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Wireless Reviews

Nighthawk AC1900 Smart WiFi Router
At a glanceAC1900 Router
June 2015
ProductNETGEAR R7000 Nighthawk AC1900 Smart WiFi Router   [Website]
SummarySecond generation Broadcom 802.11ac AC1900 router with storage sharing USB 2.0 & 3.0 ports and OpenDNS based parental controls
Pros• Has WDS, Client Bridge and AP modes
• USB 3.0 port
• Fast file transfers for both FAT32 & NTFS formats
Cons• No site survey in client bridge mode
• 600 Mbps in 2.4 GHz will rarely be experienced
• Not Wi-Fi Certified
• Can't adjust transmit power

Typical Price: $180  Compare Prices  Check Amazon

Dual-band Wireless-AC1900 Gigabit Router
At a glance
ProductASUS RT-AC68U Dual-band Wireless-AC1900 Gigabit Router   [Website]
SummarySecond gen+ Broadcom-based AC1900 router with USB 2.0 & 3.0 drive and printer sharing and PPTP VPN server.
Pros• Supports router, AP, media bridge and WDS bridging/repeating
Cons• Nothing glaring

Typical Price: $182  Check Amazon

Introduction

Some of the resident AC router fanboys over in the Forums are about to pop a blood vessel in anticipation of the first AC1900 class routers and trying to decide which to blow $200+ on. So I figured I'd better get something up sooner vs. later so that they have an alternative to the somewhat breathless reviews that other sites are posting. Rest assured that full reviews for NETGEAR's R7000 "Nighthawk" and ASUS' RT-AC68U will follow in the coming weeks.

As I explain in this short AC1900 primer, not many people will be able to experience the 600 Mbps link rates in 2.4 GHz that are the raison d'être for the AC1900 stew that Broadcom has cooked up. The only folks who will are those who spring for two routers and set the second up as a wireless bridge.

Even those who have the only AC1900 client device that exists—ASUS' PCE-AC68—will likely be disappointed. ASUS sent one along with the router and I was not able to get a link above 450 Mbps on the 2.4 GHz radio. So after wasting an afternoon trying to coax a 600 Mbps link, I fired off emails to ASUS and Broadcom to let them know of the problem and fell back to my trusty old PCE-AC66. Broadcom came back after a few days and confirmed that TurboQAM is not enabled by default in the PCE-AC68 driver. So ASUS is supposedly working on a new driver that will flip the proper bit.

NETGEAR R7000 & ASUS RT-AC68U

The gist of this is that this first look tests both products as AC1750 routers. If you're looking for AC1900 results, you'll have to wait for another week or so. Most people don't even have AC580 or AC867 class devices anyway and buy AC routers for the folly of future-proofing or in hope of improving wireless throughput and/or range for existing G and N devices.

The other question on your mind is likely to be "where's the Linksys EA6900"? Well, it seems that Linksys has a copy of the Octoscope MPE-based test setup I use and didn't like the results they were seeing when they checked the first batch of routers before sending them out for review. So they missed the window to be included in this review.

Inside

Because there has been a lot of speculation about the innards of these beasties, I opened both of them up after testing was done. Table 1 tells the tale.

NETGEAR R7000 ASUS RT-AC68U
CPU Broadcom BCM4709A Broadcom BCM4708A
Switch in BCM4709A In BCM4708A
RAM 256 MB 256 MB
Flash 128 MB 128 MB
2.4 GHz Radio - Broadcom BCM4360
- Skyworks SE2623L 2.4 GHz Power Amp (x3)
- Broadcom BCM4360
- Unidentified 2.4 GHz Power Amp marked 397 649e 230(x3)
5 GHz radio - Broadcom BCM4360
- Skyworks SE5003L1 5 GHz Power Amp (x3)
- Broadcom BCM4360
- SiGE 5023L 5 GHz Power Amp (x3)
Table 1: Component summary

The R7000 sports a Broadcom BCM4709A SoC, while the RT-AC68U uses the Broadcom BCM4708A. We've seen the second-generation BCM4708 in other second-round AC routers like the recently-reviewed ASUS RT-AC56U and Buffalo WZR-1750DHP.

Here's a look at the top of the R7000 board with its RF covers removed so you can see the two BCM4360 radios. The small devices to the left of the photo are the 2.4 and 5 GHz amplifiers that sit side-by-side to feed each antenna.

NETGEAR R7000 board top

NETGEAR R7000 board top

There are more internal photos in the gallery below. The last photo shows a very large heatsink that sits at the bottom of the router and that is directly thremally-coupled to the RF shielded compartment that houses the BCM4709 SoC, RAM and flash.

Here is a similar view of the ASUS board. It uses the same alternating arrangement for the outboard 2.4 and 5 GHz amplifiers. You can see one of the pads that thermally couple the amps to the RF compartment cover. All the devices have similar thermal coupling.

ASUS RT-AC68U board top

ASUS RT-AC68U board top

According to Broadcom, the main difference between the two processors is that the 4709 has a 1 GHz clock speed per core, vs. 4708's 800 MHz. The 4709 also supports faster DDR3-1600 memory and has "some other I/O" differences. So there is no overclocking involved, folks. NETGEAR simply chose a faster processor for the Nighthawk. Does NETGEAR (or ASUS for that matter) run the processors at full clock speed and do they enable access to all 256 MB? Who knows? All that matters in my book is performance, so let's get right to it.

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