SLI working

[335th_GRAthos]

Who said there is a GTX570 with 3Gb VRAM, there is not.

The only card with 3Gb VRAM to my knowledge is the GTX580 version.

This is definitively the card to have for the time being!
(because as I mentioned in previous posts, I believe we have to wait for two generations of GPUs to come in order to see real performance with this game).

You can see the performance of this card thanks to Tuckie's great work (download the high quality video but be careful, the 1080 quality is 340Mb )
FPS test video on switching from GTX275 to GTX580

http://www.youtube.com/watch?v=Fgqr41HA8YA

~S~

[ingsoc84]

Do we know if that is a 3gig 580 or 1.5? Thanks for the comparison..seeing that my current set up knocks every game I have out of the field..even those with direct 11, the logical and best choice I now think absolutely is to wait for the next or second gen card..as you mentioned..no need spending a lot now JUST to get smooth fps on this one game...when given time..a newer generation card will handle CoD well..AND new games as well...buying the 580 would be just throwing money away at the moment..to play one game..and would be obsolete two years down the road for the newer offerings which I believe will take more and more advantage of direct x 11. 20-30 fps with this 580 does not seem to be worth it...IF he is playing with 1.5 ram..but..either way..thing to do is wait..which is hard for me and most gamers.
Thanks again

reading th posted commetns on that vid..its the 1.5 card.

[335th_GRAthos]

Just tested RickRuski's recommended setups and installed the new NV drivers.
The SLI setup is much smoother now!

RickRuski
--------------------------------------------------------------------------------

Although I have only recently gone Sli I feel that I have found some things that help to get it running reasonably well.

(1) make SURE that all settings are the same in all adjustments (control panel, Invidia Inspector, etc) sometimes I have found that they aren't.

(2) Try and get all cards balanced so that voltages, frequencies, etc are the same. ( I use EVGA precision Tool for this purpose available at EVGA , my two cards are from different stables and therefore not the same clocks etc.)

(3) Overclocking sometimes has a negative effect (although my cards are factory O/C I have turned them down to stock settings and find them more stable)

Hope these few things that I have found during testing help others who might be struggling.

Here are my new "Profile" settings applied after 285.27 beta driver.

Sli compatibility bits (DX10) 0x00000011
Sli compatibility bits 0x00000011
AA-mode override any application setting
AA-setting 2x (2x Multisampling)
AA-Transparency Multisampling Enabled
AA-Transparency Supersampling Off/ Multisampling
Text filtering-Anisotropic sample opt. OFF
Text filtering-Negative LOD Bias Clamp
Text filtering-Quality Quality
Text filtering-Trilinear opt. OFF
Max pre-rendered frames 3
Multi-display/mixed-GPUacceleration Single display performance mode
Power management mode Adaptive
Treaded optimization Auto
Triple buffering OFF
Vertical Sync Force on

Sli : -

AA-SliAA AA MODE SELECTOR SLIAA ENABLED
Number of GPU's to use Sli SLI_GPU_COUNT_TWO
NVIDIA predefined No.GPU's SLI_PREDEFINED_GPU_COUNT_DX10_TWO
NVIDIA predefined No. GPU's SLI_PREDEFINED_GPU_COUNT_TWO
NVIDIApredefined SLI mode DX10 SLI_PREDEFINED_MODE_DX10_FORCE_AFR
NVIDIA predefined Sli mode SLI_PREDEFINED_MOED_FORCE_AFR
SLI rendering mode SLI_RENDERING_MODE_FORCE_AFR

Other : -

Do not display this profile in the C/P CPL_HIDDEN_PROFILE_DISABLED
Enable application for Optimus 0x00000011 (Il-2 Sturmovik: Cliffs of Dover)

Now have smooth play after cards reach operating temps.
Get EVGA "Precision" tool to show fps and card temps, also to balance frequencies and voltages. These will display on screen instead of using "Fraps".


RickRuski

~S~

[335th_GRAthos]

Hmmm....it is very strange.

I had two days of great SLI playing on the REPKA Server #3 with 70-100 fps and no stutters.

The third day (today) I had a different experience:
Flying towards the enemy (blue) base island, towards a dogfight with many planes, my fps dropped to 6-14fps !!!!!

This time there were some planes more in the server but I still can not explain the difference.

So I am sad to say that the problems remain to be solved.
I can not however explain the first two good days of flaing though.

~S~

[335th_GRAthos]

It is nice to see that some "inexpensive" NV cards appear in the market with >2Gb VRAM.

GTX570 2.5Gb VRAM

GTX560ti 2Gb VRAM

GTX550ti 3Gb VRAM

GTS450 3Gb VRAM

GT430 2Gb VRAM

Has anybody tried them with CoD?
I have my eyes set on these GTX570 2.5Gb but I wonder how much improvement I will get for 600EUR (I need two) just for increasing VRAM from 1,3Gb to 2,Gb ...

~S~

[335th_GRAthos]

Update 28 October 2011

I stopped using SLI and fly only on a single GTX570 1,3Gb card after I realised that in sli mode I was getting less smooth game albeit I had almost double fps!

Thanks to the ATAG server (because it provided us with a very high end platform in terms of CPU (6xXeon), RAM (48Gb) and Bandwidth (10Mbps)- a great thanks to the members of ATAG!!!) I had the opportunity to test excessively my rig online at different settings.

Flying the English channel map with dozens of enemy planes and bombers, I have nice 50fps on a single GPU (and 90fps on sli but the game is not smooth enough fr my taste) at resolution 3024x1024.

I will post some pictures and my settings soon...

I still have problems, notably the current patch has a dreaded "memory leak" so watch your av ailable RAM indicator while flying, is it over 94% used, you are bound to exerience a CTD very soon. The only solution is to stop COD and restart the game. But it is less tragic that it sounds if you know and control the situation.


As a sum up, I will have to revise the title of my post, "sli is not really working" or to be more objective, the latest official patch (Oct. 2011) made the game easily playable with med range 1,3Gb VRAM graphics card (as long as a 570GTX is considered med-range).


This is a big improvement and congratulations to 1C! (of course, there is we expect).


~S~