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Netgear Cable Modem Slow Download Speed

NETGEAR CM500-1AZNAS (16x4) DOCSIS 3.0 Cable Modem only provides 38Mbps vs. cable modem's 150Mbps. Specs for the Netgear say up to 620Mbps.  The upload speed is 5.7 which equals the cable modem.  There are no adjustments in the modem.
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John
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It has lower throughput than your cable modem and so since there are no adjustments, all you can do is upgrade the firmware and test and if that does not help then get a faster box
Talk to your internet provider. Does your ISP allow you to use your own equipment rather than what it supplies? Most don’t, so it’s possible that you’re fortunate to have a connection at all.
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perarduaadastra:

Comcast supports it. It activates through their portal.
Try updating the firmware to see if that helps.
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John:

It is rated for much higher download speeds and it gets the correct upload speed.  I left it connected but, the firmware didn't upgrade.
You need to go to the section in the Netgear router (maintenance probably), look for firmware and manually update it.

It may not reach rated speed in your environment.  After updating firmware, you will know.
The specs say:
"CableLabs® DOCSIS® 3.0 certified to work with U.S. cable Internet providers like XFINITY® from Comcast, Spectrum, Cox, Cablevision & more (not compatible with Cable bundled voice services)"

Do you have VOIP?
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John:

I have a router.  There is no way to update the firmware on the device. Netgear says the ISP will update it but, comcast won't update a 3rd party box.  Basically, it just doesn't perform as advertised.  

I was speculating, however, that it is in the cable company's best interest to "accidentally" throttle 3rd part devices. <g>
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Thanks for the help
Thanks for the update. I guess the ISP’s are trying to promote their own devices