The low end Asrock boards are not well built, with thin PCBs and sometimes hidden components.
The high end Asrock boards are built as well as everyone else's flagships. Supercarrier as a flagship board would belong in the same category as their flagship Extreme11 series of HEDT boards.
I usually find Asrock is really good with their support of M.2 SSDs (Supercarrier can support 3), perhaps the best of the main motherboard makers, although MSI has gotten better as of late on Intel. The triple M.2 is cool, but you'll hit the DMI 3.0 limits quickly with 2 good M.2 SSDs on read, although 3 will be needed to max it out on Write. The M.2 SSDs in RAID 0 don't improve Random performance however.
Asrock Z270 Supercarrier does have a PLX chip allowing for x16/x16 with 2 GPUs, but it's not a huge advantage. Keep in mind the CPU still has just 16 lanes, plus DMI 3.0 so PCIe to CPU communications will be limited. The problem is that we don't know what it is like with the latest BIOS. In terms of raw build quality though, you can't go wrong. BIOS has been pretty good on Asrock - the UI is quite usable. I personally love the Asrock OC Formula series, but unfortunately, there is no Z270 OC Formula. Nick Shih from Asrock did confirm with us that there will be an Asrock X299 OC Formula though.
MSI's Z270 XPower seems to be pretty solid (so far it has been a good overclocker), and the Gigabyte Z270 Gaming 9 is not far behind, if not a peer (it also has a PLX chip, and is probably the most feature loaded Z270 board out there). I don't have as much experience with Gigabyte's BIOS on Z270, but they had a big redesign around the time they introduced the Z170 Designaire. They have a perhaps the best X370 BIOS on AMD, along with the Asrock X370 boards. None of the X370 BIOSes right now are mature though.
Sin0822 just published a review:http://www.tweaktown.com/reviews/8128/asrock-z270-supercarrier-motherboard-review/index.html
Take a good look at the BIOS screenshots. If you do buy the board, I"d recommend upgrading the Wireless card if you use it to an Intel 8265 Wireless or the newer Intel 9000 series.
VRM is ok, although not exceptional for this price. Texas Instruments CSD87350Q5D NexFET (8 + 4 + 1 + 1 configuration).
If you aren't overclocking, it's not a big flaw though.
The MSI Z270 XPower is about $50 cheaper and has better VRMs than the Z270 Supercarrier, although it doesn't have a PLX.
I think though that one thing to consider if you can wait is to wait until this summer or fall. Intel is reportedly pushing X299 to June. The advantage is that you would have 40 (or more) "True" PCIe 3.0 lanes rather than having to rely on the PLX PEX 8747. If you need it right away, X99 might be worth a look at for similar reasons.
Originally Posted by boed
Thanks - I need the slots for the big honkin cooled 1080 ti. One slot for a quad port 10gb/s nic, one for an LSI 16 drive controller. with a cooling fan for the RAID etc I really need an extended ATX. I had the BT fail on my current z170 gigabyte card which has good creative sound but I'm just so tired of the gigabyte quality issues (this is far from the first or the last gb motherboard I'm dealing with. I have to assist a friend with his gb motherboard that lately can't get halfway through the bios post.
I don't OC my motherboards so that isn't a big concern for me. 1240 vs 1230 on a benchmark doesn't interest me as much as reliability and decent audio.
That would be the Wireless card that failed, which is a reason why I advise updating the Wireless on Asrock.
Surprisingly for a high end board, Asrock's Z270 Supercarrier only has a Intel Dual Band Wireless-AC 3160.
Intel 8265 is their current top tier. Intel: 9260 and 9560 are coming soon.Edited by CrazyElf - 4/10/17 at 12:01pm