Asrock Z87 OC Formula does not have a PLX 8747.
I'd say wait unless you can get a good deal on a Z170 used or Z270 board.
The following Z170 boards have a PLX Chip:
- Asus Z170 WS
- Gigabyte Z170 SOC Force
- Gigabyte Z170 Gaming G1 (only the gaming G1)
- EVGA Z170 Classified
I do not recommend the Z170 WS as it has not had BIOS updates and IIRC the EVGA Z170 had some BIOS issues. The Gigabyte Z170s had a few issues, but I think the BIOS has matured. Ask the Z170 SOC Force thread about this.
Amongst the Z270 boards:
- Asrock Z270 Supercarrier
- Gigabyte Z270 Gaming 9
They never made a Z270 Classified (probably due to lack of sales) and the Z270 WS does not have a PLX IIRC).
Another option for the cheapest:
- MSI Z97 Xpower has a PLX (Z87 Xpower does too, but be aware it is XL ATX)
- Gigabyte Z87 SOC Force
- Asus Z87 and Z97 WS both support IIRC, but I am not sure how good their BIOS updates are
- I think EVGA Z87 and Z97 Classified both do, but I have doubts about their BIOS quality
With Z87 Devil's Canyon you will need a BIOS flash though.
To be honest, I think that given the price of top end mainstream boards, you should:
- Consider buying a X299 + Skylake E solution
- Consider buying an AMD X399 + Ryzen E solution (it will be better in terms of multi-threaded and worse in single threaded, but likely a good value)
- If money is very tight, the release of these boards will lead to people selling their X99 + Haswell E systems ( many sold their X79 when X99 came out)
The advantage there is that you get more cores (5820k and its likely Skylake equal don't cost that much more than a 4790K and I bet the Skylake 6 core won't either. You could go with the Skylake equal of the 5930k as well for all 40 lanes. No idea what the AMD Ryzen E will look like but at least 32 PCIe lanes is expected.Edited by CrazyElf - 4/22/17 at 9:34pm