Hello gryscl,

Thanks for prompt reply..  Yes I have one cpu now , but planing to add another one .

Then as total I can add 4 gpu is that right? 

My main concern is can i use AMD radeon w7100 8gb version * 2 

Like two cpu

Two nvidia  quadro k4000   ( 3gb each )

Two AMD radeon w7100 ( 8gb each )

My purpose of this config is purely GPU rendering ..

Don't know if it possible

Thanks

If your T7610 has one CPU it can use two GPU's. If it is a dual CPU model the two PCIe expansion slots are available allowing two additional GPU cards. The total PCIe wattage is 600w using all PCIe slots.  It is not SLI capable.

I am uncertain if adding your third GPU will increase the performance. 

Yes, it's possible to squeeze three or four graphics cards in the case but putting different manufacturers/models together sounds like trouble to me. The GPU drivers and heat dissipation could be a real issue.  These T7610's have a bad habit of not cooling the second CPU enough during intense use so adding all that hardware might be a bit much.  But I don't really know, hopefully someone else will chime in here. 

Selling your current GPU's and buying a modern top of the line single GPU is an alternative.

Hi grysql,

Yes I also think that putting nvidia and amd both might cause problem . In that case only two AMD or TWO nvidia is good .  Will see what can be done .  Thanks for your suggestion !

Will look forward to other peoples comments here.

Thanks