If you have ever joined a TeamSpeak channel with 50+ people (like a Battlefield squadron or an Arma 3 operation), you know the CPU strain. The 64-bit client utilizes the x86-64 instruction set, allowing for faster register handling and more efficient processing of multiple Opus audio codec streams simultaneously.
With the sunset of 32-bit operating systems and increasing memory demands (e.g., high-res overlay add-ons, sound packs with thousands of samples), the 64-bit TeamSpeak 3 client is the for new installations. The upcoming TeamSpeak 5 (under beta) will be exclusively 64-bit, so migrating now ensures a smooth transition. teamspeak 3 client 64 bit