VMG1312 Vs VMG3925
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 | 4 Ports 10/100M (To SoC) |
4 Ports 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 WAN/LAN<>WLAN would be limited to the bandwidth of the single Gigabit PHY inside assuming no other limiting factors ie WAN speed, WLAN radio bandwidth.