NVIDIA 1080 & 980TI in same system

[HighTechJoe]

In my machine I currently have a 980TI and a 1080 Founders edition. In FAH, the 980TI is detected a GPU0 and the 1080 as GPU1.

Every time I check the estimated PPD in the app my 980TI shows a higher estimate.

Physically on my MBD, the 1080 is in the top slot (16 lane slot) and the 980TI is in the middle slot (8 lane slot). Obviously both are being lowered to 8 lanes.

I'm wondering if folding at home is optimizing for the 980TI since its first, and thus I'm not getting all the performance I should be out of the 1080. Is the estimated PPD relevant? Does the assigned GPU# in FAH impact settings and performance?

 

[TennesseeTony]

I find the client gets confused with mixed cards. Honestly, many times (especially after a restart) it seems my 980Ti is actually the 980, and the 980 is the Ti. Using the advance control (not web), I can select the 980 and it's estimated ppd in the right hand panel is higher than a 980 can possibly be, and the opposite for the 980Ti, lower than it should be.

For now I wouldn't worry about it, just see if you are getting at least 1,200,000 ppd here. If so I'd say you're ok. 1,400,000 ppd possible with 'good' tasks and some overclock.

Also I did some tests a few months back and 8x per slot is plenty of bandwidth. 1x destroyed pdd, and 4x hurt, maybe 15% less ppd. And that was on an older PCIe 2.0 board. So no worries there either, if in fact the board dropped to 8x on both.

 

[Markfw]

Actually I am surprised they are doing OK together. The drivers may have to optimize for one of the two. I have never tried that.