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Install GTX 980Ti alongside GTX 780?

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magellan

Member
Joined
Jul 20, 2002
I wanted to do some PhysX testing using my GTX 780 as the dedicated PhysX card. The 780 is already installed in the box. All I have to do to install the GTX 980Ti is plug it in and fire up the system right? Then power it down and switch the connection to my primary monitor to the 980Ti?
 

Janus67

Benching Team Leader
Joined
May 29, 2005
That's the gist of it, yes. But for the most part I wouldn't expect a ton of gains as the 980ti I imagine can handle the process just fine.

You also have to set the 780 as PhysX in the drivers.
 

ATMINSIDE

Sim Racing Aficionado Co-Owner
Joined
Jun 28, 2012
That's the gist of it, yes. But for the most part I wouldn't expect a ton of gains as the 980ti I imagine can handle the process just fine.

You also have to set the 780 as PhysX in the drivers.

This.
 

Tír na nÓg

Member
Joined
Sep 19, 2015
And the 780 ti being a hoooot card, you'll likely increase the temp in the case by several degrees.

Edit: Same go for the 780 :p
 
OP
M

magellan

Member
Joined
Jul 20, 2002
I just wanted to see what kind of diff running the GTX 780 as a dedicated physX card would make in the Metro:LL benchmark, if any.
I'd like to swap the positions of the GTX 780 and Creative Labs Audigy II and install the 980Ti all at once. Would it be feasible to just shut down the system, remove the power, re-arrange all the cards where I want them and then replace the power and power up the system? Or should I do just one card at a time?
 

EarthDog

Gulper Nozzle Co-Owner
Joined
Dec 15, 2008
Location
Buckeyes!
Not worth the time or the effort (for me) to do it, honestly. Considering there is testing on the web for this if you look... :)
 
OP
M

magellan

Member
Joined
Jul 20, 2002
I ended up trying this anyway, only because I bricked my 980Ti w/a bad BIOS flash.

I have four games that used physx (Fallout 4, COD:Ghosts, Metro: LL Redux and Unturned). I don't know what Unturned gets out of physx.

In my dedicated GPU benchmarking for Metro: LL Redux using the 780 alongside the 980Ti, the minimum frame rates actually went down and the maximums went up while the frame rate variation was clearly reduced over using the CPU for physx calcs.

I have read that some games disable advanced physx effects when there isn't a GPU dedicated to physx.

I wonder if fleX physics (which allow for much more complex particle/fluid based physics simulations) will make dedicated GPU's more worthwhile as PPU's?