The Wi-Fi is almost the same. The C64 costs a bit more - for gigabit ports and slightly faster 2.4 GHz.

Short answer

Archer C64 - gigabit WAN and 4 LAN, 400 Mbit/s on 2.4 GHz, a compact body. Archer C50 - 100 Mbit/s ports and cheaper.

Key differences

SpecTP-Link Archer C50TP-Link Archer C64
Typerouterrouter
Wi-FiWi-Fi 5, AC1200Wi-Fi 5, AC1200
Wi-Fi speed300 + 867 Mbit/s400 + 867 Mbit/s
Bands2.4 + 5 GHz2.4 + 5 GHz
WAN1 × 100 Mbit/s1 × 1 Gbit/s
LAN4 × 100 Mbit/s4 × 1 Gbit/s
Antennas4 external4 external
VPNyesyes
Dimensions, weight183×123.5×32.1 mm120×120×27.9 mm
Pricecurrent pricescurrent prices

Specs come from the device pages on Smartphone.ua.

Ports

WAN and 4 LAN: 100 Mbit/s vs 1 Gbit/s.

Wi-Fi

300 + 867 vs 400 + 867 Mbit/s.

What's the same

4 external antennas, VPN support.

Verdict: who should buy which

  • A plan above 100 Mbit/s - Archer C64.
  • Minimum budget - Archer C50.

FAQ

Is there VPN?
Yes, on both.

Is there USB?
No.

Which is cheaper?
The Archer C50.

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