Start digging the problem:
- I suppose you updated the BIOS to the latest
- tune CPU and BIOS in safe mode, no overclocking, low RAM settings
- turn off every BIOS Optimization tool
- reduce your configuration to a known working status
- make sure all four graphic cards are fine; throw out all but one graphic card, test it, change to the next one
- same with RAM
- same with PSU
- increase number of graphic cards
From what i can see here you might have a power problem. By adding two more cards on the PCIE bus, 120 additional Watts have to be provided. Since each Mainboards mixes this power in its own way from +3.3V/+5V/+12V you might kick over the limit on one of these lines, esp. with overclocked CPU and RAM.
Good luck!
- I suppose you updated the BIOS to the latest
- tune CPU and BIOS in safe mode, no overclocking, low RAM settings
- turn off every BIOS Optimization tool
- reduce your configuration to a known working status
- make sure all four graphic cards are fine; throw out all but one graphic card, test it, change to the next one
- same with RAM
- same with PSU
- increase number of graphic cards
From what i can see here you might have a power problem. By adding two more cards on the PCIE bus, 120 additional Watts have to be provided. Since each Mainboards mixes this power in its own way from +3.3V/+5V/+12V you might kick over the limit on one of these lines, esp. with overclocked CPU and RAM.
Good luck!