 have the same "GPU" so they share the work load between each other.

You'll end up having 2 x HD 7850s...because the HD 7850 has the lower SP,.....etc.

 

[goombaxiv]

Ok thanks for the reply. I wonder why they allowed to CF higher cards when the best one will be downclocked.

 

[ilysaml]

Ok thanks for the reply. I wonder why they allowed to CF higher cards when the best one will be downclocked.

Well you can always get the same card and free yourself of such hassle

 

[goombaxiv]

Best answer selected by goombaxiv.

 

[Mousemonkey]

This topic has been closed by Mousemonkey