Ryzen 3000 PCIe and the X570 chipset
Ryzen 3000 (Matisse) delivers 24 lanes PCIe 4.0
Ryzen 3000 the CPUs will have a total of 24 PCIe Gen4 lanes, indeed Gen 4.0. Four out of the twenty-four are used for the interconnect to the X570 chipset, leaving 20 lanes Gen 4.0 for other utilization. As expected, 16 lanes (PCIe x16) are intended for graphics cards that are connected as x16 or twice x8 once. One x8 link would offer PCIe 3.0 x16 like bandwidth. Four more PCIe lanes from the CPU are designed for fast storage such as NVMe SSDs. In addition to all that sidenote, AMD has integrated USB 3.0 Gen2 support into the CPU, that means you get four 10 Gbps USB ports at SuperSpeed.
The X570 chipset delivers another 16 lanes PCIe 4.0
When we move to the X570 chipset, it offers 16 additional lanes of PCIe Gen 4.0, and these can be re-routed and shared so per motherboard things are differently connected. PCIe slots, M.2 SSDs, LAN, card readers or WiFi modules are to be connected via the new interface standard. The configuration depends on the respective motherboard.
X570 PCH actually includes sixteen PCIe lanes, in addition to the 24 PCIe lanes on the CPU, with a total of 4 (four) 4-lane physical interfaces (4x PCIe 4.0 x4 PHY), fully configurable in PCIe x16, x8, x4, x2, x1, and SATA modes. Please do keep in mind that only Ryzen 3000 (Zen2) will open up X570 to the CPU at PCIe 4.0 x4. If a Ryzen 3000 family proc is used, or say an APU based on older architecture, the chipset connection will be made with PCIe 3.0. The X570 PCH (Platform Controller Hub) is also credited with a large number of USB ports of USB 3.1 and USB 2.0 and SATA for HDD / SSD. In the block diagrams, you can see examples of the configurations.
On the tweaking front you are going to notice improved overclocking options, both windows software based as well as the BIOS, this, of course, we'll detail in-depth in our reviews.
Tuning Ryzen 3000
BIOS Overclocking has been improved with a new OC menu and a one-stop click function for overclocking. Memory overclocking has become a thing as well, AMD has been able to reach DDR-5100 with overclocking (on air). There is an all-new Ryzen master software for the Windows overclockers at launch. Full DDR4 control is present with profile im/export functionality. It has new precision boost overdrive and Auto OC support. Overall you can expect a +200 MHz boost. XFP/ precision Boost overclocking (PBO) will now support automatic one clock overclocking, depending on cooling you get a default 100 MHz overclock, and if you toggle a button, up to 200 MHz
The above slide I did want to add is about precision boost (XFR), it is back and depending on your looing performance can add 200 MHz with automated overclocking. The fastest processor with its 16 cores runs default with 4700 MHz turbo bins, so you can see where that is headed.