Overclock.net › Forums › Video Games › PC Gaming › Witcher 2 - No Tri-SLI Scaling or just poor SLI Scaling?
New Posts  All Forums:Forum Nav:

Witcher 2 - No Tri-SLI Scaling or just poor SLI Scaling?

post #1 of 29
Thread Starter 
UPDATE POST:


Maybe my OP isn't clear enough since I've figured out more of what's going on:

1. I'm running 1080p max settings with uber sampling and 3D.

2. I am getting 28-30 FPS using Tri-SLI.

3. I get these same frame rates using Dual-SLI.

4. All GPUs are pegged at 90%+.

Therefore, either something is wrong with the latest Battlefield 3 betas for Tri-SLI, the game doesn't take advantage of Tri-SLI, or Tri-SLI doesn't scale at 1080p regardless of how GPU intensive the game is.

And no, vRAM usage is surprisingly small in this game, so that is not the issue.

UPDATE: I just tried Shogun 2 and Just Cause 2 1080p max benches, and 3-way shows big improvements over 2-way SLI. And not even logical improvements - 100% scaling, which is higher than logical. Same exact thing with DA 2 - in the Kirkland square, 40 FPS vs. 70 FPS in 2-way vs. 3-way SLI.

Therefore, I conclude that drivers simply don't support 3-way SLI in this game.

------
ORIGINAL POST:

There seems to be either no scaling for 3-way SLI or subpar overall scaling with SLI.

I can't seem to set my 3-way SLI system to use just two GPUs from software, but if I go into single GPU mode, 1080p 3D Ultra with ubersampling but DOF and blur removed in the Dwarf town is 15 FPS. With three GPUs, it's 26 FPS. That's the kind of jump you should see from one card to two, not one card to three.

Can't test whether the scaling improves as the resolution goes to 1080p x 3 or do more analysis without physically pulling cards.

Unfortunate though. There is no substitute for ubersampling because nothing else gives you the anisotropic filtering plus parallax occlusion mapping.



[Rendering]
AllowAntialias=0
AllowBloom=0
AllowBlur=0
AllowCutsceneDOF=0
AllowDOF=0
AllowDecals=1.0
AllowMotionBlur=1
AllowRain=1
AllowSSAO=1
AllowScatterDOF=1
AllowShafts=1
AllowSharpen=1
AllowVignette=1
AtlasTextureDownscale=0
CharacterLodGameplayDownscale=0
DanglesLimiter=0
DetailTextureDownscale=0
FoliageDistanceScale=1.6
Fullscreen=1
MaxAtlasTextureSize=4096
MaxCubeShadowCount=4
MaxCubeShadowSize=2048
MaxSpotShadowCount=4
MaxSpotShadowSize=2048
MaxTextureSize=2048
MeshDistanceScale=2.2
ShadowQuality=3
ShadowedLights=3
TextureDownscale=0
TextureMemoryBudget=1000
TextureTimeBudget=10
UberSampling=2
VSync=0
Edited by matrices - 10/16/11 at 6:56pm
Big Bertha MKII
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 @ 4.0 P7 P55 WS 580 Tri-SLI + GT 240 8GB 
Hard DriveOptical DriveMonitorPower
90GB Vertex 2 SSD + 1TB F3 Asus BD-ROM 3 x Asus VG236 (120hz/3D) Antec HCP-1200 
Case
Corsair 700D + window 
  hide details  
Reply
Big Bertha MKII
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 @ 4.0 P7 P55 WS 580 Tri-SLI + GT 240 8GB 
Hard DriveOptical DriveMonitorPower
90GB Vertex 2 SSD + 1TB F3 Asus BD-ROM 3 x Asus VG236 (120hz/3D) Antec HCP-1200 
Case
Corsair 700D + window 
  hide details  
Reply
post #2 of 29
It seems to me like your CPU is a massive bottleneck for your overkill GPUs
Dark Wasp
(13 items)
 
Zebra II
(19 items)
 
Water Arc Mini
(16 items)
 
CPUMotherboardGraphicsRAM
i7 7700K Asus ROG Z270 Code 2x GTX 980 Ti SC Corsair Dominator 16GB DDR4 @3200 
Hard DriveHard DriveOSMonitor
Samsung 960 Evo M.2 Samsung 850 Pro 1 TB Windows 10 LG 34UM95 3440x1440 34" 
KeyboardPowerCaseMouse
WASD mechanical brown swithces Seasonic 850w Platinum Caselabs Merlin SM8 Black Razer Deathadder Chroma 
Audio
Audioengine A2 + D1 DAC 
CPUMotherboardGraphicsRAM
i7 3770k  Asus Maximus V Gene Asus GTX 670 DCII  Samsung 8GB @1866 
Hard DriveCoolingCoolingCooling
Samsung 830 Series 256GB SSD EK Supremacy Acetal nickel Dual 240 Black Ice GT Stealth EK GTX 670 DCII waterblock 
MonitorKeyboardPowerCase
Dell ultrasharp U2412m WASD mechanical keyboard Corsair AX750 Fractal Arc Mini 
MouseMouse PadAudioAudio
Steelseries Sensei Razer Megasoma Audioengine A2 Beyerdynamic Custom One Pro 
  hide details  
Reply
Dark Wasp
(13 items)
 
Zebra II
(19 items)
 
Water Arc Mini
(16 items)
 
CPUMotherboardGraphicsRAM
i7 7700K Asus ROG Z270 Code 2x GTX 980 Ti SC Corsair Dominator 16GB DDR4 @3200 
Hard DriveHard DriveOSMonitor
Samsung 960 Evo M.2 Samsung 850 Pro 1 TB Windows 10 LG 34UM95 3440x1440 34" 
KeyboardPowerCaseMouse
WASD mechanical brown swithces Seasonic 850w Platinum Caselabs Merlin SM8 Black Razer Deathadder Chroma 
Audio
Audioengine A2 + D1 DAC 
CPUMotherboardGraphicsRAM
i7 3770k  Asus Maximus V Gene Asus GTX 670 DCII  Samsung 8GB @1866 
Hard DriveCoolingCoolingCooling
Samsung 830 Series 256GB SSD EK Supremacy Acetal nickel Dual 240 Black Ice GT Stealth EK GTX 670 DCII waterblock 
MonitorKeyboardPowerCase
Dell ultrasharp U2412m WASD mechanical keyboard Corsair AX750 Fractal Arc Mini 
MouseMouse PadAudioAudio
Steelseries Sensei Razer Megasoma Audioengine A2 Beyerdynamic Custom One Pro 
  hide details  
Reply
post #3 of 29
Indeed, looks like a CPU bottleneck.

SLI is scaling perfectly for me on The Witcher 2, no issues at all.
    
CPUMotherboardGraphicsGraphics
Intel Core i7 7700k ASUS Maximus IX Formula EVGA GTX1080 Ti *soon* EVGA GTX1080 Ti *soon* 
RAMHard DriveHard DriveHard Drive
16GB Corsair Dominator Platinum 2666MHz CL16 Samsung 950 PRO M.2 512GB WD Red 4TB WD Green 1TB 
CoolingOSMonitorKeyboard
Corsair H110i GT Windows 10 PRO ASUS ROG Swift PG279Q Corsair K70 RGB MX Brown 
PowerCaseMouseMouse Pad
EVGA Supernova T2 850W Phanteks Enthoo Luxe Logitech G900 Chaos Spectrum Razer Destructor 2 
AudioAudioAudio
Beyerdynamic DT-770 PRO 80ohm JDS O2+ODAC Zalman MIC-M1 
  hide details  
Reply
    
CPUMotherboardGraphicsGraphics
Intel Core i7 7700k ASUS Maximus IX Formula EVGA GTX1080 Ti *soon* EVGA GTX1080 Ti *soon* 
RAMHard DriveHard DriveHard Drive
16GB Corsair Dominator Platinum 2666MHz CL16 Samsung 950 PRO M.2 512GB WD Red 4TB WD Green 1TB 
CoolingOSMonitorKeyboard
Corsair H110i GT Windows 10 PRO ASUS ROG Swift PG279Q Corsair K70 RGB MX Brown 
PowerCaseMouseMouse Pad
EVGA Supernova T2 850W Phanteks Enthoo Luxe Logitech G900 Chaos Spectrum Razer Destructor 2 
AudioAudioAudio
Beyerdynamic DT-770 PRO 80ohm JDS O2+ODAC Zalman MIC-M1 
  hide details  
Reply
post #4 of 29
The review below shows that GTX570 (representative enough for GTX580) scales very well from single to 2-way SLI for Witcher 2 at 1920x1200 and 2560x1600.
The review also confirms that Uber Sampling ''is a huge performance killer.''

Using those numbers and percentage increase as basis, if you get 15 fps at 1080p for a single GTX580, I expect 2-way SLI GTX580 will double the fps to almost to 30 fps. So, your getting 26 fps with 3-way is a little baffling. It could be CPU bottlenecking (more likely) or just bad scaling going from two to three cards (less likely).

But regardless, I suppose when the resolution jumps from 1080p to 3x1080p, this huge increase in resolution should relatively 'waterdown' the CPU's relevancy.

Reference link:
http://www.benchmarkextreme.com/Arti...Review/P4.html
Edited by windfire - 10/16/11 at 7:40am
post #5 of 29
Thread Starter 
To update everyone, I was able to run 2-way SLI to compare with 3-way, at 1080p anyway, and I can confirm that there is 0% scaling for 3-way SLI. The scaling of 2-way SLI is about 80% for me.

I don't think the CPU can be the bottleneck. That makes no sense because ubersampling is a GPU-intensive option, and because it is a super-sampling like option, which means that the actual rendering resolution is higher than 1080p but then downscaled to 1080p.

Nonetheless, I will run a Heaven benchmark using two and three GPUs at 1080p to see if there is just no scaling to be had with three 580s on an i5 GPU.

e: Heaven isn't cooperating and it fails to run fullscreen at 3-way SLI for some silly reason. At any rate, it brings up an interesting question about CPU bottlenecks with high-end GPUs. The assumption is that the bottleneck moves from CPU to GPU as you increase the resolution. But does this still apply when the graphics load is already very intense at a lower resolution? In other words, does the bottleneck shift because the resolution increases, or because the graphics card just happens to get stressed at the higher resolution? Because in this case the graphics card is stressed at the lower (1080p) resolution anyway, since it's also go ubersampling and 3D mode enabled.
Edited by matrices - 10/16/11 at 9:38am
Big Bertha MKII
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 @ 4.0 P7 P55 WS 580 Tri-SLI + GT 240 8GB 
Hard DriveOptical DriveMonitorPower
90GB Vertex 2 SSD + 1TB F3 Asus BD-ROM 3 x Asus VG236 (120hz/3D) Antec HCP-1200 
Case
Corsair 700D + window 
  hide details  
Reply
Big Bertha MKII
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 @ 4.0 P7 P55 WS 580 Tri-SLI + GT 240 8GB 
Hard DriveOptical DriveMonitorPower
90GB Vertex 2 SSD + 1TB F3 Asus BD-ROM 3 x Asus VG236 (120hz/3D) Antec HCP-1200 
Case
Corsair 700D + window 
  hide details  
Reply
post #6 of 29
Thread Starter 
For reference, see this fellow OCNer's post:

http://www.overclock.net/pc-games/10...fix-guide.html

Notice how he gets barely more than 2-way scaling on his 3-way setup at 1080p using similar settings to me.
Big Bertha MKII
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 @ 4.0 P7 P55 WS 580 Tri-SLI + GT 240 8GB 
Hard DriveOptical DriveMonitorPower
90GB Vertex 2 SSD + 1TB F3 Asus BD-ROM 3 x Asus VG236 (120hz/3D) Antec HCP-1200 
Case
Corsair 700D + window 
  hide details  
Reply
Big Bertha MKII
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 @ 4.0 P7 P55 WS 580 Tri-SLI + GT 240 8GB 
Hard DriveOptical DriveMonitorPower
90GB Vertex 2 SSD + 1TB F3 Asus BD-ROM 3 x Asus VG236 (120hz/3D) Antec HCP-1200 
Case
Corsair 700D + window 
  hide details  
Reply
post #7 of 29
Cpu bottleneck is constant in all resolutions.
Lets say cpu can deliver 100 fps in a game. Then thats the maximum the game will ran at any resolution or any graphic settings.
However,if gpu cant keep up with cpu and deliver 100 fps,then your fps will be lower.
Cpu bottleneck is always there,its just that its hidden in higer resolutions because card cant keep up and delivers less fps then cpu
Bottom line,either cpu or gpu always have to be a bottleneck otherwise you would be getting 999999999999 fps lol
Or to answer your question yes cpu can be a bottleneck no metter what graphic intensive settings you choose. If your gpu's have reech cpu fps limit,then cpu will bottleneck
Did you try disabling ubersampling option ? If there is no great fps boost,then its clear cpu is a bottleneck
Edited by digiadventures - 10/16/11 at 9:54am
Budget gaming pc
(13 items)
 
  
CPUMotherboardGraphicsRAM
intel i5 2400 msi h61m-p23 Gigabyte windforce geforce 660 gtx 8 gb ddr3 kingston 1333@7-7-7-21 
Hard DriveOSPowerCase
500 wd caviar blue win7 ultimate x64 seasonic sII bronze 520w cooler master 430 black 
  hide details  
Reply
Budget gaming pc
(13 items)
 
  
CPUMotherboardGraphicsRAM
intel i5 2400 msi h61m-p23 Gigabyte windforce geforce 660 gtx 8 gb ddr3 kingston 1333@7-7-7-21 
Hard DriveOSPowerCase
500 wd caviar blue win7 ultimate x64 seasonic sII bronze 520w cooler master 430 black 
  hide details  
Reply
post #8 of 29
I really doubt it is a CPU bottleneck. Quad core at 4ghz is not going to bottleneck.
Witcher 2 favors nvidia first of all, and is a terribly coded game which runs like crap
    
CPUMotherboardGraphicsRAM
Core i7 5930k MSI X99S SLI GTX 1080 32GB Crucial DDR4 
Hard DriveHard DriveCoolingCooling
(3x) Crucial 256GB (768gb RAID0) WD 3TB EK Supremacy EVO + D5 Vario GT-AP15 
CoolingMonitorMonitorKeyboard
2X HWLABS GTX360 (2x) 1440p QHD PLS MicroBoard 40" 4k MVA Corsair K70 RGB 
PowerCaseMouseAudio
Corsair RM1000 Custom Build Logitech G900 Yamaha RX-V465 + 5.1 Surround 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Core i7 5930k MSI X99S SLI GTX 1080 32GB Crucial DDR4 
Hard DriveHard DriveCoolingCooling
(3x) Crucial 256GB (768gb RAID0) WD 3TB EK Supremacy EVO + D5 Vario GT-AP15 
CoolingMonitorMonitorKeyboard
2X HWLABS GTX360 (2x) 1440p QHD PLS MicroBoard 40" 4k MVA Corsair K70 RGB 
PowerCaseMouseAudio
Corsair RM1000 Custom Build Logitech G900 Yamaha RX-V465 + 5.1 Surround 
  hide details  
Reply
post #9 of 29
Quote:
Originally Posted by iCrap View Post
I really doubt it is a CPU bottleneck. Quad core at 4ghz is not going to bottleneck.
Witcher 2 favors nvidia first of all, and is a terribly coded game which runs like crap
nope.jpg
    
CPUMotherboardGraphicsRAM
Core i7 4770k delid 4.3GHz Asus Z97M-Plus MSI GTX 770 2GB 1241/3815MHz 4x8GB Team DDR3-1600 
Hard DriveCoolingOSMonitor
Crucial MX100 512GB + 2x1.5TB WD Green (RAID 1) Arctic Freezer i11 (MX4) Windows 8.1 Pro + CentOS 6.5 VM Dell U2412M (1920x1200) 
KeyboardPowerCaseMouse
KUL ES-87 (Cherry MX Clear) Corsair CS550M Jonsbo U3BK (Rosewill Legacy U3-B) Logitech G400s 
Mouse PadAudio
XTRAC Carbonic Fiio Andes E07K + Audio Technica ATH-M50 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Core i7 4770k delid 4.3GHz Asus Z97M-Plus MSI GTX 770 2GB 1241/3815MHz 4x8GB Team DDR3-1600 
Hard DriveCoolingOSMonitor
Crucial MX100 512GB + 2x1.5TB WD Green (RAID 1) Arctic Freezer i11 (MX4) Windows 8.1 Pro + CentOS 6.5 VM Dell U2412M (1920x1200) 
KeyboardPowerCaseMouse
KUL ES-87 (Cherry MX Clear) Corsair CS550M Jonsbo U3BK (Rosewill Legacy U3-B) Logitech G400s 
Mouse PadAudio
XTRAC Carbonic Fiio Andes E07K + Audio Technica ATH-M50 
  hide details  
Reply
post #10 of 29
Quote:
Originally Posted by digiadventures View Post
Cpu bottleneck is constant in all resolutions.
Lets say cpu can deliver 100 fps in a game. Then thats the maximum the game will ran at any resolution or any graphic settings.
However,if gpu cant keep up with cpu and deliver 100 fps,then your fps will be lower.
Cpu bottleneck is always there,its just that its hidden in higer resolutions because card cant keep up and delivers less fps then cpu
Bottom line,either cpu or gpu always have to be a bottleneck otherwise you would be getting 999999999999 fps lol
Or to answer your question yes cpu can be a bottleneck no metter what graphic intensive settings you choose. If your gpu's have reech cpu fps limit,then cpu will bottleneck
Did you try disabling ubersampling option ? If there is no great fps boost,then its clear cpu is a bottleneck
This to an extent.
Kukumonster
(13 items)
 
A pleasant surprise :)
Cooler Master USP 100 Black Edition
Value redefined.
Amd Athlon II X3 435
CPUMotherboardGraphicsRAM
Core i5 2320 Intel DH67BL Sapphire R9 285 Corsair 8GB (4x2)  
Hard DriveHard DriveHard DriveCooling
Kingston HyperX Fury 240GB  WD Blue 1TB Seagate Barracuda 500GB Noctua NH-C14S 
CoolingOSMonitorPower
Noctua NF-A140*2 Windows 10 Pro (TP) LG 22" 1080p  Seasonic G-550 F3 550W 
Case
Cooler Master USP100 Black Edition 
  hide details  
Reply
Kukumonster
(13 items)
 
A pleasant surprise :)
Cooler Master USP 100 Black Edition
Value redefined.
Amd Athlon II X3 435
CPUMotherboardGraphicsRAM
Core i5 2320 Intel DH67BL Sapphire R9 285 Corsair 8GB (4x2)  
Hard DriveHard DriveHard DriveCooling
Kingston HyperX Fury 240GB  WD Blue 1TB Seagate Barracuda 500GB Noctua NH-C14S 
CoolingOSMonitorPower
Noctua NF-A140*2 Windows 10 Pro (TP) LG 22" 1080p  Seasonic G-550 F3 550W 
Case
Cooler Master USP100 Black Edition 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: PC Gaming
Overclock.net › Forums › Video Games › PC Gaming › Witcher 2 - No Tri-SLI Scaling or just poor SLI Scaling?