New CM600 modem consistently gets slower speeds than Xfinity modem (on singlethreaded speed tests)

[dsuse]

Hi, I recently bought the CM600 cable modem hoping to cut out the modem rental that Comcast provides.  I had their Xfinity Technicolor TC8305c modem previously.  I have Blast! internet service that provides a max speed of 150mbps.  After testing both modems, the new Netgear modem doesn't seem to keep up on singe threaded speed tests such as the one at http://speedof.me

Here are the details (average speeds):

Xfinity Modem

speedtest.net (multi) - 180 mbps

speedof.me (single)  - 120-130 mbps

Netgear CM600

speedtest.net (multi) - 160 mbps

speedof.me (single)  - 90 mbps

I've also ran several other tests where the netgear doesn't quite keep up.

The modem is updated to the latest firmware (V1.01.09) and seems to work well otherwise.  I'm trying to decide if I should ignore this discrepancy or if there is an actual issue here.  It's really bothering me though, so hopefully someone has some insight into what could be going on.

Thanks for any help someone can offer!

Below is the cable connection data from the modem:

Frequency start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 621000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv6 only

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 4 621000000 Hz -0.8 dBmV 39.3 dB 0 0 2 Locked QAM256 1 603000000 Hz -0.1 dBmV 39.6 dB 0 0 3 Locked QAM256 2 609000000 Hz -1.5 dBmV 39.0 dB 0 0 4 Locked QAM256 3 615000000 Hz -2.5 dBmV 38.5 dB 0 0 5 Locked QAM256 5 627000000 Hz -2.7 dBmV 38.4 dB 0 0 6 Locked QAM256 6 633000000 Hz -3.9 dBmV 37.9 dB 0 0 7 Locked QAM256 7 639000000 Hz -2.7 dBmV 38.4 dB 0 0 8 Locked QAM256 8 645000000 Hz -3.3 dBmV 38.0 dB 0 0 9 Locked QAM256 9 651000000 Hz -3.7 dBmV 37.6 dB 0 0 10 Locked QAM256 10 657000000 Hz -2.6 dBmV 38.0 dB 0 0 11 Locked QAM256 11 663000000 Hz -2.8 dBmV 37.7 dB 0 0 12 Locked QAM256 12 669000000 Hz -2.9 dBmV 37.7 dB 0 0 13 Locked QAM256 13 675000000 Hz -1.9 dBmV 37.1 dB 0 0 14 Locked QAM256 14 681000000 Hz -1.6 dBmV 38.8 dB 0 0 15 Locked QAM256 15 687000000 Hz -1.7 dBmV 38.7 dB 1 0 16 Locked QAM256 16 693000000 Hz -2.8 dBmV 38.0 dB 0 0 17 Locked QAM256 17 699000000 Hz -3.8 dBmV 37.2 dB 0 0 18 Locked QAM256 18 705000000 Hz -4.6 dBmV 36.5 dB 0 0 19 Locked QAM256 19 711000000 Hz -7.2 dBmV 34.2 dB 0 0 20 Locked QAM256 20 717000000 Hz -8.2 dBmV 33.3 dB 0 0 21 Locked QAM256 21 723000000 Hz -7.8 dBmV 33.4 dB 0 0 22 Locked QAM256 22 729000000 Hz -10.0 dBmV 31.9 dB 0 0 23 Locked QAM256 23 735000000 Hz -8.3 dBmV 33.2 dB 0 0 24 Locked QAM256 24 741000000 Hz -6.3 dBmV 35.2 dB 0 0

[DarrenM]

Hello dsuse

Do you happen to have some kind of cable spliter if so try removing it. Sometimes it can cause issues on some modem and other can work just fine with it.

DarrenM