The 2.5 port is linked to my PC, while the other is linked...

https://litecomparison.com/motorola-mb8611-vs-arris-s33/

DOCSIS 3.1 Cable Modems support cable internet rates of up to 1.2 Gbps (32 downstream x 8 upstream). 2 upstream x 2 downstream OFDM Bonded DOCSIS 3.0 channels DOCSIS 3 1 channels Connects to any existing Wi-Fi network for lightning-fast internet. Gaming, conferencing, and high-speed streaming are all options. Active Queue Management reduces Internet latency and increases app performance in areas such as online gaming, conferencing, and streaming (AQM). Significant cost reductions – Having your own modem saves your home an average of $168 in rental expenses each year. (Savings based on Comcast Xfinity; savings may vary depending on service provider.) Motorola is a world leader in technology that people can rely on. It comes with a two-year warranty and free technical support from our experts in the United States of America. Compatible with major cable Internet providers in the United States, including as Cox, Spectrum, and Xfinity. ice. Stop renting your modem and save money on modem rentals! DOCSIS (DOCSIS 3.0) is a high-speed Internet protocol that provides true Gigabit-plus speeds. High-speed internet is available via Comcast Xfinity, Cox, and Spectrum. 32×8 Backward compatibility with DOCSIS 3.0 This gadget may be paired with any WiFi router. It works with any WiFi router to connect all of your devices. This cable modem has no built-in wireless router or phone capability. Ethernet multi-gigabit speed — When your internet service provider enables it, a 2.5 GB Ethernet connection may give really high-speed connectivity to even the most powerful routers and PCs, with downstream rates of just under 2,500 Mbps and upstream speeds of up to 800 Mbps.

I bought one from BestBuy, and YES, you can use both ports at the same time. The 2.5 port is linked to my PC, while the other is linked to my Asus Ax11000 router. I hope you find this material beneficial. I have three things to say to you. 1. The 7621 has 24 × 8 channels, whereas the 7420 has 16 x 4 channels. More channels mean more data flow. 2. The 7621 is capable of 1000 Mbps, whilst the 7420 is only capable of 643 Mbps. This is a wonderful choice if you need to boost your internet speed in the future. The Arris S33 is a 32 × 8 DOCIS 3.1 device with speeds of up to 2.5 Gb. While the modem is on the Xfinity acceptable equipment list (for more information, visit dslreports.com), it is your router that is important. Check that your router can handle speeds of at least 1 gigabit per second. 3. The 7621 was introduced in December 2017, whereas the 7420 was released in 2015, with improved technology and longer support from the manufacturer. The MB8600 only supports one device. The MB8600 may be used to link your PC or a router. You can connect up to four devices directly to the MB8600 if you pay for and receive several IP addresses from your provider. Motorola MB8611 vs Arris S33