Power management came with Intelligent Power Capability, and this was per core power consumption monitoring and optimization. Xeons migrated to the Intel Core microarchitecture on the 14th of March in 2006 with the Xeon Low Voltage (LV). Dual core parts now had a cache of 6MB and quad core parts 12MB. From the Xeon lineup built of 410 million transistors for dual core parts, and 820 million transistors for quad core parts were the E5000 series and the X5000 series. Dual core parts had 6MB of L2 and quad core parts 12MB.