Intel's Puma 6 chipset, used in gigabit broadband modems around the world, suffers from latency jitter so bad it ruins online gaming and other real-time connections.
Here are just a few devices with PUMA 6 chipsets which tend to be associated with gigabit cable modems. Not all of these are confirmed with a problem - it is just likely at this point.Arris SB6190Arris TG1672GArris TM1602Super Hub 3 (Arris TG2492LG) (commonly - virgin media)Hitron CGN3 / CDA / CGNV series modems:Hitron CDA-32372Hitron CDE-32372Hitron CDA3-35Hitron CGNV4Hitron CGNM-3552 (commonly - Rogers)Hitron CGN3 (eg CGN3-ACSMR)Hitron CGNM-2250 (commonly - Shaw)Linksys CM3024Linksys CM3016TP-Link CR7000Netgear AC1750 C6300 AC1900Netgear CM700Telstra Gateway Max (Netgear AC1900 / C6300) (Australia) Cisco DPC3848V Cisco DPC3941B / DPC3941T (commonly - Comcast Xfinity XB3)Cisco DPC3939Compal CH7465-LG / Arris TG2492LG (commonly - Virgin Media Hub 3)Samsung "Home Media Server"
https://www.theregister.co.uk/2016/12/03/intel_puma_chipset_firmware_fix/