09-30-2014, 10:47 AM
the short beeps are likely related to 32-bit PCIe addressing. see if your bios has an option called "Above 4G Decoding" and if so, enable it. if it doesn't, then your board is not capable of 64-bit PCIe addressing.
once you get past that though, 6x 7990 will still not work as the driver only supports a maximum of 8 GPUs. most you can do on one board is 4x 7990.
once you get past that though, 6x 7990 will still not work as the driver only supports a maximum of 8 GPUs. most you can do on one board is 4x 7990.