PC1 Does pCARS run better with two GPUs or one GPU?

[Billy Pilgrim]

I'm about to buy all the parts for a new pc to play sims, and especially to play pCARS (and AC, rF2). I've already got three monitors for this too.

I'd really like to hear how pCARS performs with two GPUs.

I can't decide whether I should get one GTX 780ti or two GTX 780s.

What will give the best results with pCARS?

Your thoughts, experiences on this subject will be most welcome.

 

[rauf00]

Build: 732 x64
Setup: OC i7 + SLI 2way OC GTX780Ti
Driver: 337.88 beta
FPS: 73-109-97
min-max-aver

which is better than single card:
19,7% 47,3% 40,6%

 

[Billy Pilgrim]

Build: 732 x64
Setup: OC i7 + SLI 2way OC GTX780Ti
Driver: 337.88 beta
FPS: 73-109-97
min-max-aver

which is better than single card:
19,7% 47,3% 40,6%

What resolution / how many monitors? Are you running on high settings?

(You've got an extremely powerful rig. I do hope don't say you're on just one monitor)

 

[rauf00]

I'm checking fps efficiency since autumn 2013. All settings maxed, same track and conditions (single player, Spa with huge tribune and lot of trees).
FHD (1080p) on single monitor. The case is that pCARS is not yet optimize for SLI and 3xLCD. So custom profile is a need.

It will be much better as soon as SMS will add official support.

However i'm quite happy with performance of SLI with 3LCD, lowering AA from x16 to x4 and turning off blur let me play in fluently 80-100fps in most tracks with 20-30 AI's.
Look at gallery section, theres few vids with 3LCD and this setup.
http://www.racedepartment.com/forum/gallery/albums/project-cars.27/

Scaling ar 100% is for sure unrealistic, but typically in many games it works ar. 55-75%.

 

[Billy Pilgrim]

@rauf00 , your fps on 3 monitors is encouraging news.

 

[Terry Rock]

With the sheer amount of processing power available in today's cards, I'd go with a single card solution.
That said, PCARS doesn't struggle too much with any good card.
I ran it for some time on two 560Ti cards in SLI with everything maxed, great framerates and more importantly....no stutter.
Occasionally we run it on the shop's simulator with a GTX670 and still have mostly everything to max....same result.

 

[Billy Pilgrim]

With the sheer amount of processing power available in today's cards, I'd go with a single card solution.
That said, PCARS doesn't struggle too much with any good card.
I ran it for some time on two 560Ti cards in SLI with everything maxed, great framerates and more importantly....no stutter.
Occasionally we run it on the shop's simulator with a GTX670 and still have mostly everything to max....same result.

How many monitors?

 

[Terry Rock]

I see you'll be running three monitors.
That may dictate multi-GPU to get the frame buffers.
I only ran one 24" CRT at 2304 x 1440@85 Hz.
I got between 79-85 fps....also that was several builds earlier.

 

[Tony Gentile]

We are running triple 27"s with crossfire R290s smooth as
getting around 85-97fps no problems with every thing running..