Cox → [AZ] Speed after DOCSIS 3.0 upgrade

I'm on Cox Preferred service, last week upgraded to a Cisco DPC3010 DOCSIS 3.0 modem (refurbished). Online modem registration/activation went fine and it's been online for 7 days. I saw an immediate increase in upload speed, now around 15-25 mbps. But download speed increased only slightly, from about 28 mbps on the prior Motorola 5120 modem to a very consistent at ~32 mbps with the new modem on both Cox and Speedtest.net tests. So not much of an increase and nowhere near the 50 mbps Preferred service implemented in July (I believe). Modem firmware d3000-v302r125533-120716a-COX.bin Jul 16 17:16:46 2012. Account Details page displays Hardware: RSA3010. I go to the "modem upgrade" link from the Cox speed test, enter my account info, and the page replies "To get the fastest speed offered with your package, you need to upgrade your modem." So, where do I logically go from here - does that last result mean my Cox account settings don't yet recognize the D3 modem and a setting needs to be updated? Or should I pursue the traditional speed troubleshooting from the sticky? Or maybe it's a lemon of a refurbished modem? Thanks for guidance.

Upgrading the modem doesn't automatically switch your account to DOCSIS 3.0 service so we may still need to look at that. PM me the modem MAC and I'll take a look.

CoxTech1 - thank you for your help, the improvement was noticeable, great speed now.

Good afternoon,

Just wanted to bump this, because I am currently having the same issue.
I recently upgraded from a DOCSIS 2.0 modem by purchasing a Motorola SB6121 (DOCSIS 3.0). I successfully did the self installation through cox.com. However whenever I do a speed test, it only went from ~25mbps to ~32mbps. My current plan is the Preferred service.

Was wondering if the upgrades have not rolled out in my area yet (Avondale) or Cox yet to recognize my new modem.

It would be much appreciated if I could get the same assistance as garyk1.

Thank you.

Avondale has the speed upgrade, you just have the old D2 service code on your account which needs to be changed, PM your MAC id to CoxTech1.

>> d3000-v302r125533-120716a-COX.bin

interesting, I just installed a dpc3010 myself and have

dpc3010-v302r12901-110516a-COX.bin

and dang this modem runs hot compared to my 2.0 (which wasn't exactly cool itself)

I swear I am seeing more latency too (ping time, time-to-first-connect, etc)

Kitykat - since my modem had been online for 7 days, it could be that during that time Cox installed the firmware version I posted. This modem might be a little warmer at one end than the old one, but I have it standing upright with free space all around and don't notice that it's overall hot. I've been consistently getting the promised speeds or better, with very low ping times. However, it does take a lot longer to connect after reboot than the DOCSIS 2.0 version did.