104 Modems to Avoid: The Ultimate PDF List of Unreliable Modems[2024 Updated]

If you are experiencing issues with your internet connectivity like frequent disconnects, lag spikes or slow speeds that are intermittent, the underlying issue could very well be the chipset in your cable modem. Specifically, modems using Intel’s Puma 6 or Puma 7 chipsets have been known to cause performance and stability problems.

In this comprehensive guide, we will cover everything you need to know about the problematic Puma chipsets, which cable modems are affected, the defects explained, how to identify them, the legal implications, and your options going forward.

Complete List of Unreliable Modems to Avoid Purchasing or Renting

Here is a frequently updated list of cable modems documented or confirmed to be using Intel’s Puma 6 or Puma 7 chipsets.

Avoid purchasing or renting the models below:

List of Bad Modems with Intel Puma 6 and Puma 7 Chipsets - Arranged Company Wise

wdt_ID List of Bad Modems with Intel Puma 6 and Puma 7 Chipsets - Arranged Company Wise
1 Arris:
2 Arris G36
3 ARRIS CM3200
4 ARRIS DG1642
5 ARRIS DG1660
6 ARRIS DG1662
7 ARRIS DG1670
8 ARRIS DG2460
9 ARRIS DG2470
10 ARRIS DG3260
11 ARRIS DG3270
12 ARRIS DG3450
15 ARRIS SB6190
20 ARRIS SBG8300
21 ARRIS SBV2402
22 ARRIS SBV3202
24 ARRIS T25
25 ARRIS TG1642
26 ARRIS TG1652
27 ARRIS TG1662
28 ARRIS TG1672
29 ARRIS TG1682
30 ARRIS TG2472 (TG2472G)
31 ARRIS TG2482
32 ARRIS TG2492
33 ARRIS TG3452
34 ARRIS TG3462
35 ARRIS TM1602
36 ARRIS TM3402
37 ASUS:
38 ASUS CM-32
39 Cisco:
40 Cisco DPC3848
41 Cisco DPC3848V
42 Cisco DPC3941B / DPC3941T  (commonly, Comcast Xfinity XB3)
43 Cisco DPC3939
44 Compal Broadband Networks:
45 Compal Broadband Networks CH7466
46 FRITZ!Box:
47 FRITZ!Box 6430
48 FRITZ!Box 6460
49 FRITZ!Box 6490
50 FRITZ!Box 6590
51 Hitron:
52 Hitron CDA-32372
53 Hitron CDE-32372
54 Hitron CDA3
55 Hitron CDA3-20
56 Hitron CDA3-35
57 Hitron CGN3
58 Hitron CGN3ACR
59 Hitron CGN3ACSMR
60 Hitron CGN3AMF
61 Hitron CGN3AMR
62 Hitron CGN3M35
63 Hitron CGNM-2250
64 Hitron (CGNM) CGNM-2252
65 Hitron CGNM-3550
66 Hitron CGNM-3552
67 Hitron CGNV4
68 Hitron CGNVM-2559
69 Hitron CGNVM-3580
70 Hitron CGNVM-3582
71 Hitron CGNVM-3589
72 Hitron CHITA
73 Hitron CODA-45
74 Hitron CODA-4502
75 Hitron CODA-4580
76 Hitron CODA-4582
77 Hitron CODA-4589
78 Hitron CODA-46
79 Hitron CODA-4602
80 Hitron CODA-4680
81 Hitron CODA-4682
82 Hitron CODA-4689
83 Hitron CODA-47
84 Hitron CODA-4702
85 Hitron CODA-4780
86 Hitron CODA-4782
87 Hitron CODA-4789
88 Hitron CODA-5519
89 Hitron E31N2V1
90 Hitron EN2251
91 Linksys:
92 Linksys CG6350
93 Linksys CG7500
94 Linksys CM3016
95 Linksys CM3024
97 NETGEAR C6300
98 NETGEAR C6300-100NAS
99 NETGEAR C6300v2
105 NETGEAR CG4500
108 Samsung:
109 Samsung Home Media Server
110 SMC:
111 SMC D3G2408
112 Technicolor:
113 Technicolor TC4350
114 TP-Link:
115 TP-Link CR7000
116 Virgin Media:
117 Virgin Media Super Hub 3 (ARRIS TG2492LG-VM or ARRIS TG2492S/CE or VMDG505 or Compal Broadband Networks CH7465)
118 Virgin Media Super Hub 4 (ARRIS TG3492LG-VMB)
120 XFINITY XB3 (ARRIS TG1682G, Cisco DPC3939, Cisco DPC3941B, Cisco DPC3941T)
122 XFINITY XB7 (ARRIS TG4482 or CommScope TG4482)
List of Bad Modems with Intel Puma 6 and Puma 7 Chipsets - Arranged Company Wise

What is the Intel Puma Chipset Defect?

Intel Puma chipsets are built into the modems offered by many popular brands like Arris, Netgear, Linksys and others. However, these chipsets have a serious hardware flaw that manifests itself by causing the following connectivity problems:

  • Frequent disconnects and modem reboots
  • High spikes in latency leading to lag
  • Severe network jitter (variable latency)
  • Slow page loads and buffering issues
  • Packet loss and connectivity drops during gaming or video calls
  • Modems keep resetting

The main culprit is that the chipset has an inefficient processor that struggles to handle network traffic properly. Essentially, it fails to prioritize time-sensitive network packets quick enough before a maintenance routine hogs up resources causing delays and congestion.

This results in highly variable speeds and ping times, making activities like online gaming, video streaming and even web browsing a frustrating experience.

Initially discovered by gamers complaining of lag spikes, the Puma 6 defect gained widespread attention in 2016 leading to a class action lawsuit against Intel and modem vendors using the faulty hardware.

Why are Puma 6 and Puma 7 Modems Still Being Sold?

Despite awareness of the issue, many cable ISPs continue supplying customers with defective modems containing Puma 6 or Puma 7 chipsets. Partly because Intel has released patches that mitigate some problems, but don’t eliminate them entirely.

For vendors, replacing inventory is expensive. And some cable providers rent modems to subscribers, profiting from periodic fees. There is little incentive for them to swap out devices until faults are very noticeable.

So should you avoid Puma 6 and 7 modems? While not everyone encounters severe problems, the risk remains. And there are affordable, reliable alternatives without these chipsets.

How to Identify an Intel Puma Modem?

Here are some tips for identifying modems with Intel’s Puma chipsets:

  • Chipset branding – Modems will usually have “Puma 6” or “Puma 7” branded on the packaging or device.
  • Intel logo – Some modems feature Intel’s logo on the front or back. If visible, it likely has a Puma chipset inside.
  • Model numbers – Refer to the list below of affected modem models by major brands.

How to Check if Your Modem Uses Intel Puma

If you can’t identify the chipset from model numbers, packaging or manuals, here are some ways to check:

  • Command prompt – Access your modem administration console and check what hardware is listed under the model name
  • Contact ISP – Your Internet provider can look up the model and confirm the chipset
  • Chat support – Initiate a chat session with the modem manufacturer and ask what chipset it uses

The widespread issues spawned several class action lawsuits led by the law firm Schubert Jonckheer & Kolbe LLP. Arris, the modem vendor most heavily targeted, agreed to settlements offering partial refunds or discounts on new devices.

While plaintiffs still seek further litigation, it signals that companies selling products with known defects can face legal repercussions. For affected customers, registering your experience creates documentation that may assist future consumer action to claim compensation.

Should You Keep Using a Puma Modem?

Intel Puma modems don’t impact every customer. Light internet users may never notice connectivity problems or write them off as regular ISP issues. But the risk remains for instability which can hamper work productivity or leisure online.

For equipment owners, replacing your modem is recommended. Renters can request a swap from their provider. Opt for a reliable modem with a Broadcom, Qualcomm or Cavium chipset instead.

If upgrading isn’t viable, try these troubleshooting steps:

  • Ask ISP to disable OFDMA upstream channels which seem error prone
  • Enable bridge mode to bypass the modem’s router
  • Use wired connections instead of WiFi where possible

Avoiding latency and stability issues should be the priority. The Puma defect is hardware-based, so software updates only provide partial fixes.

Top 3 Puma-Free Modem Recommendations

Here are some excellent and affordable Puma-free alternatives to consider for a fast and reliable connection:

1. Motorola 8600

The Motorola 8600 tops the charts with its Broadcom chipset that alleviates the Puma problems. It works on cable plans up to 1000 Mbps and is capable to handle upto 6 Gbps speed.

2. Netgear CM2000

Another reasonably priced modem praised for stability is the Netgear CM2000 with its Broadcom chipset. Supports plans up to 1000 Mbps.

3. ARRIS Surfboard SB8200

If you want an Arris modem without Puma, check out the ARRIS Surfboard SB8200 and its reliable Broadcom chipset. Handles plans up to 1000 Mbps.


In closing, all internet subscribers deserve a modem free of hardware flaws that hamper connectivity. Avoid using or renting devices with Intel’s Puma 6 or Puma 7 chipsets that come with instability risks.

Check your equipment against model numbers listed and consider better alternatives recommended if you face frequent lag, packet loss or slow speeds. Let’s hope that one day cable providers only offer modems vetted to deliver consistently smooth performance.

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