GHz and 5 GHz don’t refer to processing power in this context. Instead, they refer to the wireless network spectrum that Wi-Fi devices operate on.
2.4 GHz is the older standard and is what most routers and devices are still using. 2.4 GHz is somewhat slow and laggy when compared to 5 GHz, but it has a much greater range and compatibility.
5 GHz is the newer standard and is mainly used by newer devices. It’s much faster and has lower latency than 2.4 GHz, but has a much shorter range. You may also experience compatibility issues with older devices that are only made to connect to 2.4 GHz. To get around this, most routers and Wi-Fi antennas support both standards.
Even if all devices involved support both standards, use 5 GHz where possible. This is especially important for gamers since the lower latency of the 5 GHz standard will ensure less lag when playing online. 2.4 GHz generally isn’t suitable for gaming purposes but can suffice for web browsing and media consumption.
Important to note: no Wi-Fi connection will ever beat a hardwired ethernet connection when it comes to stability, latency, and overall performance. If you’re doing professional work or pro gaming, we recommend an ethernet cable whenever possible.