Is it possible to run 2 dedicated PhysX cards in SLI?

FCB 42

Commendable
Jun 4, 2016
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1,520
I am currently running 2 GTX 970s in SLI and plan to upgrade to a GTX 1080 as soon as they become available at prices closer to their MSRP. I will be reusing the 970s in future planned builds so I don't want to sell them, but won't be doing those builds for a few months so they'll be sitting around collecting dust unless I find something to do with them. I looked into the idea of using one of them as a dedicated PhysX card but one thing I was curious about but didn't see addressed anywhere (which I should maybe take as a sign): is it possible to run two cards in SLI as dedicated PhysX cards? Which is to say, can I have the 1080 in the x16 slot working as the dedicated graphics card and have the two 970s in the x8 and x4 slots connected with an SLI bridge doing dedicated PhysX? If anyone knows, I'd really love to hear.

Thanks in advance.

Rig:
i7-4790K (4.9 GHz @ 1.29 V)
Gigabyte GA-Z97X-Gaming 3
NZXT Kraken X61 (with 2x Noctua NF-A14 iPPC-3000)
32 GB Corsair Vengeance Pro DDR3-2133 CL11
2-Way SLI EVGA GTX 970 SC
EVGA 850 GQ PSU
240 GB Kingston HyperX Savage SSD
2 TB Toshiba DT01ACA200
5x semi-permanently installed 128 GB Patriot USB Drives
Corsair 760T Black Case
NZXT Hue+ LED System
 
Solution
I have no idea, but it should be a fun experiment. I wonder if you need to set it up as a single card with a SLI bridge, or if you can use the two cards separately. For sure, it won't be necessary, but interesting nonetheless.

FCB 42

Commendable
Jun 4, 2016
8
0
1,520
Yeah, I have no idea how the Nvidia control panel would deal with that setup, but I figured that if it can handle mixed-GPU SLI/PhysX with the SLI handling graphics maybe it could do the reverse and have the SLI handle the PhysX instead. I suppose I'll just have to play around with it once I get the 1080 and check back in to let you know how it goes (unless anyone comes along in the meantime with a good reason that it would be a bad idea).