Key takeaways
- Look up the model on the ASUS support site and note the date of the latest firmware.
- Disable features you do not use that expose the router: Web Access from WAN, AiCloud, port forwarding you no longer need.
- Some AC models are supported by community firmware such as Asuswrt-Merlin, but support for older Broadcom models has also been winding down, so do not count on it for years.
The best ASUS AC dual-band router for most people in 2026 is still the RT-AC68U class (AC1900, 3×3, gigabit ports) if you can get one cheaply, with the RT-AC86U as the faster pick for gigabit plans; but because ASUS has moved its lineup to Wi-Fi 6 and Wi-Fi 7 and many 802.11ac models have reached end of firmware support, an entry-level ASUS Wi-Fi 6 router is often the smarter buy at a similar price. This guide compares the AC models people still search for, explains what the “3×3” and “AC1900” labels mean, and shows when an older AC router is still a sensible choice.
ASUS 802.11ac dual-band models compared
| Model | Class | 5 GHz max link | 2.4 GHz max link | Streams (5 GHz) | CPU | Ports |
|---|---|---|---|---|---|---|
| RT-AC1200 | AC1200 | 867 Mbps | 300 Mbps | 2×2 | Single-core MediaTek (varies by revision) | 1 WAN + 4 LAN (10/100 on early versions) |
| RT-ACRH13 | AC1300 | 867 Mbps | 400 Mbps | 2×2 MU-MIMO | Quad-core Qualcomm IPQ4018 | 1 WAN + 4 LAN gigabit, USB 3.0 |
| RT-AC66U B1 | AC1750 | 1300 Mbps | 450 Mbps | 3×3 | Dual-core 1 GHz Broadcom | 1 WAN + 4 LAN gigabit, USB 3.0 + 2.0 |
| RT-AC68U | AC1900 | 1300 Mbps | 600 Mbps (TurboQAM) | 3×3 | Dual-core 800 MHz–1 GHz Broadcom (by revision) | 1 WAN + 4 LAN gigabit, USB 3.0 + 2.0 |
| RT-AC1900P | AC1900 | 1300 Mbps | 600 Mbps | 3×3 | Dual-core 1.4 GHz Broadcom | 1 WAN + 4 LAN gigabit, USB 3.0 + 2.0 |
| RT-AC86U | AC2900 | 2167 Mbps | 750 Mbps | 4×4 (5 GHz) | Dual-core 1.8 GHz Broadcom | 1 WAN + 4 LAN gigabit, USB 3.0 + 2.0 |
| RT-AC88U | AC3100 | 2167 Mbps | 1000 Mbps | 4×4 | Dual-core 1.4 GHz Broadcom | 1 WAN + 8 LAN gigabit |
All of these are dual-band (one 2.4 GHz and one 5 GHz radio). The tri-band AC models such as the RT-AC5300 are a separate category and are not covered here.
What the labels actually mean
AC1900 and similar numbers
The AC number adds up the maximum link rates of both bands: 1300 Mbps on 5 GHz plus 600 Mbps on 2.4 GHz equals “AC1900”. No single device ever sees that number. A typical laptop with a 2×2 Wi-Fi 5 card connects to a 3×3 AC1900 router at up to 867 Mbps, and real file-transfer throughput close to the router is usually around half to two-thirds of the link rate.
3×3 dual band
“3×3” means three transmit and three receive antennas or chains per band. It helps range and stability for 3×3 clients (some older MacBooks) and gives slightly better signal for 2×2 clients through beamforming, but phones (mostly 2×2) do not get a 50 percent speed jump.
Gigabit router
“Gigabit” refers to the Ethernet ports: 1000 Mbps WAN and LAN. It matters if your internet plan is above 100 Mbps. Avoid early RT-AC1200 versions with 10/100 ports on any plan faster than about 90 Mbps.
Real-world speed expectations
Wireless throughput depends on walls and distance far more than the box label. As a rough guide for a 2×2 Wi-Fi 5 laptop:
| Location | AC1200 / AC1300 class | AC1900 class | AC2900 class |
|---|---|---|---|
| Same room, 5 GHz | 300–500 Mbps | 400–600 Mbps | 500–700 Mbps |
| One wall, 5 GHz | 200–350 Mbps | 250–450 Mbps | 300–500 Mbps |
| Two floors away | Often drops to 2.4 GHz, 30–100 Mbps | 50–150 Mbps | 60–180 Mbps |
These are typical ranges reported for each class, not guarantees. If your plan is 300 Mbps or less, an AC1900 router can usually deliver it over Wi-Fi in nearby rooms; for 500 Mbps to 1 Gbps plans, the RT-AC86U or a Wi-Fi 6 router gets closer.
The 2026 catch: firmware support
The biggest issue with any 802.11ac router in 2026 is software, not speed. ASUS has listed many AC models, including the RT-AC68U and RT-AC86U families, as end-of-life, which means security updates have stopped or become rare. A router is the device facing the internet, so unpatched firmware is a real risk.
- Look up the model on the ASUS support site and note the date of the latest firmware.
- Disable features you do not use that expose the router: Web Access from WAN, AiCloud, port forwarding you no longer need.
- Some AC models are supported by community firmware such as Asuswrt-Merlin, but support for older Broadcom models has also been winding down, so do not count on it for years.
Decision matrix
| Your situation | Pick | Why |
|---|---|---|
| Already own an RT-AC68U and plan is under 300 Mbps | Keep it, update firmware, lock down remote features | Still capable; upgrade when updates stop entirely |
| Buying used, small apartment, plan under 200 Mbps | RT-AC66U B1 or RT-AC68U | 3×3 range, gigabit ports, low used prices |
| 500 Mbps–1 Gbps plan | RT-AC86U, or better a Wi-Fi 6 model like RT-AX58U | Faster CPU and 4×4 5 GHz |
| Need many wired devices | RT-AC88U | Eight LAN ports avoid a separate switch |
| Buying new in 2026 | Entry ASUS Wi-Fi 6 such as RT-AX55 or RT-AX58U | Current firmware, WPA3, better with many devices |
| Large or multi-floor home | AiMesh: two AC or AX routers, or a mesh kit | One router rarely covers 2,500+ sq ft well |
Pricing and value
New AC routers from ASUS are increasingly hard to find in 2026, and remaining stock is sometimes priced close to entry Wi-Fi 6 models. As broad ranges: used RT-AC68U and RT-AC66U B1 units often sell for roughly $20–$50, used RT-AC86U for about $40–$80, while new entry ASUS Wi-Fi 6 routers usually sit around $70–$150. When the price gap is small, Wi-Fi 6 is the better buy because of longer firmware support and better handling of crowded networks.
Ownership realities of older ASUS AC routers
- Heat: the RT-AC68U and RT-AC86U run warm; keep them upright on their stands with open space around vents.
- Known failure points: some RT-AC86U units developed problems over time, and the power adapters on aging routers can fail; a replacement 19V adapter of the correct rating is a common fix.
- AiMesh: many of these models can join AiMesh, so an old RT-AC68U can serve as a mesh node for a newer ASUS router, which is often a better use than keeping it as the main router.
- Reset when reusing: do a factory reset and set a new admin password before redeploying a second-hand unit.
Bottom line
An ASUS AC1900 or AC2900 dual-band router still moves data fast enough for most homes on plans up to a few hundred megabits. The reason to buy one in 2026 is low cost, ideally as a used unit or an AiMesh node. If you are buying new or the router will be your only line of defense on the internet, choose an ASUS Wi-Fi 6 model with active firmware support instead.
