www.si-community.com

At 3:50 minutes you'll see some gpu tests.
http://www.youtube.com/watch?feature=player_embedded&v=IO0XpxzeVgA

http://mango.blender.org/


If you skipped the video, here the render time for the BMW benchmark file:

1 Tesla: 1 min 4 secs
2 Tesla: 34 secs
Although this result is not really comparable to the one obtainable with a GTX 580 (23 secs), there is a main difference: Tesla cards have 6GB of memory, each. This means that in the dual configuration we could render a test scene (the bridge scene) with several GB worth of textures and data (otherwise impossible on a GTX).
The time for rendering such scene was:

Dual Tesla config: 5 mins
Dual Xeon rendernode: 15 mins
We are going to get Brecht over here very soon to see if he can improve the performances of Cycles on this cards. Will we eventually be able to replace the whole renderfarm with a GPU-based solution? We don’t know yet!

Currently we’ve put the cards next to more humble GTX 260′s in two workstations, this will help designing a lot. Special thanks to Nvidia for giving us these cards to test!

The memory between the two cards cannot be used like a single entity (ergo, you don't have 12 gb of vram if using two card with 6 gb each), or no?

In any case, this test is really interesting. CPU rendering will die soon? For sure not in this generation of VGA, I think next generation, when memory on board can be 12 gb or more.

Also, blender cycles result seem really good.