The VIA Nano X2 U4025 was a mobile processor with 2 cores, launched in January 2011. It is part of the Nano X2 lineup, using the Isaiah (CNC) architecture with VIA nanoBGA2. Nano X2 U4025 has 1 MB of L2 cache per core and operates at 1200 MHz. VIA is making the Nano X2 U4025 on a 40 nm production node using 188 million transistors. The silicon die of the chip is not fabricated at VIA, but at the foundry of TSMC. The multiplier is locked on Nano X2 U4025, which limits its overclocking potential.
With a TDP of 13 W, the Nano X2 U4025 consumes very little energy. VIA's processor supports DDR2 and DDR3 memory with a single-channel interface. The highest officially supported memory speed is 1066 MT/s, but with overclocking (and the right memory modules) you can go even higher. Actual memory technology support depends on the chosen motherboard, because the memory controller is located on the motherboard (not in the processor).
Hardware virtualization is available on the Nano X2 U4025, which greatly improves virtual machine performance.