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Weird Problem: PSU & Xfire

post #1 of 6
Thread Starter 
I am trying to setup Crossfire on my current system. The way you do so is to install the card w/ crossfire connector and enable crossfire in the Catalyst control center. So I hook up the power connections & cross fire connector to my 2 6970s and power up the PC. I boot into windows and then into Catalyst. However, the option to enable crossfire isn't showing up in Catalyst at all.

I've uninstalled and reinstalled catalyst all to no avail. So my next thought is...it's the PSU or the PCIe slots. I boot each card individually in both PCIe slots on my mobo just fine. Even game with both cards in both slots (one at a time). So that rules out disfunctional PCIe slots.

Now I go on to test the PSU. The PSU is fully modular with 4 PCIe cables (2 6 pins and 2 8 pins). I boot each card individually, in each PCIe slot using the 6 & 8 pin PCIe cables I've been using for the past month when I only had one 6970. The second I go to boot with one 6970 using the 6 & 8 pin PCIe cables that I haven't used yet (while the remaining 6 & 8 pin PCIe cables are still plugged into the PSU) the system boots but wont post and no video is displayed on my monitor.

Thinking maybe it was the load I was putting on the PSU...I used a molex to PCIe 6 pin adapter. So now I try to boot with only 1 6970 hooked up to the PSU via 8 pin PCIe & molex to 6 pin PCIe adapter (still with the other 6 & 8 pin PCIe cable plugged in) the same thing happens...PC boots up but it doesn't post and there's no video. But, the PC will boot and post with one 6970 powered via the 6 & 8 pin PCIe cables I've been using for forever (even with the other 6 & 8 pin PCIe cables plugged into the PSU but not into a video card).

I'm receiving a more powerful PSU tomorrow. But do you guys agree with my assessment that my PSU can't handle the load or that the 2 modular PCIe cable connections that I only started using today maybe disfunctional?

Specs of my PSU:
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
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Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
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Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
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Creative Sound Blaster X7 
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CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
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post #2 of 6
Did you try putting your monitors on the other card? Sometimes the primary and secondary card gets switched.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by Riou View Post
Did you try putting your monitors on the other card? Sometimes the primary and secondary card gets switched.
No...but the thing is. GPU-Z isn't showing 2 6970s and neither is the device manager.
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
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Reply
post #4 of 6
Your PSU should handle 2 6970s just fine, has more than enough power, assuming that all cables are functional and whatnot. Are the fans spinning up and everything?
Bleeding Edge
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @ 5.0Ghz 24/7 ASUS P8P67PRO AMD 5870x2 8GB GSkill Ripjaw X 1600 @ CL8 
Hard DriveOSMonitorKeyboard
ADATA S599 64GB SSD + 2x 1TB Spinpoint (Raid 0) Windows 7 64Bit Dell 23" Razer Lycosa 
PowerCase
Seasonic X650 HAF X 
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Bleeding Edge
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @ 5.0Ghz 24/7 ASUS P8P67PRO AMD 5870x2 8GB GSkill Ripjaw X 1600 @ CL8 
Hard DriveOSMonitorKeyboard
ADATA S599 64GB SSD + 2x 1TB Spinpoint (Raid 0) Windows 7 64Bit Dell 23" Razer Lycosa 
PowerCase
Seasonic X650 HAF X 
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by ocpokey View Post
Your PSU should handle 2 6970s just fine, has more than enough power, assuming that all cables are functional and whatnot. Are the fans spinning up and everything?
Yeah, they are spinning up. Everything is powering up...fans, watercooling, etc. It just won't post and won't display video.
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
  hide details  
Reply
post #6 of 6
Thread Starter 
Update: Swapped out the Ultra PSU for a Corsair AX1200 and crossfire is working. After I removed the Ultra PSU I noticed that the modular hookups for the 6 & 8 pin PCIe cables were loose. They must have not been making a good enough connection to the PSU itself or something along those lines. Thanks for the help everyone!
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 6700k @4.7ghz (from silicon lottery) Asus Maximus VIII Impact MSI GTX1080 G.Skill Ripjaws V Series 32gb @3200mhz  
Hard DriveCoolingOSMonitor
Samsung 850 EVO Swiftech Apogee XL2 Windows 10 Home 64 Bit Acer Predator Z35 
KeyboardPowerCaseMouse
Filco Multicam TKL Silverstone SFX-L 700w Lian-li PC-Q37 Logitech G303 
Audio
Creative Sound Blaster X7 
  hide details  
Reply
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