5800 series crossfire questions

[thepwnorbpwnd]

I've always wondered, you know how the 5870 has 2 crossfire fingers and the 5850's and 5830's only have one? Would a person be able to put a 5850 as the top card, 5870 as the middle, and another 5850 on the bottom so you could chain all three?

As demontrated:

+ = one finger/connector
++ = two fingers/connectors
| = a link, or bridge


Done as:
+    5850
|
++  5870
  |
  +  5850

Instead of the regular:
++  5870
|
++  5870
  |
++  5870


If someone could test this and confirm if it works that'd be awesome. Anyway, off to the bar!

[thepwnorbpwnd]

Keeping in mind that the last connector is a long one so it could stretch over to the left hand side again.

[brucemangy]

the crossfire brdge has no interest in a mining point of view.

If you want to play games, putting a slower/less performing cards in the crossfire will decrease the perf.

[thepwnorbpwnd]

the crossfire brdge has no interest in a mining point of view.

If you want to play games, putting a slower/less performing cards in the crossfire will decrease the perf.

I'm not really talking in terms of mining, I'm talking about performance. And if you put 1+1 together you're not going to get 0.9, your going to get better performance. Just not as much as a person would get with 2 x 5870's.

[notaek]

In theory is should work.  Unfortunately I can't test it so I guess we just have to wait 

[ssateneth]

Crossfire is moot for mining. Period. OpenCL will continue to see each GPU as individual devices that you can mine on one at a time. Crossfire -only- has advantages for gaming. That's it.

[thepwnorbpwnd]

Crossfire is moot for mining. Period. OpenCL will continue to see each GPU as individual devices that you can mine on one at a time. Crossfire -only- has advantages for gaming. That's it.

Once again! Speaking in theory of gaming performance! Read the comments of the thread before posting!

[ssateneth]

I'm not really talking in terms of mining, I'm talking about performance.

Once again! Speaking in theory of gaming performance! Read the comments of the thread before posting!

What the fuck are you talking about then? Did you read the part where I said "Crossfire -only- has advantages for gaming."? Yes you can tri fire those cards in that configuration in that manner. Plug them in, and read gpu caps viewer, should say crossfire enabled 3 Gpus

[HellDiverUK]

Crossfire is moot for mining. Period. OpenCL will continue to see each GPU as individual devices that you can mine on one at a time. Crossfire -only- has advantages for gaming. That's it.

Once again! Speaking in theory of gaming performance! Read the comments of the thread before posting!

This is a mining forum.  There's millions of gaming forums.  If you ask these questions on a mining forum, what do you expect? 

Besides, Crossfire is broken on ATI cards - Google "micro stuttering".  Crossfire at the moment is a big waste of time and effort.

[thepwnorbpwnd]

Crossfire is moot for mining. Period. OpenCL will continue to see each GPU as individual devices that you can mine on one at a time. Crossfire -only- has advantages for gaming. That's it.

Once again! Speaking in theory of gaming performance! Read the comments of the thread before posting!

This is a mining forum.  There's millions of gaming forums.  If you ask these questions on a mining forum, what do you expect? 

Besides, Crossfire is broken on ATI cards - Google "micro stuttering".  Crossfire at the moment is a big waste of time and effort.

I have 2 7870's in my main rig and I've never been affected by micro-stuttering all the Nvidia fanboys yap about.