ASUS RT-AC51U splits network speed between 2.4 and 5 ghz. Any suggestions?

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blazs91

blazs91

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Hi, everybody!

I've just purchased an ASUS RT-AC51U router, since I upgraded my network speed to 200/100 Mb/s. However, I did not know that this pretty machine will create two networks working simultaneously. So now, I have one 2.4ghz and another 5ghz network.

My main issue is that the download bandwidth is halved between these networks: both operating on 100/100 Mb/s. I've turned off the 2.4ghz, but it did not solve the problem, and the other 5ghz network still had only 100/100 speed.

Could anyone help me, and tell me the secret of how can I use only the 5ghz (I do not need the other one, the 2.4ghz) with the original 200/100 Mb/s speed? Every single recommendation is warmly welcomed!

Thank you so much in advance!
 
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kanewolf
I should have seen this sooner --

You have a router that has only 100Mbit WAN port -- https://www.asus.com/Networking/RTAC51U/specifications/ Look at the "Ports" section. That means your link from the router to the modem is limited to 100Mbit. You need a different router to get anything faster.

The "750Mbit" that is advertised is just that -- ADVERTISING. Because the port to the router is 100Mbit it can't go any faster.
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blazs91

blazs91

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Sorry for my ignorance, but I do not have too much knowledge in this topic... What is an AC adapter?
 
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kanewolf

kanewolf

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There are different types of WIFI. The router you have has dual band 2.4Ghz and 5Ghz as you have already observed. It doesn't "split" your bandwidth between those two bands. But it is limited to 300Mbit (150Mbit throughput) rate on either of those bands UNLESS you have a WIFI device that supports the AC protocol -- https://en.wikipedia.org/wiki/IEEE_802.11ac

Either end of a WIFI link can be the limiting factor. From your description, I think your wireless device is the limiting factor. NOTHING that you do on your router can speed things up if your wireless card (or built-in WIFI) is the limiting device.

The surefire way to get the full bandwidth is to use a wired connection.
 
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blazs91

blazs91

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Dear kanewolf,

I have this device: ASUS ROG G750JZ https://www.asus.com/us/ROG-Republic-Of-Gamers/ROG-G750JZ/specifications/
According to the website, it does support the thing you mentioned, (Dual-band 802.11 ac or 802.11 a/b/g/n (WiDi)) and the router I have supports network speed up to 750 Mb/s. I know that 2.4Ghz can only provide 300 Mb/s, but the 5ghz should give me more than that. And since my internet was only 200/100Mb/s, even the 3ghz should get me all the speed. But both networks operating on 100/100, even if I plug the cable into my laptop and use wired connection...
 
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kanewolf

kanewolf

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I should have seen this sooner --

You have a router that has only 100Mbit WAN port -- https://www.asus.com/Networking/RTAC51U/specifications/ Look at the "Ports" section. That means your link from the router to the modem is limited to 100Mbit. You need a different router to get anything faster.

The "750Mbit" that is advertised is just that -- ADVERTISING. Because the port to the router is 100Mbit it can't go any faster.
 
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blazs91

blazs91

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Well, that's a pity! I've made a bad choice then when purchased this piece of plastic... :( Thank you, by the way, for your constructive comments! I really appreciate your effort to help me make it clear what the culprit was behind this incident!

 
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blazs91

blazs91

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Thanks for the advice! However, I'm currently thinking of getting this one: ASUS RT-N18U (https://www.asus.com/Networking/RTN18U/). It's a gigabit router, and has one RJ45 for 10/100/1000/Gigabits BaseT for WAN port. I presume, that it might be able to handle my 200/100 internet :)
 
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kanewolf

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That is a three stream WIFI but it is only a 2.4Ghz unit. You won't be able to take advantage of the 5Ghz radio in your laptop. I don't recommend a single band WIFI router these days. If you can find a deal on one, the RT-N66U is a great router.

From what I can find, the WIFI in your laptop is only a two stream (300Mbit) capable adapter. You will probably get about 150Mbit throughput on WIFI with the N18U (or any WIFI) To fully utilize 200Mbit download speeds you will have to use wired.
 
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blazs91

blazs91

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The RT-N66U is way out of my price-range. I'll use wired on my laptop. The wireless network is only needed for my phone.
 
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