One of the secondary stories from Computex was that AMD and its partners were set up to launch a new generation of medium sized chipsets and motherboards with the new lower power version of the chipset. The B450 chipset is the direct sequel to the B350, with lower power and features like Precision Boost 2, XFR2 and StoreMI support. The planned release of 25+ motherboard models is sure to add variety to the market, and we take a quick look at all the boards before launch from suppliers like MSI, ASRock, ASUS and GIGABYTE.
What's New With the B450 Chipset?
The new B450 chipset launch complements the release of Ryzen 2000 Series Processors, with AMD looking at current medium and high-end parts. The B450 chipset is designed to be a cheaper entry point in the ecosystem, although users pick up the eight-core Ryzen 2700X ($ 329) and hex-core Ryzen 2600X ($ 229) units and go to overclocking.
Like the already released X470 Promontory chipset, the B450 chipset is the direct sequel to the former first generation B350 chipset. Not much has changed on the surface with regard to USB connectivity, storage options and PCI paths, but AMD has added a couple of new technologies to boost the appeal to the new budget-focused chipset.
|AMD AM4 Chipsets ||DDR4||OC||USB||SATA|| PCIe
|X370||2667||Y||2||6||6||6||6||] 6||8||x8 / x8||N **||N ^||6.8W||0.1.10|
|B450||2667+||Y  2||2||6||6 *||6||x16||Y||Y||4.8 W||0.1.10||6||4||6||x16||N **||N ^||6.8W||2||19659021] 1||2||6||4||4||4||x16||N **||0, 1.10|
|A320||2667||N||19659021] N ^||6.8W||0.1.10||–|
|X300||2667 [19||0||4||0||2  4||x8 / x8  N||N||0.1||2667||N||0||4||0||2  4||x16||N||N||0.1||–|
* possibly four double check with AMD
** May be possible with BIOS updates, will be motherboard dependent
^ Can be activated with specific CPUs if a license has been purchased
While the specifications on the surface make the B450 appear as a carbon copy of the B350 chipset, as they share original support for the same USB configuration, have the same SATA configuration, Support for one single M.2 PCIe 3.0 x4 / SATA port, and six PCI paths dedicated to PCIe 2.0 slots. They also support the same PCIe 3.0 bifurcation, providing a single PCIe 3.0 x16 slot that focuses these systems on a single GPU.
Lower Power and StoreMI for All (on B450 and X470)
As with the jump from the X370 to the X470 chipsets, a primary difference from B350 to B450 comes through lower power consumption – the B450 chipset runs an integrated controller with lower power which reduces idle power with just under 2 W, from 6.8 W to 4.8 W.  Another major feature is AMD's StoreMI storage technology, which is not necessarily an addition to the chipset itself, but enabled through the B450. This allows users to unite the different storage spaces in the system to get the best event for the fastest access to data. StoreMI technology is further explained in our Ryzen 2700X, 2700, 2600X and 2600 processor reviews.
Precision Boost 2: No More Turbo Tables
One of the biggest changes related to the Ryzen 2000 series is how the processor performs its turbo. Up to this point (except for the last APU launch) processors depend on a step functionalization: the system determines how many threads that are loaded attempting to implement a particular frequency on those kernels if possible and then follows the lookup table related thread numbers to frequency. AMD's goal in Precision Boost 2 is to make this process more dynamic.
This image from AMD is how the feature is represented: the system will determine how much of the power budget is still available and turbo as much as possible until it hits one of the limitation factors. These factors may be some but not limited to the following:
- Total chip peak power
- Individual core voltage / frequency response
- Thermal interaction between neighboring nuclei
- Power supply limitations for individual nuclei / groups of cores
- Total thermal performance
Extended frequency range 2 (XFR2): Cooler = Faster, Right?
The following analysis on XFR2 comes from our previous AMD Ryzen 2700X, 2700, 2600X and 2600 review.
For the Ryzen 2000 series, AMD has changed what XFR does. In the previous generation, certain processors were applied to allow them to increase above the maximum turbine frequency when the thermal situation contributed to higher frequencies and higher voltage in low wire count states. For this generation, it still applies to thermals, but the definition applies to any core load: If the CPU is below 60ºC, the processor can increase regardless of what load is over the Precision Boost 2 frequency (so why not get better PB2 implementation?). The core must still be within a suitable voltage / frequency window to maintain stability.
Both Precision Boost 2 and Extended Frequency Range 2 are supported on the B450.
ASRock B450 Pro4
ASRock B450M Pro4
ASRock B450 Gaming K4
ASRock B450 Gaming ITX / ac
ASRock B450 Pro4
ASUS Strix B450-F Gaming
ASUS Strix B450 -I Gaming
ASUS TUF B450-Plus Gaming
ASUS TUF B450M-Plus Gaming
ASUS Prime B450-Plus
ASUS Prime B450M -K
GIGABYTE B450 Aorus M
GIGABYTE B450 Aorus Elite
GIGABYTE B450 Aorus Pro
GIGABYTE B450 Aorus Pro WiFi
GIGABYTE B450M DS3H
MSI B450 Gaming Plus
MSI B450M Gaming
MSI B450M Bazooka
MSI B450M Bazooka Plus  9] MSI B450M Mortar
MSI B450M Gaming Plus AC
MSI B450 Tomahawk
MSI B450M Bazooka
MSI B450M Mortar Titanium
MSI B450-A Pro
MSI B450M Pro-M2
MSI B450M Pro-VDH
Select Rich ig B450 Motherboard