F5F Stay Refreshed Power Users Networks Your modem is moving too slow when you use it.

Your modem is moving too slow when you use it.

Your modem is moving too slow when you use it.

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crafty70
Member
90
06-15-2026, 01:51 AM
#1
Hi there! I'm new around here and I need your help with something. My Motorola Arris Surfboard SHG6782 modem just got a new offer from my cable company: it's changed from 200mb to 400mb. When I run speed tests, the numbers never go higher than 260mb even after they confirmed everything looks good in person and said nothing is wrong with the setup. They say I should change out the modem, but since this one came from my house and not theirs, I want to be sure it's broken before buying a replacement. Is there any specific test or computer check that can show if my modem actually has problems? Thanks!
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crafty70
06-15-2026, 01:51 AM #1

Hi there! I'm new around here and I need your help with something. My Motorola Arris Surfboard SHG6782 modem just got a new offer from my cable company: it's changed from 200mb to 400mb. When I run speed tests, the numbers never go higher than 260mb even after they confirmed everything looks good in person and said nothing is wrong with the setup. They say I should change out the modem, but since this one came from my house and not theirs, I want to be sure it's broken before buying a replacement. Is there any specific test or computer check that can show if my modem actually has problems? Thanks!

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Im_That_Guy
Junior Member
19
06-15-2026, 03:48 AM
#2
You need to check your ISP's website to see if their modem is on the list of approved ones for 400Mbit speeds. Make sure yours is there before you try anything else.
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Im_That_Guy
06-15-2026, 03:48 AM #2

You need to check your ISP's website to see if their modem is on the list of approved ones for 400Mbit speeds. Make sure yours is there before you try anything else.

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Mike_10
Junior Member
14
06-15-2026, 05:34 AM
#3
It's one single device that acts as both modem and router. Did you try plugging an ethernet cable in, or just use the wifi? At 260 mbps with just wifi on that specific box, it wouldn't be surprising to see a high speed limit.
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Mike_10
06-15-2026, 05:34 AM #3

It's one single device that acts as both modem and router. Did you try plugging an ethernet cable in, or just use the wifi? At 260 mbps with just wifi on that specific box, it wouldn't be surprising to see a high speed limit.

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II_RIPTIDE_II
Member
167
06-15-2026, 11:28 AM
#4
I called hoping to find the thing I needed, but someone said no because they give out their own modems. I was just wondering if there were other options available. Thanks for listening!
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II_RIPTIDE_II
06-15-2026, 11:28 AM #4

I called hoping to find the thing I needed, but someone said no because they give out their own modems. I was just wondering if there were other options available. Thanks for listening!

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niel4553
Junior Member
6
06-15-2026, 05:07 PM
#5
I am trying to test using an ethernet cable
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niel4553
06-15-2026, 05:07 PM #5

I am trying to test using an ethernet cable

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lukefielding
Junior Member
35
06-15-2026, 08:42 PM
#6
That feels pretty weird because it doesn't work. The Aris line has most ISPs, and they usually give that when they hand out a modem. Try asking what model number of the device they sell you. You have a docsis 3.0, which should easily handle gigabit speeds, but maybe your ISP is using docsis 3.1 for faster plans. Usually, if you want gigabit service, they use the 3.1 speed. Do they charge extra for their modem? I know cable companies in my area just added a monthly fee into the base plan now. You pay the same amount whether you use their equipment or yours.
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lukefielding
06-15-2026, 08:42 PM #6

That feels pretty weird because it doesn't work. The Aris line has most ISPs, and they usually give that when they hand out a modem. Try asking what model number of the device they sell you. You have a docsis 3.0, which should easily handle gigabit speeds, but maybe your ISP is using docsis 3.1 for faster plans. Usually, if you want gigabit service, they use the 3.1 speed. Do they charge extra for their modem? I know cable companies in my area just added a monthly fee into the base plan now. You pay the same amount whether you use their equipment or yours.

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BoyGamerBG
Junior Member
5
06-22-2026, 08:23 PM
#7
I'll ask about whether they charge extra for renting the modem or if that comes free. How do I figure out my download speed on the modem?
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BoyGamerBG
06-22-2026, 08:23 PM #7

I'll ask about whether they charge extra for renting the modem or if that comes free. How do I figure out my download speed on the modem?

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1234qaz12qaz
Posting Freak
773
06-22-2026, 09:12 PM
#8
Do you have a reliable modem I could suggest to help with this update?
1
1234qaz12qaz
06-22-2026, 09:12 PM #8

Do you have a reliable modem I could suggest to help with this update?

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The_KKay
Junior Member
6
06-24-2026, 05:11 PM
#9
The speed of your download depends on the Internet Service Provider's (ISP) setup, not just the modem you bought. If you have a current unit, it might actually reach 1 gigabit if their network is set up right to let that happen. But there are big problems because they need perfect conditions everywhere. Most ISPs use older tech like docsis 3.1 for speeds as high as 1gbit because newer stuff can handle even higher speeds, sometimes up to 10gbit. It just seems odd how they would have no trouble offering 500mbps plans using the old tech. All this is just a guess based on what modems are recommended for your plan. This feels strange since they usually don't give you a list of compatible devices. Some brands like Huewai will work fine, but almost all ISPs in the USA won't let them activate. Even if you own the modem, they must keep their firmware updated, which can stop support from big companies like Arris. I've seen many ISPs refuse to turn on Arris devices that have WiFi6 just because it came out recently.
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The_KKay
06-24-2026, 05:11 PM #9

The speed of your download depends on the Internet Service Provider's (ISP) setup, not just the modem you bought. If you have a current unit, it might actually reach 1 gigabit if their network is set up right to let that happen. But there are big problems because they need perfect conditions everywhere. Most ISPs use older tech like docsis 3.1 for speeds as high as 1gbit because newer stuff can handle even higher speeds, sometimes up to 10gbit. It just seems odd how they would have no trouble offering 500mbps plans using the old tech. All this is just a guess based on what modems are recommended for your plan. This feels strange since they usually don't give you a list of compatible devices. Some brands like Huewai will work fine, but almost all ISPs in the USA won't let them activate. Even if you own the modem, they must keep their firmware updated, which can stop support from big companies like Arris. I've seen many ISPs refuse to turn on Arris devices that have WiFi6 just because it came out recently.

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Jerryx01
Posting Freak
870
06-24-2026, 10:23 PM
#10
I looked at the web and found this. I believe it has a speed limit on my motorola arris surfboard shg6782. The download speeds are up to 343 Mbps. It is a DOCSIS 3.0 Cable Modem with 8 channels for both downloading and uploading. It uses IPv4 and IPv6, which is the newest way to connect to the internet. This modem works with all U.S. cable providers.
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Jerryx01
06-24-2026, 10:23 PM #10

I looked at the web and found this. I believe it has a speed limit on my motorola arris surfboard shg6782. The download speeds are up to 343 Mbps. It is a DOCSIS 3.0 Cable Modem with 8 channels for both downloading and uploading. It uses IPv4 and IPv6, which is the newest way to connect to the internet. This modem works with all U.S. cable providers.

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