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Comparison Asus ROG STRIX B850-A GAMING WIFI vs Asus ROG STRIX X870-A GAMING WIFI

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Asus ROG STRIX B850-A GAMING WIFI
Asus ROG STRIX X870-A GAMING WIFI
Asus ROG STRIX B850-A GAMING WIFIAsus ROG STRIX X870-A GAMING WIFI
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M.2_2 shares bandwidth with PCIEX16(G5). When M.2_2 is occupied by SSD device, PCIEX16(G5) will work as x8. M.2_3 shares bandwidth with PCIEX16(G4). When M.2_3 is occupied by SSD device, PCIEX16(G4) will be disabled.
Featuresgaming for overclockinggaming for overclocking
SocketAMD AM5AMD AM5
Form factorATXATX
Power phases1820
VRM heatsink
LED lighting
Lighting syncAsus Aura SyncAsus Aura Sync
Size (HxW)305x244 mm305x244 mm
Chipset
ChipsetAMD B850AMD X870
BIOSAmiAmi
UEFI BIOS
RAM
DDR54 slot(s)4 slot(s)
Memory moduleDIMMDIMM
Operation mode2 channel2 channel
Max. clock frequency8000 MHz8000 MHz
Max. memory192 GB192 GB
EXPO support
Drive interface
SATA 3 (6Gbps)22
M.2 connector44
M.24xPCI-E 4x4xPCI-E 4x
M.2 version1x5.0, 3x4.02x5.0, 2x4.0
M.2 SSD cooling
Integrated RAID controller
Expansion slots
PCI-E 16x slots22
PCI Modes16x/4x16x/4x
PCI Express5.05.0
Steel PCI-E connectors
Internal connections
USB 2.022
USB 3.2 gen112
USB C 3.2 gen21
USB C 3.2 gen2x21
USB41
ARGB LED strip33
More featuresPower button
Video outputs
HDMI output
HDMI versionv.2.1v.2.1
DisplayPort
DisplayPort versionv.1.4v.1.4
Integrated audio
AudiochipROG SupremeFXROG SupremeFX
AmplifierSavitech SV3H712 AMPSavitech SV3H712 AMP
Sound (channels)7.17.1
Optical S/P-DIF
Network interfaces
Wi-FiWi-Fi 7 (802.11be)Wi-Fi 7 (802.11be)
BluetoothBluetooth v 5.4Bluetooth v 5.4
LAN (RJ-45)2.5 Gbps2.5 Gbps
LAN ports11
LAN controllerIntelIntel
External connections
USB 2.02
USB 3.2 gen144
USB 3.2 gen225
USB C 3.2 gen211
USB C 3.2 gen2x21
USB42
Alternate Mode
BIOS FlashBack
Clear CMOS
Power connectors
Main power socket24 pin24 pin
CPU power8+8 pin8+8 pin
Fan power connectors78
CPU Fan 4-pin22
CPU/Water Pump Fan 4-pin11
Chassis/Water Pump Fan 4-pin45
Added to E-Catalogjanuary 2025august 2024
Glossary

Power phases

The number of processor power phases provided on the motherboard.

Very simplistically, phases can be described as electronic blocks of a special design, through which power is supplied to the processor. The task of such blocks is to optimize this power, in particular, to minimize power surges when the load on the processor changes. In general, the more phases, the lower the load on each of them, the more stable the power supply and the more durable the electronics of the board. And the more powerful the CPU and the more cores it has, the more phases it needs; this number increases even more if the processor is planned to be overclocked. For example, for a conventional quad-core chip, only four phases are often enough, and for an overclocked one, at least eight may be needed. It is because of this that powerful processors can have problems when used on inexpensive low-phase motherboards.

Detailed recommendations on choosing the number of phases for specific CPU series and models can be found in special sources (including the documentation for CPU itself). Here we note that with numerous phases on the motherboard (more than 8), some of them can be virtual. To do this, real electronic blocks are supplemented with doublers or even triplers, which, formally, increases the number of phases: for example, 12 claimed phases can represent 6 physical blocks with doublers. However, virtual phases are much inferior to real ones in terms of capabilities — in fact, t...hey are just additions that slightly improve the characteristics of real phases. So, let's say, in our example, it is more correct to speak not about twelve, but only about six (though improved) phases. These nuances must be specified when choosing a motherboard.

Chipset

The chipset model installed in the motherboard. AMD's current chipset models are B450, A520, B550, X570, A620, B650, B650E, X670, X670E, B840, B850, X870, X870E. For Intel, in turn, the list of chipsets looks like this: X299, H410, B460, H470, Z490, H510, B560, H570, Z590, H610, B660, H670, Z690, B760, Z790, H810, B860, Z890.

A chipset is a set of chips on the motherboard through which the individual components of the system inter...act directly: the processor, RAM, drives, audio and video adapters, network controllers, etc. Technically, such a set consists of two parts — the north and south bridges. The key element is the northbridge, it connects the processor, memory, graphics card and the southbridge (together with the devices it controls). Therefore, it is often the name of the north bridge that is indicated as the chipset model, and the south bridge model is specified separately (see below); it is this scheme that is used in traditional layout motherboards, where bridges are made in the form of separate microcircuits. There are also solutions where both bridges are combined in one chip; for them, the name of the entire chipset can be indicated.

Anyway, knowing the chipset model, you can find various additional data on it — from general reviews to special instructions. An ordinary user, usually, does not need such information, but it can be useful for various professional tasks.

M.2 version

The version of the M.2 interface determines both the maximum data transfer rate and the supported devices that can be connected via physical M.2 connectors (see the corresponding paragraph).

The version of the M.2 interface in the specifications of motherboards is usually indicated by the number of connectors themselves and by the PCI-E revision provided for in each of them. For example, the entry “3x4.0” means three connectors capable of supporting PCI-E 4.0; and the designation “2x5.0, 1x4.0” means a trio of connectors, two of which support PCI-E 4.0, and another one supports PCI-E 5.0.

USB 3.2 gen1

The number of USB 3.2 gen1 connectors provided on the motherboard.

USB connectors (all versions) are used to connect to the "motherboard" USB ports located on the outside of the case (usually on the front panel, less often on the top or side). With a special cable, such a port is connected to the connector, while one connector, usually, works with only one port. In other words, the number of connectors on the motherboard corresponds to the maximum number of case USB connectors that can be used with it. At the same time, we note that in this case we are talking about traditional USB A connectors; connectors for newer USB-C are mentioned separately in the specifications.

Specifically, USB 3.2 gen1 (formerly known as USB 3.1 gen1 and USB 3.0) provides transfer speeds of up to 4.8 Gbps and more power than the earlier USB 2.0 standard. At the same time, USB Power Delivery technology, which allows you to reach power up to 100 W, is usually not supported by this version of USB A connectors (although it can be implemented in USB-C connectors).

USB C 3.2 gen2

The number of USB-C 3.2 gen2 connectors provided in the motherboard.

USB-C connectors (all versions) are used to connect to the "motherboard" USB-C ports located on the outside of the case (usually on the front panel, less often on the top or side). With a special cable, such a port is connected to the connector, while one connector, usually, works with only one port. In other words, the number of connectors on the motherboard corresponds to the maximum number of USB-C chassis connectors that can be used with it.

Recall that USB-C is a relatively new type of USB connector, it is distinguished by its small size and double-sided design; such connectors have their own technical features, so separate connectors must be provided for them. Specifically, the USB 3.2 gen2 version (formerly known as USB 3.1 gen2 and USB 3.1) operates at speeds up to 10 Gbps and allows you to implement USB Power Delivery technology, thanks to which the power supply of USB peripherals can reach 100 W per port. However, the presence of Power Delivery in specific motherboards (and even in specific connectors on the same board) should be specified separately.

USB C 3.2 gen2x2

The number of USB-C 3.2 gen2x2 ports provided on the motherboard.

USB-C is a universal connector. It is slightly larger than microUSB, has a convenient double-sided design (it doesn’t matter which side you connect the plug), and also allows you to implement increased power supply and a number of special functions. In addition, the same connector is standardly used in the Thunderbolt v3 interface, and technically it can be used for other interfaces.

As for the specific version of USB-C 3.2 gen2x2, it allows you to achieve a connection speed of 20 Gbps — that is, twice as fast as USB-C 3.2 gen2, hence the name. It is also worth noting that the connection according to the 3.2 gen2x2 standard is implemented only through USB-C connectors and is not used in ports of earlier standards.

USB 2.0

The number of USB 2.0 connectors installed on the back of the motherboard.

Recall that USB is the most popular modern connector for connecting various external peripherals — from keyboards and mice to specialized equipment. And USB 2.0 is the oldest version of this interface that is relevant today; it is noticeably inferior to the newer USB 3.2 both in terms of speed (up to 480 Mbps), and in terms of power supply and additional functionality. On the other hand, even such characteristics are often enough for undemanding peripherals (like the same keyboards / mice); and devices of newer versions can be connected to the connectors of this standard — there would be enough power supply. So this version of USB is still found in modern motherboards, although there are fewer and fewer new models with USB 2.0 connectors.

Note that in addition to the connectors on the rear panel, connectors on the board itself (more precisely, ports on the PC case connected to such connectors) can also provide a USB connection. See below for more on this.

USB 3.2 gen2

The number of native USB 3.2 gen2 connectors provided on the back of the motherboard. In this case, we mean traditional, full-size USB A ports.

USB 3.2 gen2(formerly known as USB 3.1 gen2 and simply USB 3.1) is the evolution of USB 3.2 after version 3.2 gen1 (see above). This standard provides connection speeds up to 10 Gbps, and to power external devices in such connectors, USB Power Delivery technology (see below) can be provided, which allows you to output up to 100 W per device (however, Power Delivery support is not mandatory, its presence should be specified separately). Traditionally for the USB standard, this interface is backwards compatible with previous versions — in other words, you can easily connect a device supporting USB 2.0 or 3.2 gen1 to this port (unless the speed will be limited by the capabilities of a slower version).

The more connectors provided in the design, the more peripheral devices can be connected to the motherboard without the use of additional equipment (USB splitters). In some models of motherboards, the number of ports of this type is 5 or even more. At the same time, we note that in addition to the connectors on the rear panel, connectors on the board itself (more precisely, ports on the case connected to such connectors) can also provide a USB connection. See below for more on this.

USB C 3.2 gen2x2

The number of USB C 3.2 gen2x2 connectors provided on the back of the motherboard.

USB-C is a relatively new type of connector used in both portable and desktop PCs. It has a small size and a convenient double-sided design, thanks to which the plug can be inserted into the connector in either direction. And version 3.2 gen2 connectivity (formerly known as "just USB 3.2") provides data transfer speeds up to 20 Gbps and supports USB Power Delivery technology, which allows you to supply power to external devices up to 100 watts. However, the presence of Power Delivery should be specified separately, this function is not mandatory.

As for the quantity, most often there is only one such port in modern motherboards. This is primarily due to the fact that not so many peripherals with a USB-C plug are produced for desktop PCs — full-sized USB A are still more popular. In addition, the USB 3.2 gen 2x2 version itself appeared relatively recently and is only gaining popularity.
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