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Comparison ASRock B850M Pro RS vs ASRock B850M Pro-A

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ASRock B850M Pro RS
ASRock B850M Pro-A
ASRock B850M Pro RSASRock B850M Pro-A
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from $140.44 
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Featuresfor home/officefor home/office
SocketAMD AM5AMD AM5
Form factormicro-ATXmicro-ATX
Power phases1111
VRM heatsink
LED lighting
Lighting syncASRock Polychrome Sync
Size (HxW)244x244 mm244x244 mm
Chipset
ChipsetAMD B850AMD B850
BIOSAmiAmi
UEFI BIOS
RAM
DDR54 slot(s)4 slot(s)
Memory moduleDIMMDIMM
Operation mode2 channel2 channel
Max. clock frequency8000 MHz8000 MHz
Max. memory256 GB256 GB
XMP
EXPO support
Drive interface
SATA 3 (6Gbps)44
M.2 connector33
M.23xPCI-E 4x3xPCI-E 4x
M.2 version1x5.0, 2x4.01x5.0, 2x4.0
M.2 SSD cooling
Integrated RAID controller
Expansion slots
PCI-E 4x slots11
PCI-E 16x slots11
PCI Express5.05.0
Steel PCI-E connectors
Internal connections
TPM connector
USB 2.022
USB 3.2 gen122
USB C 3.2 gen111
ARGB LED strip33
RGB LED strip11
Video outputs
HDMI output
HDMI versionv.2.1v.2.1
DisplayPort
DisplayPort versionv.1.4v.1.4
Integrated audio
AudiochipRealtek ALC897Realtek ALC897
Sound (channels)7.17.1
Network interfaces
LAN (RJ-45)2.5 Gbps2.5 Gbps
LAN ports11
LAN controllerDragon RTL8125BGDragon RTL8125BG
External connections
USB 2.044
USB 3.2 gen122
USB 3.2 gen211
USB C 3.2 gen211
BIOS FlashBack
Power connectors
Main power socket24 pin24 pin
CPU power8+4 pin8+4 pin
Fan power connectors55
CPU Fan 4-pin22
Chassis/Water Pump Fan 4-pin33
Added to E-Catalogjanuary 2025january 2025
Glossary

LED lighting

The presence of its own LED backlight on the motherboard. This feature does not affect the functionality of the "motherboard", but gives it an unusual appearance. Therefore, it hardly makes sense for an ordinary user to specifically look for such a model (a motherboard without backlighting is enough for him), but for modding lovers, backlighting can be very useful.

LED backlighting can take the form of individual lights or LED strips, come in different colours (sometimes with a choice of colours) and support additional effects — flashing, flickering, synchronization with other components (see "Lightning synchronization"), etc. Specific features depend on the motherboard model.

Lighting sync

Synchronization technology provided in the board with LED backlight (see above).

Synchronization itself allows you to "match" the backlight of the motherboard with the backlight of other system components — cases, video cards, keyboards, mice, etc. Thanks to this matching, all components can change colour synchronously, turn on / off at the same time, etc. Specific features the operation of such backlighting depends on the synchronization technology used, and, usually, each manufacturer has its own (Mystic Light Sync for MSI, RGB Fusion for Gigabyte, etc.). The compatibility of the components also depends on this: they must all support the same technology. So the easiest way to achieve backlight compatibility is to collect components from the same manufacturer.
ASRock B850M Pro-A often compared