Good and cheap mainboard with 1150 socket for 6 GPUs

[AnorakSupra]

Got 12 DVI->VGA Adapters.
Then I found out that my GPUs do not have analogue ports.

I tested the other board, and that one seems to work. BUT!
Read here:

Problems booting ASRock H81 Pro BTC. No POST, 9 out of 10 starts

Okay, now I tested the other board I have. It is a ASRock Z77 Extreme4 with 2 PCIE x16 slots, and 2 PCIE x1 slots. Now here is what I found! Latest BETA drivers install without problems. 1 GPU with raiser in the first PCIE x16, 1 GPU with raiser in a x1 slot: The miner crashes the driver. 1 GPU with raiser in the first PCIE x16, 1 GPU with raiser in the second PCIE x16 slot: The miner works!!! What the actual F* ? Why won’t the RX470 work in a small PCIE x1 slot??