Overclock.net › Forums › Graphics Cards › AMD/ATI › Tri/Quad crossfire 6900 users
New Posts  All Forums:Forum Nav:

Tri/Quad crossfire 6900 users - Page 2

post #11 of 23
I think what he's looking for are users of Tri and Quad fire, not random troubleshooting based on hardware specs. And I think he's established that the issue is clearly Eyefinity, since it works fine on a single monitor.
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 #12 of 23
Thread Starter 
Quote:
Originally Posted by tsm106 View Post
I get crashes in Hot Pursuit inside of 5 minutes. It's F!@#$% annoying. My 6 yr old loves that game and his daddy's big awesome PC can't play it, lol. I have to disable trifire so he can play it.

Each card passes OCCT all day long in single mode and dual mode. I'm going to setup my eyefinity this weekend, so I'll let ya know if I get more crashes in trifire + eyefinity Vega.
Ya I'd like to see if you can get tri-fire to work in Eyefinity.
Zybane
(20 items)
 
  
CPUMotherboardGraphicsRAM
i7 6950X - 4.5 GHz Edition 10 Rampage V Extreme Titan Xp  G.Skill 32GB 3200 MHz CL14 
Hard DriveOSMonitorKeyboard
1TB - Samsung SM961 Windows 10 Pro OLED 4K 55" LG C7P Razer BlackWidow TE Stealth Chroma 
PowerMouseAudioAudio
Corsair AX1500i 1500W Titanium Razer Mamba TE Denon AVR-X7200WA Elac BS 312 
AudioAudioAudioOther
Sennheiser HD-700 Headphones Velodyne MiniVee Subwoofer Buttkicker LFE Razer Orbweaver Stealth Chroma 
  hide details  
Reply
Zybane
(20 items)
 
  
CPUMotherboardGraphicsRAM
i7 6950X - 4.5 GHz Edition 10 Rampage V Extreme Titan Xp  G.Skill 32GB 3200 MHz CL14 
Hard DriveOSMonitorKeyboard
1TB - Samsung SM961 Windows 10 Pro OLED 4K 55" LG C7P Razer BlackWidow TE Stealth Chroma 
PowerMouseAudioAudio
Corsair AX1500i 1500W Titanium Razer Mamba TE Denon AVR-X7200WA Elac BS 312 
AudioAudioAudioOther
Sennheiser HD-700 Headphones Velodyne MiniVee Subwoofer Buttkicker LFE Razer Orbweaver Stealth Chroma 
  hide details  
Reply
post #13 of 23
All these games run with my eyefinity setup.


Edited by zpaf - 1/29/11 at 7:55am
Has
(10 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770K Asus Maximus VI Impact Sapphire 290X Tri-X OC 8GB G.Skill DDR3 2800MHz PC3-22400 TridentX 
Hard DriveCoolingOSMonitor
Samsung 830 256GB Corsair H100 Windows 8.1 x64 Dell 3xU2311H 
PowerCase
SilverStone 750W SilverStone TJ07 
  hide details  
Reply
Has
(10 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770K Asus Maximus VI Impact Sapphire 290X Tri-X OC 8GB G.Skill DDR3 2800MHz PC3-22400 TridentX 
Hard DriveCoolingOSMonitor
Samsung 830 256GB Corsair H100 Windows 8.1 x64 Dell 3xU2311H 
PowerCase
SilverStone 750W SilverStone TJ07 
  hide details  
Reply
post #14 of 23
Eyefinity has many problems with any Crossfire setup unfortunately. It is simpily a driver issue.

One thing you can try is downloading the latest CAP's. Download 11.1a again, and then download CAP 10.12 CAP2 and see if it helps.
    
CPUMotherboardGraphicsRAM
AMD R7 1700 @3.9GHz MSI X370 Titanium Asus GTX 1080ti Strix OC Corsair Dominator Platinum 16GB @2667MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 950 Pro M.2 Samsung 840 Sata Some other standard hard drives Corsair H110i GT 
OSMonitorKeyboardPower
Windows 10 Asus PG279Q 165Hz IPS GSync Corsair K70 Lux Quickfire FSP Hydro G 850w 
CaseMouseMouse Pad
Phanteks Enthoo Pro Razer Deatfhadder Elite Corsair Gaming somethingorother 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD R7 1700 @3.9GHz MSI X370 Titanium Asus GTX 1080ti Strix OC Corsair Dominator Platinum 16GB @2667MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 950 Pro M.2 Samsung 840 Sata Some other standard hard drives Corsair H110i GT 
OSMonitorKeyboardPower
Windows 10 Asus PG279Q 165Hz IPS GSync Corsair K70 Lux Quickfire FSP Hydro G 850w 
CaseMouseMouse Pad
Phanteks Enthoo Pro Razer Deatfhadder Elite Corsair Gaming somethingorother 
  hide details  
Reply
post #15 of 23
Why the hell don't they just include the CAPs with the drivers? I forgot to install those for a couple weeks.
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 #16 of 23
Thread Starter 
I forced scissor and tile rendering in RadeonPro but that did nothing to help. I think this problem is at a greater depth than just the screen rendering mode. Single/Dual 6970's only been working Eyefinity, triple/quad 6970's crash the game and give me errors like this:





Some interesting scaling numbers for single 2560x1600 display Heaven 2.1:

1x = 35 FPS
2x = 67 FPS
3x = 102 FPS
4x - 120 FPS
Zybane
(20 items)
 
  
CPUMotherboardGraphicsRAM
i7 6950X - 4.5 GHz Edition 10 Rampage V Extreme Titan Xp  G.Skill 32GB 3200 MHz CL14 
Hard DriveOSMonitorKeyboard
1TB - Samsung SM961 Windows 10 Pro OLED 4K 55" LG C7P Razer BlackWidow TE Stealth Chroma 
PowerMouseAudioAudio
Corsair AX1500i 1500W Titanium Razer Mamba TE Denon AVR-X7200WA Elac BS 312 
AudioAudioAudioOther
Sennheiser HD-700 Headphones Velodyne MiniVee Subwoofer Buttkicker LFE Razer Orbweaver Stealth Chroma 
  hide details  
Reply
Zybane
(20 items)
 
  
CPUMotherboardGraphicsRAM
i7 6950X - 4.5 GHz Edition 10 Rampage V Extreme Titan Xp  G.Skill 32GB 3200 MHz CL14 
Hard DriveOSMonitorKeyboard
1TB - Samsung SM961 Windows 10 Pro OLED 4K 55" LG C7P Razer BlackWidow TE Stealth Chroma 
PowerMouseAudioAudio
Corsair AX1500i 1500W Titanium Razer Mamba TE Denon AVR-X7200WA Elac BS 312 
AudioAudioAudioOther
Sennheiser HD-700 Headphones Velodyne MiniVee Subwoofer Buttkicker LFE Razer Orbweaver Stealth Chroma 
  hide details  
Reply
post #17 of 23
Thread Starter 
Well I believe I have found what the problem is with tri/quad crossfire Eyefinity using 6970's on 3x 30" displays. It's a bandwidth limitation on the crossfire bridges.

If I drop the resolution down from 4800x2560 to 3150x1680, quad-fire Eyefinity magically works again. Using Heaven 2.1 which allows custom resolutions, up till about 4000x2000 quad-Eyefinity works. Above that bandwidth, it crashes.

So AMD decided to make their bridges run serial. So this means cards #4,#3,#2 data all has to pass to card #1 over a single bridge which it obviously can't handle at these high resolutions.

From TechReport: "One of those improvements is the ability to combine CrossFire multi-GPU setups with multi-monitor Eyefinity display surfaces. The appeal here is obvious, since pushing 24 megapixels with a single 5870 GPU is possible and sometimes quite workable, but not for every game. Generating that many pixels at the right quality levels would tax any single graphics chip. Making CrossFire work on this scale presents some challenges, however, as AMD readily admits. The core issue is the fact that the dedicated CrossFire interconnect used for passing completed frames between cards has "only" enough bandwidth to sustain a 2560x1600 display resolution. Even three 1080p displays will exceed its capacity."

Another huge design flaw just like the mixed Displayport/DVI-D Eyefinity screen tear design flaw. AMD has some very poor design decisions which will keep me away from them until they get their act together.

nVidia has the right way to design multi-GPU communications, parallel so that all cards can talk directly with each other:




Good thing I have 3GB GTX 580's on order so I can get rid of these 6970's!
Edited by CallsignVega - 1/30/11 at 3:54pm
Zybane
(20 items)
 
  
CPUMotherboardGraphicsRAM
i7 6950X - 4.5 GHz Edition 10 Rampage V Extreme Titan Xp  G.Skill 32GB 3200 MHz CL14 
Hard DriveOSMonitorKeyboard
1TB - Samsung SM961 Windows 10 Pro OLED 4K 55" LG C7P Razer BlackWidow TE Stealth Chroma 
PowerMouseAudioAudio
Corsair AX1500i 1500W Titanium Razer Mamba TE Denon AVR-X7200WA Elac BS 312 
AudioAudioAudioOther
Sennheiser HD-700 Headphones Velodyne MiniVee Subwoofer Buttkicker LFE Razer Orbweaver Stealth Chroma 
  hide details  
Reply
Zybane
(20 items)
 
  
CPUMotherboardGraphicsRAM
i7 6950X - 4.5 GHz Edition 10 Rampage V Extreme Titan Xp  G.Skill 32GB 3200 MHz CL14 
Hard DriveOSMonitorKeyboard
1TB - Samsung SM961 Windows 10 Pro OLED 4K 55" LG C7P Razer BlackWidow TE Stealth Chroma 
PowerMouseAudioAudio
Corsair AX1500i 1500W Titanium Razer Mamba TE Denon AVR-X7200WA Elac BS 312 
AudioAudioAudioOther
Sennheiser HD-700 Headphones Velodyne MiniVee Subwoofer Buttkicker LFE Razer Orbweaver Stealth Chroma 
  hide details  
Reply
post #18 of 23
Quote:
Originally Posted by CallsignVega View Post
Well I believe I have found what the problem is with tri/quad crossfire Eyefinity using 6970's on 3x 30" displays. It's a bandwidth limitation on the crossfire bridges.

*snip*
Damn... that's a huge oversight by AMD... I'm wondering how ANY Eyefinity setup can work then, if even 3x1080p screens are past the bandwidth limit.
post #19 of 23
Quote:
Originally Posted by CallsignVega View Post
Well I believe I have found what the problem is with tri/quad crossfire Eyefinity using 6970's on 3x 30" displays. It's a bandwidth limitation on the crossfire bridges.

If I drop the resolution down from 4800x2560 to 3150x1680, quad-fire Eyefinity magically works again. Using Heaven 2.1 which allows custom resolutions, up till about 4000x2000 quad-Eyefinity works. Above that bandwidth, it crashes.

So AMD decided to make their bridges run serial. So this means cards #4,#3,#2 data all has to pass to card #1 over a single bridge which it obviously can't handle at these high resolutions.

From TechReport: "One of those improvements is the ability to combine CrossFire multi-GPU setups with multi-monitor Eyefinity display surfaces. The appeal here is obvious, since pushing 24 megapixels with a single 5870 GPU is possible and sometimes quite workable, but not for every game. Generating that many pixels at the right quality levels would tax any single graphics chip. Making CrossFire work on this scale presents some challenges, however, as AMD readily admits. The core issue is the fact that the dedicated CrossFire interconnect used for passing completed frames between cards has "only" enough bandwidth to sustain a 2560x1600 display resolution. Even three 1080p displays will exceed its capacity."

Another huge design flaw just like the mixed Displayport/DVI-D Eyefinity screen tear design flaw. AMD has some very poor design decisions which will keep me away from them until they get their act together.

nVidia has the right way to design multi-GPU communications, parallel so that all cards can talk directly with each other:




Good thing I have 3GB GTX 580's on order so I can get rid of these 6970's!
Did you find any other evidence of this?


I got my setup up and running. Haven't dialed up up yet, but here's some pics.

Just did a quick color matching before running a bench. Haven't done bezel compensation yet.

No crash here at 5040x1050 resolution on F1 2010 under TRIFIRE.




The 3930
(26 items)
 
Junior's 3930
(22 items)
 
DATA/HTPC
(20 items)
 
  hide details  
Reply
The 3930
(26 items)
 
Junior's 3930
(22 items)
 
DATA/HTPC
(20 items)
 
  hide details  
Reply
post #20 of 23
No crash on Metro@5040x1050. I can try running in portrait too.

Damn this game is taxing! AB graphs show all 3 gpus taxed at 99%.

Ok, setup F1 2010 in portrait no crash either.

Edited by tsm106 - 1/31/11 at 1:16pm
The 3930
(26 items)
 
Junior's 3930
(22 items)
 
DATA/HTPC
(20 items)
 
  hide details  
Reply
The 3930
(26 items)
 
Junior's 3930
(22 items)
 
DATA/HTPC
(20 items)
 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD/ATI
Overclock.net › Forums › Graphics Cards › AMD/ATI › Tri/Quad crossfire 6900 users