ASROCK says: 2 x PCI Express 3.0 x16 slots (PCIE2/PCIE3: single at x16 (PCIE2) / x8 (PCIE3) or dual at x8/x8 mode)
ASUS says: 2 x PCIe 3.0/2.0 x16 (x16 or dual x8)
If I read this right, both offer 2 PCI 3.0 that can run in 8x dual (if SLI or crossfire, which I may not need anyway).
Also ASROCK has Digi-power (8 + 4 Power Phase Design) whereas ASUS is Industry leading 4 + 1 + 1 Phase Power Design. What's the difference.
Also, what practical benefit do I get with the ASROCK over the ASUS?
IThe Z77 Extreme4 is a decent budget board imho i personally wouldn't buy it.But seems good from the reviews and members here on TH seem to fancy it.I have done a few builds for friends with it the only negative I have for this motherboard is that it slips outside of typical ATX specifications. It’s 3cm thinner than a standard ATX motherboard and as a result may lack secure mounting on the far side since this isn’t a common size, which also means you should be very careful when plugging in the 24-pin ATX motherboard power – as the motherboard may flex.I prefer quality assurance i do not feel i get that with Asrock so i go with Asus because i find it totally unacceptable that they try to cut corners in making the motherboard i would rather pay the extra for a motherboard made correctly others don't mind and prefer the cheaper route and don't feel it's any less quality to each his/her own i always say