Currently we only offer 3 and 4 slot NVLink. 

I run a Z370 micro (since no z390 micro). Isn't the z370 micro 2 slots as 2 normal cards are back to back with no space. The bottom slot is a x4.

The x299 would work though would need to redo my setup again.

Old School HB SLI Bridges, why the different names is only known by EVGA.

 
New School NVLink SLI Bridges NVIDIA Top EVGA Bottom At lest the Names are the Same this time around.
 
 

the_Scarlet_one
I thought the m.2 came off the pch instead of pulling from PCI lane 2 on the micro boards. I cannot find a definitely answer in the manual for the motherboard.

Yea, it is not very clear in the Manual.
On Z370 motherboards, the CPU and PCH are directly linked via DMI 3.0, which uses 4 lanes to provide transfer rates at up to 8 GT/s per lane. From there, the PCH allocates bandwidth to smaller PCIe slots and devices, such as M.2 Key-E, USB, audio, etc. In simplified terms, the PCH works as a hub for peripherals that are less bandwidth-intensive.
 
11. PCIe Slot x16/x8
PCIe x16/x8 slots are primarily for video cards. These full-length slots will provide 8 or 16 lanes of bandwidth to a full-size card, and are backwards-compatible with x8, x4, and x1-length cards.
Coffee Lake-S Socket 1151 processors have 16 PCIe lanes available for routing.
The 16 PCIe lanes are pulled from the CPU and shared with the x16 PCIe slot 2 (PE2). Lanes automatically switch from x16/x0 to x8/x8 when the motherboard detects a card in slot PE2.
12. PCIe Slot x8
PCIe x8 slots are primarily used for video cards, and share lanes from adjacent x16 slots, when populated. These full-length slots will provide 8 lanes of bandwidth to a full-size card, and are backwards-compatible with x8, x4, and x1-length cards.
This slot is limited to a maximum of 8 lanes as it shares bandwidth with the primary PCIe x16 slot 1 (PE1). This slot is primarily recommended for secondary video cards, such as the 2nd card in a SLI configuration, or a PhysX card.
13. PCIe Slot x4 PCIe Slot x4
PCIe x4 slot PE3 uses up to 4 Gen 3 lanes from the PCH. This slot is typically used for sound cards, WiFi, USB, LAN or other peripheral cards.
Using this slot will have *NO EFFECT* on the bandwidth or throughput of the x16 slots used for SLI because this slot uses only PCH bandwidth.
 
PCIe Slot Breakdown
PCIe Lane Distribution (All Socket 1151 processors provide 16 lanes.)
PE1 – x16 (Gen3, x16 lanes from CPU, x8 shared with PE2)
PE2 – x16 (Gen3, x8 lanes from CPU, shares 8 of PE1’s 16 lanes)
PE3 – x4 (Gen3, x4 lanes from PCH)
 
M.2 Slot Breakdown
M.2 Lane Distribution
M.2 Key-M (80mm) – x4
o M.2 Enable/Disable is set within the BIOS
M.2 Key-E (32mm) – x1
o M.2 Enable/Disable is set within the BIOS
 

I did have this posted but removed it.

bcavnaugh

seta8967
I run a Z370 micro (since no z390 micro). Isn't the z370 micro 2 slots as 2 normal cards are back to back with no space.

Yep We are all out of luck ATM even on the X299 Micro/2 we have no NVLink SLI Bridge support ATM.
But maybe EVGA will come out latter with a 0-Slot (2-Slot) NVLink SLI Bridge as the did for the Older HB SLI Bridges.
Note that Jeff said "Currently"
But then is it really practical to run Two RTX Cards on a mATX Motherboard.

The x299 micro can use the 3 slot nvlink, as it has a pcie x16 on the 3rd pcie slot. The z370 has a x4 there.

Why isn't it practical? It uses just the needed amount of space, same CPU as it's bigger brothers, same specs. The matx just removes the excess size of a atx. Sure it would be nice if EVGA released a z390 micro with 2x m.2 on the back like another company, but I'm fine with 2tb of m.2 and a external NAS.

I guess I will return my 2080's. Not like manufacturer will raise the price of what they are now.

They did make one for below Quadro Graphics Cards (Quadro RTX NVLink 2-Slot) / (Quadro RTX NVLink HB 2-Slot)
CHOOSE THE RIGHT NVLINK BRIDGE FOR YOUR QUADRO GPUs Only $600 Each
https://www.nvidia.com/en-us/design-visualization/nvlink-bridges/