HP t640 Thin Client The world's first self-defending thin client Highly secure and optimized for workplace productivity The HP t640 Thin Client helps keep your data safe across your workflows with built-in security and AMD Memory Guard. Choose the right fit for your specific users and environment with a range of subsystem options. Maximize what you can accomplish Empower your workforce with performance that conquers every task-an AMD Ryzen™ R1505G processor, high-speed, responsive system memory, and native support for up to three UHD/4K displays.