ThinkPad T series

As successor of the 600 series, the T series became IBM mobile productivity line. Usually leading the ThinkPad range in technology, innovation and price, the T series was intended for the travelling businessman - comparatively more stylish, functional, and rugged machines; and easy to disassemble for repair or upgrades. T series ThinkPads are clad in black non-slip rubber with embedded glitter. The case lid has tabs along the edge that interlocks with depressions in the lower case when closed, to reduce case flexing.

ThinkPad T2x series

The ThinkPad T2x models (T20, T21, T22, T23) were Intel Mobile Pentium III-M based, sub-5 lb (2.3 kg) class machines. These machines typically had 14.1 inch XGA screens, S3 Savage graphics chips and Cirrus Logic sound chips. The T2x series introduced the UltraBay 2000 optical drive bay and titanium-reinforced screen lids. With the T23, an internal WiFi antenna became available, so WiFi miniPCI cards could be used. Also the T23 was the first ThinkPad featuring an UltraBay Plus drive and Embedded Security Subsystem.

ThinkPad T3x series

The T3x series only saw one model, the T30. Powered by a Intel Mobile Pentium 4-M and a Radeon 7500 graphics chip with 16 MB of discrete video memory, the T30 was available with 14.1 inch XGA or SXGA screens. The T30 introduced the UltraNav touchpad and integrated Bluetooth among ThinkPads. Other features include the Embedded Security Subsystem, Ultrabay Plus drive, integrated Wireless LAN. The shell is titanium reinforced composite. The whole package was a bit heavier and thicker than both the T2x and the T4x series.

ThinkPad T4x series

Includes the T40, T41, T42, T43, and associated "p" series (for "performance"; e.g., T43p). A typical T4x weighs 2.2 kg (4.9 lb), slightly less than the 600 series, and features an Intel Pentium M (Dothan) Processor, a 14.1 or 15 inch LCD (XGAor SXGA+), an integrated GPU (Intel Graphics Media Adapter 900) or a discrete GPU (Radeon 7500, 9000, Fire GL 9000, 9600, Fire GL T2, X300, and Fire GL V3200), and a hard drive ranging in size from 30 to 100 GB with the Active Protection System to protect the hard drive (T41 and later models). "p" (mobile workstation) models are also available with a 14" SXGA+ or a 15 inch UXGA FlexView display with wide viewing angle and high density IPS technology with resolutions up to 1600x1200. These 15 inch display models weigh slightly more than their lesser brethren, with optical drive and battery, at 2.7 kg (5.9 lb). Some T42 and T43 models feature a biometric security system with built-in fingerprint reader.

ThinkPad T6x series

Includes, as of 2006, the T60; intended as the next generation of the T4x Series Thinkpads; this is the first T Series Thinkpad to include the Intel Dual Core "Yonah" Technology and also Intels Core 2 Duo "Merom" CPUs. With T61 Lenovo drops 14" 4/3 in favor of 14" 16/10. Also T61's discrete GPU is now Nvidia (NVP 140M) instead of ATI one.