Yanyu Gongkong drastically redesigned the K17 v1.0 into v1.2 which is now almost identical to the K37 except:

• K17 v1.2 has two mechanical USB ports carrying a PCIe signal and two 2×5-pin header carrying a PCIe signal.
• K37 has four mechanical USB ports carrying a PCIe signal and one 2×5-pin header carrying a PCIe signal.

I am waiting for confirmation from the vendor whether these PCIe signals are fully usable. This would technically make the K17 v1.2 a "12-slot" and K37 a "13-slot" motherboard.

The lack of comments started to make me think few were interested 

There might be a 12 slot PCIe motherboard, but I can't find who manufactures it. This is seems to be a Shenzhen Zrt Co design. I contacted them to confirm... Only one random Alibaba seller has pictures of it: https://fashionplaza.en.alibaba.com/product/60680844122-805574575/Fast_shipping_p106_12pcs_gpu_ZEC_Zcash_ETH_miner_ethereum_mining_machine.html

However I have a sneaking suspicion of this being a scam, a picture photoshopped from ZRTD-101. Slots 4 5 6 (from the right) seem digitally inserted. It's a wide area with no screw holes for support (flimsy), and the PCB/component layout is too repetitive. And the entire rest of the PCB layout (even the faintly visible traces) are strictly identical to the ZRTD-101... Plus powering 12 cards with the 12 power outputs on the PCB, fed by only 7 power inputs is not a great idea, unless your cards are low power, but then it would limit the utility of the mobo...

I confirmed the manufacturer of K17/K37 is Yanyu Gongkong.

I added the Yanyu Gongkong K35, very similar to the K37, but with a Celeron and passive heatsink preinstalled.

I added the OEM B250 12P where all 12 PCIe links are in the form of mechanical USB ports, in order to connect your riser cables directly to the motherboard.

I added the Letine M08.

Let me know if I miss any other motherboard.

I added Shenzhen Zrt's ZRTK-21612 which, incidentally, is the company who designed the PandaMiner motherboards (such as model ZRTK-21611). 21612 is clearly inspired from 21611, the main difference being that they replaced the MXM slots with PCIe slots.

ZRTK-21612:


ZRTK-21611:

I added the K17, a model that preceded the K37. I actually can't find who manufactures them, so I'm marking them "OEM". K17 seems to have slightly less clearance between the PCIe slots than the K37. But the biggest differences are around power:

• K17 has six 6-pin power inputs (by the CPU area), and one output per slot.
• K37 has eight 6-pin power inputs (by the CPU area), and two outputs per slot except the 2 slots nearest the CPU which only have one nearby power output (so cards plugged in these 2 slots, assuming they all require 2 power connectors, must be powered straight from the PSU.)

Edit: actually K17 rev 1.0 has the power configuration I describe, but K17 rev 1.2 has as many power inputs/outputs as K37: https://sc02.alicdn.com/kf/HTB1gOeLojnD8KJjSspbq6zbEXXaL/231649078/HTB1gOeLojnD8KJjSspbq6zbEXXaL.jpg

K17:


K37:


It's really convenient to power cards straight from the board, cable management is a lot easier:



I hope they do have really thick PCB traces able to carry all these amps...

I added 3 Supermicro boards. They are typically not very popular due to high cost per PCIe slot, however the dual-socket makes them attractive for concurrent GPU+CPU mining (eg. CPU mining Monero + GPU mining Ethereum.)

I found out this Inno3D motherboard is a actually an OEM/ODM product, seemingly manufactured by Sunfa. Model number 6299-FA355: https://www.alibaba.com/product-detail/9gups-9-pci-e-16X-slot_60728424903.html

(1) Bitmain has already done similar things in the past. They released the S7 in Oct 2015, and barely 8 months later (Jun 2016) they released the S9 with next-gen chips & better efficiency.

(2) Bitmain's GPU rigs, even if obsoleted by an Ethereum ASIC, will still be viable for any of the numerous other GPU mineable coins.

I added the INNO3D motherboard with 9 slots. It's a motherboard+backplane configuration very similar to the ZRT except the motherboard is in the center, which makes more sense from a PCIe latency viewpoint. Cooling a chassis built around this backplane is also more even and a bit easier thanks to the mobo in the central position.

Ok, thanks for the clarification!

I like the Octominer B8PLUS, I added it to my reference list of motherboards with 8+ PCIe slots:

http://bitcoin.zorinaq.com/many_pcie/

The B8PLUS has the slots spaced by 45mm (as I read on the website), and I wish it was 50mm like the ZRTK-21613 & ZRTD-101. But I guess you can really do that only if the designers had saved space by mounting the CPU/RAM/SSD on a vertical card like ZRT did....

Octominer, how long have you guys been in business? I mean the "SHENZHEN IH SUCCESS LTD" entity? Did you guys form the company recently just to target the mining market?

Ok I added the Onda D1800. I think mobos like this definitely deserve a spot on my list.

I also added my personal favorite: the ZRTK-21613 & ZRTD-101, which is a backplane with 9+1 slots and the actual motherboard is just another card that plugs into the "+1" slot. So when the motherboard fails, it's easy to replace, and the backplane has a negligible failure rate. No risers. Slots are spaced 50mm (I believe?) so there is a 10mm gap between GPUs.

ZRTK-21613 motherboard & ZRTD-101 backplane:


That same company, Zrt Co Ltd, makes a case as well, and sells fully populated miners with GPUs (https://zhiruitong.en.made-in-china.com/product/jyoEvXaGXUWp/China-Eth-etc-Zec-9-Pcie-Slot-Miner-Plug-with-8-or-9-GPU.html) They are an OEM. Others resell these miners, for example: GigaWatt Alpha 200, and Bitmain G1 miner (whatever happened to the G1 by the way? It sounds like it was announced but they never got around to actually distributing it?)

I curated a list of all motherboards with 8 or more PCIe slots. I have full frontal pictures for hardware porn addicts  

http://bitcoin.zorinaq.com/many_pcie/

You were, of course, absolutely right. I looked at the e9's pictures too quickly and misjudged it.


As I said, I thought they tweaked voltage & clock. You can cover a wide range of different energy efficiency levels by doing so.

Anyway, it's nice to see one more ASIC manufacturer coming to the market.

Nice pics & review. Out of sheer curiosity, I wish you had taken pictures of the other side of the 2 PCBs that hold the PCIe power connectors   It looks like you might have the first 821 released to the public. Is this correct?

209 comments over 9 months and no one pointed out that the "Ebit e9" miner seems to be a clone of the Bitmain Antminer S9/T9? Even their product page http://miner.ebang.com.cn/en/product/product-89-151.html shares design elements with the S9 product page https://shop.bitmain.com/productDetail.htm?pid=00020161116015054858d0tUnBE6067E It seems that ebang just tweaked a few things (quieter fans? fewer chips? different voltage/clock?) but other than that it seems to be the same product. So ebang would be lying to say they use a custom chip "DW1227". Someone open up an "Ebit e9", examine the PCB, examine chips, and I'm pretty sure you will find a PCB similar to the S9/T9 and Bitmain BM1387 chips...

September 15: HitBTC still doesn't allow withdrawal of WTT tokens... No communication. No ETA. Nothing. At this point I recommend to not trust them. (Thankfully I'm not a HitBTC user.)