VMG1312 Vs VMG3925

ZyXEL VMG1312-B10D

ZyXEL VMG3925-B10B

Thais page describes the differences between the ZyXEL VMG1312-B10D and the ZyXEL VMG3925-B10B routers.

The main differences are:

• VMG3925 is more expensive
• VMG3925 has 2.4 and 5G WiFi radio, the VMG1312 has only 2.4G
• VMG3925 has Gigabit Ethernet ports, the VMG1312 has 100M ports
• VMG3925 is physically larger, even though they are a similar shape
• VMG3925 has a dedicated WAN Ethernet port, the VMG1312 has a shared LAN/WAN Ethernet port
• VMG3925 has a better wall mount

Detailed differences

	VMG1312-B10D	VMG3925-B10B
Dimensions with stand (mm)	160Wx115Hx60D	185Wx147Hx85D
Wall mountable	Suboptimal	Yes
PSU Rating	12V 1A	12V 2A
CPU/SoC	Broadcom BCM63381	Broadcom BCM63168
Architecture	BMIPS4350	BMIPS4350
CPU Cores	2	2
CPU Frequency	600MHz	400MHz
RAM	64MB	128MB
Flash	128MB	128MB
Switch chipset	Onboard the BCM63381 SoC	BCM53125 (Discrete)
LAN Ethernet	10/100M (To SoC)	10/100/1000M (To Switchchip)
WAN Ethernet	Virtual port from LAN 4	Dedicated 10/100/1000M port (To Switchchip)
Wireless Protocols	802.11 b/g/n	802.11 a/b/g/n/ac
2.4GHz Wireless	Yes	Yes
2.4GHz radio chains	2	2
2.4GHz chipset	BCM43227 (Discrete)	BCM6362 (On BCM63168 SoC)
5GHz Wireless	No	Yes
5GHz radio chains	N/A	3
5GHz chipset	N/A	Broadcom BCM43602 (Discrete) SKY85712-21 RF Front-End
xDSL Chipset	Broadcom BCM6303 ADSL/VDSL	Broadcom BVM6302 ADSL/VDSL
USB	Yes, 2.0	Yes, 2.0

You may note that the VMG3925-B10B has a slower CPU, however it also contains more dedicated hardware for packet processing compared to the VMG1312-B10D which needed the extra CPU clock cycles to deal with processing packets.

The VMG3925-B10B's SoC contains 1 Gigabit PHY, which connects to the Switch chip for the WAN and LAN ports. Radios are connected to the SoC, so packets passing through LAN<>WLAN or WAN<>WLAN would be limited to the bandwidth of the single Gigabit PHY inside.