ThinkPad R40 features. Processor: Powerful Intel Pentium M processor at 1.4 GHz with enhanced Intel SpeedStep technology and 1.0 MB of on-board L2 cache. Memory: Standard system memory of 128 MB of PC 266 MHz, DDR non-parity memory, expandable to a maximum of 2.0 GB with 128, 256, or 512 MB or 1.0 GB SO DIMMs.