Best Settings For SBG6580 DOCSIS 3.0 Modem

Ok so i just recently upgraded to Road Runner Extreme which Uses DOCSIS 3.0 SBG6580 Modem and i was wondering what internal settings i should use to maximize my speeds and online gameplay. I'm running a Ethernet line into my Xbox360 and wireless for my laptop. Also, i was told that Road Runner Extreme would get me 35Mbps downstream and 5Mbps Upstream, yet these are the speed test's i'm getting

Any idea why i'm not getting the speeds i was promised?
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  1. I just got Time Warner (same parent company) Cable Extreme - 30mbps down, 5 up. I was also not getting the promised speeds using the wireless router.

    When connected through ethernet I was getting 31 down/5 up - but in order for all of my devices to work (ps3 and iphone are the only devices I have that don't understand 5Ghz frequency - therefore I had to use 2.4) I had to mess with internal router settings.

    Here's what I found out:

    Under Advanced-> Options make sure that UPnP is enabled - and when you connect your PS3 make sure to put a DHCP host name on your PS3 so that it can automatically open the ports it needs to.

    Under Firewall make sure that IP Flood Detection is turned off (first, put a secure password pleeeease)

    Under Wireless (here's where it took me 2 days of testing to figure it out) -
    For all devices to work I needed 2.4 Ghz band. N-mode set to Auto, and Bandwidth set to 40Mhz. Use to discover what channel other wifi's around you are using, and try to set your control channel as far away from everyone as possible.
    Next, click advanced under wireless - XPress technology should be enabled, Beacon Interval at 50, DTIM Interval at 1, Fragmentation Threshold at 2307, RTS Threshold at 2306, N Rate at 6Mbps, 802.11n Protection off (by choice), and Multicast rate of 1 Mbps.

    I know it seems like a lot of changes, but I did about 6 hours of testing with iPhone, PS3, Laptop, and hardwired desktop to make sure that these are the best settings for a 1200 sqft apt. I'm also no network expert, so if anyone has any better ideas, go for it.

    My speeds now are 27-29 d/l and 4.5-5 up over 2.4Ghz wireless N. Hardwired is always going to be better, but I can live with that speed on most of my devices.
  2. john_dillinger's response seemed to work for me perfectly. Thanks, by the way!
    If for some reason none of that works for you, I would recommend checking with your internet service provider. A lot of the time, it's the actual cable itself that can cause problems like this. They can check that for you, and hopefully replace and or repair it.
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