Thanks for that, very interesting. I already have a Maximus V Extreme. I emailed asus and they told me I had to use slots 1 and 2b for crossfire or I would have problems. See below:-
"Native x8 x8 mode is enabled only when PCIE_X16/X8_1...
Just read the manual for the p8z77ws which states
In CrossFireXTM or SLITM mode, use the PCIe 3.0/2.0 x16_1 and PCIe 3.0/2.0 x16_2 slots for PCI Express x16 graphics cards to get better performance.
Basically they say to use the first...
Thanks for your advice, very useful. I've also found the maximus v formula which offers the same. I think it's the widest I'm going to get. Don't know why they build these cards if they don't support them fully.
Thanks for the reply, will that mobo give me any issues with placement ? Idid consider the Maximus V Extreme but I can't use the correct slots without jamming the cards together.