New pilot Here - Bad performance problems.

[EtherealN]

This guy has a killer system tips like "turn off mirrors" and "set water to low" "because they are resource hogs" are just PLAIN STUPID!

 

Except that finding sudden boosts in performance when changing one variable is a very good way towards figuring out what is causing the loss in performance, since different settings rely on different components.

 

Don't be so quick to call people stupid. ;)

 

Now the multi-gpu wich should be a plus is most likely causing a big problem. How hard would it be for you to try and mount only 1 card? Just for testing?

 

He has already tested with one card only. Crossfire can be disabled in software.

[EtherealN]

Well I'm not that knowlageable but using the 3 cards actually brings your cards down to 8x right? Of course that bandwith migh still be enough to have 1 card deliver full power, but I'm just gessing I really don't know.

 

Being down to 8x is not a problem.

[Stu MSD]

Well I'm not that knowlageable but using the 3 cards actually brings your cards down to 8x right? Of course that bandwith migh still be enough to have 1 card deliver full power, but I'm just gessing I really don't know.

 

Indeed it does when you use all 3 which is why the scaling isnt linear, however, the Asus Maximus Extreme ROG board I use will scale 2 cards at PCIx16 IIRC which is why my Crossfire scaling is usually better than my trifire scaling but regardless, x 8 isnt much slower than x16 in reality, certainly not on a 7970... in fact, believe it or not, x4 isnt much worse either. We simply arent utilising x16 at all yet with the current GPU architecture and nothing can change the fact that the CPU itself only has 20 PCIE lanes.

 

As soon as the new architecture is out I will upgrade as I want QuadFire but I wont do it until the architecture is out and stable to support it as at the moment the limiting factor with Gen 3.0 is actually the CPU's as Intel simply dont support it. put simply, the more devices you have on the bus, the greater the capacitive load and the more chance of signaling issues.

 

The desktop Intel CPUs are known to have such problems with Gen 3 and, whilst some are better than others in Gen 3 mode, its still a lottery.

Theree are good boards out there that are Generation 3 compliant, but if you've got a CPU that struggles with its layout because the margin on the PCIe bus (CPU side) for signaling is small, there's nothing you can do but use Gen 2 mode at the moment.

 

Anyway... I digress. LOL

Edited January 24, 2013 by Stu @ MSD

[Evilducky]

Couple of things to quickly try. Take the game off of full screen and turn down the clutter/brush from 800 to about 200 or 300. You wont see that stuff in the air anyways. Now are you getting bad performance in the air or on the ground or both? I guess people are very different. I find 40FPS pretty awesome to play this with. But im playing on a single monitor and that's in the air. On the ground I get about 25fps =P

[Stu MSD]

Couple of things to quickly try. Take the game off of full screen and turn down the clutter/brush from 800 to about 200 or 300. You wont see that stuff in the air anyways. Now are you getting bad performance in the air or on the ground or both? I guess people are very different. I find 40FPS pretty awesome to play this with. But im playing on a single monitor and that's in the air. On the ground I get about 25fps =P

 

Thanks mate, will try it as soon as i get home. :D

[tintifaxl]

As far as I remember, there is a fps limiter in one of the lua files. Maybe this is set to 40?

[Stu MSD]

As far as I remember, there is a fps limiter in one of the lua files. Maybe this is set to 40?

 

Have checked the config files, seems to be set to 120.

[Rubberduck]

Have you tried it with just one display for comparison? And I would try disable the Aero as well.

 

With the spec below running 2 monitors( 1 as an output for the MFD's admittedely ) I am seeing around 30-40 on the ground with everything on, and depending on mission around 40-80 in the air, i don't suffer from stutters either like a lot of people with cluster munitions.

 

With that rig I would expect a lot more as well....

 

HTH

[slowhand]

As far as the FPS setting in the config .lua you should try a setting of about 60 max FPS due to the fact most monitors run at about 60hz. There are Great posts on this matter by Peter P that would be worth a read..Also you will need notepad ++ to edit any of those files..

Edited January 25, 2013 by slowhand

[blkspade]

The most immediate issue here is the negative crossfire scaling. I used to have 2 6970s, but had to disable crossfire because of the scaling. It may be an AMD issue, but IIRC Nvidia cards don't do much better in SLI with DCS either. That's a matter on no performance gain as opposed to neg scaling. Once you're left running a single card, I doubt the single 7970 can run DCS maxed out across 3 screens at that resolution. So next try it with eyefinity disabled, you may want to make the center screen your main monitor. 10 FPS is pretty bad, but best case is you'll still get mid 20's while on/close to the ground near airfields with most settings cranked up. Things typically get better with altitude with 40+ fps if you're an Air to Air guy like myself. I run a single monitor at 1920x1080 with high settings but water medium, no tree shadows (I don't spend much time in the dirt) 2xAA, mirrors on and no HDR. The HDR doesn't hurt performance as much as it makes the HUD unreadable when facing the sun.

 

Sadly the conventions you'll have to make are do to code optimizations yet to be done, if they are to be done.