Both the P15S-P15F adapter and the SATA controller have arrived so I was finally able to do some testing. According to the P14S-P14FP Extender Board documentation, it supports "PCI Express base Specification 1.1 (Up to 2.5Gpbs)". I'm not sure where the "2.5Gpbs" comes from, maybe it's a mistake. PCIe Gen 1.1 supports 2.5 GT/s per lane and the card supports two lanes. (It's an X4 slot because X2 slots does not exist) Still, maybe the fastest possible throughput is what you're after. That could be because you're running business applications across your network, or because you're in the market for a gaming router or especially a Wi-Fi 6 router. If so, be sure to test the connection between your endpoints to ensure you're getting the maximum traffic speeds you can. PCMag thoroughly tests all routers and range extenders that come through its doors so you'll have a good idea of what to expect before you buy. (Credit: Linksys) While fairly easy to configure, range extenders have their limitations. They often use a separate network SSID that you have to log into as you move through the house, and Wi-Fi speeds are typically half of what you get from your main router. Most dual-band extenders use both radio bands to transmit data to and from the router, which means devices connecting to the extender are competing for bandwidth with the router. To help alleviate network congestion, some manufacturers let you dedicate a band for router-to-extender communications. Netgear's Fastlane technology and Amped Wireless' BoostBand technology are good examples. The length of the wire refers to the part of the visible wire. It does not include the PCB and the connector. For the wire length, please refer to the 5cm blue arrow in the figure below.

Get the cable out of the NUC. If you have the NUC5i5MYHE, you can remove the serial port bezel and put the cable through. Do you hate switching between network names as you move in and out of range? It's annoying, but if you've already got a cutting-edge Wi-Fi 6 router, you're probably reluctant to ditch it in favor of a whole new mesh system. The EAX15 is a good alternative in this situation, extending the Wi-Fi signal to previously underserved locations in your house while letting you roam seamlessly from room to room without worrying about the name of the network you're on. The slightly older 4th Gen NUCs had a Mini PCIe slot that allowed an additional NIC to be installed. With that port it was possible to install a Syba Mini PCIe NIC for example. Nevertheless the adapter is unsupported with ESXi and did not fit into the NUC chassis, there are solutions. If your router is having trouble delivering a strong Wi-Fi signal to certain areas of your home but you loathe the thought of switching between differently named networks for different parts of your house, the Netgear EAX15 can help. It’s easy to install, and you can use it to create a mesh-like network without buying a whole new mesh system, since it supports single-SSID naming for seamless roaming. It also supports the latest Wi-Fi 6 technology, and it delivered solid performance on the 5GHz band in our testing. Who It's For I have then attempted to use a combo adapter which uses USB for bluetooth and PCIe for wi-fi. Interestingly, only the USB bluetooth adapter is detected and not the wifi adapter that is using the PCIe interface.Form Factors - M.2 devices are denoted using a WWLL naming schemes, where "WW" specifies the modul width and "LL" specifies the module length. You can find notation like "M.2 2280 Module" in the NUC documentation. When shopping for a range extender, it's important to find one that matches your router's specs. For example, if you have a dual-band AC1900 router, get a dual-band AC1900 extender (or better). If your router supports Multi-User Multiple Input Multiple Output (MU-MIMO) data streaming, which provides enhanced performance by sending data to compatible clients simultaneously rather than sequentially, look for an extender that supports this technology if you want to extend your MU-MIMO network. Whereas range extenders communicate with the router via the 2.4GHz or 5GHz radio bands, most Wi-Fi system satellites use mesh technology to talk to the router, and to each other. Each node serves as a hop point for other nodes in the system, which helps the nodes farthest from the router to deliver a strong Wi-Fi signal as they talk to other nodes and don't rely on one-to-one communications with the router. The Key E slot is used for a WiFi adapter. The Key B ports is typcially used for a M.2 SSD. But according to the specification, they should theoretically provide the following interfaces:

Some words about the performance. The NUCs M.2 slot is based on PCI Express (PCIe) Revision Gen2 and has 2 lanes (X2). Each lane supports a data transfer speed of 5.0 GT/s (Gigatransfers per second). To get the actual usable bandwidth, you have to take into account that PCIe Gen 2 uses a 8b10b encoding which means that it requires 10bits, to transfer 1 byte (8 bits).M.2 is also known as Next Generation Form Factor (NGFF). It is a specification for internally mounted computer expansion cards. It is the successor to the mSATA standard, which uses the PCIe Mini Card physical card layout and connectors. M.2 is a very flexible standard that allows different module sizes and various interfaces. As M.2 cards are available in many possible variations, they are divided into different Form Factors and Keys. If you know you don't need Wi-Fi 6, but still need a reliable way to extend a network that sees frequent use from multiple data-intensive streams at a time, the Nighthawk X4 is one of your best options.

Well, when I opened up the application menu again, it was significantly faster. I thought there was no way the thing actually rebooted. So, I ran the good ol’ mount command and looked for the trusty root partition. Lo and behold, it was on the NVMe drive. The P15S-P15F adapter has a Key E interface which is the second M.2 slot on the NUC5i5MYHE. It converts the M.2 slot to an Mini PCIe slot. (As a side note, I didn't manage to get the P15S-P15F to work in my NUC but I'm currently trying to find out why.) M.2 and PCIe Voltage Issue My solution at this stage is to use a USB 3.0 to SATA adapter. This is by no means ideal, but it works :)While knowing that PCIe is compatible to M.2, the only thing you need is an adapter, right? Simple, but these kind of adapters appear to be very uncommon. I could only find these two adapters from a company called Bplus: To sum things up - I know for fact that there is a functional PCIe lane in the M.2 port. The adapter fits. Power and USB work, PCIe doesn't. Intel refuse to provide support and claim that the product was not intended to be used in this configuration. With a benchmark setup of 100 samples of 1000MB each, the average read was 673MB/s and the average write speed was 789MB/s. The average access time across 1,000 samples was 0.06 milliseconds. These are incredibly impressive numbers. The RK3399 is a beast in terms of SBCs, but it still pales in comparison to most x86 CPUs. It might — just might — compare to some Atom CPUs. vmnic4 0000:05:00.1 igb Up Down 0 Half 00:1b:21:93:b3:b3 1500 Intel Corporation 82576 Gigabit Network Connection