post #1 of 1
Thread Starter 
Hi folks,

Just bought a Z77 Extreme4-M and i7 2600k.

i7 2600K @stock
Z77 Extreme4-M
Sapphire 7870XT Crossfire
8gb ddr3 ram (kingston + g skill sticks)
240GB OCZ Vertex 3 MAX IOPS SSD
Corsair TX850M PSU

I made the necessary changes to windows once I set up the board. I reinstalled the AMD CCC drivers, Installed the appropriate Intel Chipset Drivers, LAN, and Audio drivers. Everything was working extremely well. I was playing BF3/BF4 with Crossfire on.

I was initially using the top two PCIE3 (x8/x8) slots but my top GPU temp reached 95 celcius so I decided to use the top PCIE3 and bottom PCIE2 x4 slots together. Again, everything was great- temps dropped to 75 celcius under FurMark.

After restarting my computer, the monitor would no longer show any image from the GPU plugged into the top PCIE3 slot. I tried every possible combination of crossfire and single cards (used both 7870 XT cards in addition to a spare 560TI) and all cards work in the 2nd and 3rd slot but none work in the 1st slot.

Even when the 1st slot is occupied, it is recognized as empty in BIOS.

Updated BIOS to 1.8-latest version. This didn't help. Made PCIE the main video source under north bridge settings- didn't help. Switched to PCIE GEN1 rather than Auto- didn't help.

Would appreciate any advice aimed at solving this issue. If not, will have to return the board.

Thanks folks!
    
CPUMotherboardGraphicsRAM
Intel Core i7-7700 Z170 GeForce GTX 1070 @stock 16GB DDR4 Memory -2400 MHz 
Hard DriveOSMonitorMonitor
Mushkin Reactor 1TB 7mm Windows 10 Samsung UN43KU7000 43" 4K HDR TV 15.6" 4K Samsung PLS G-Sync Monitor 
KeyboardMouseMouse PadAudio
Tesoro Excalibur Spectrum SE Logitech G403 Prodigy Wireless Gaming Mouse Corsair MM600 Adam Audio ARTist 5 
AudioAudioAudioOther
Bang & Olufsen Beoplay h7 headphones Sony h.ear on MDR-100AAP headphones Sound Blaster E5 DAC/Amp Linksys EA8500 AC2600 MU-MIMO router 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel Core i7-7700 Z170 GeForce GTX 1070 @stock 16GB DDR4 Memory -2400 MHz 
Hard DriveOSMonitorMonitor
Mushkin Reactor 1TB 7mm Windows 10 Samsung UN43KU7000 43" 4K HDR TV 15.6" 4K Samsung PLS G-Sync Monitor 
KeyboardMouseMouse PadAudio
Tesoro Excalibur Spectrum SE Logitech G403 Prodigy Wireless Gaming Mouse Corsair MM600 Adam Audio ARTist 5 
AudioAudioAudioOther
Bang & Olufsen Beoplay h7 headphones Sony h.ear on MDR-100AAP headphones Sound Blaster E5 DAC/Amp Linksys EA8500 AC2600 MU-MIMO router 
  hide details  
Reply