The Intel Xeon X5460 was a server/workstation processor with 4 cores, launched in November 2007. It is part of the Xeon lineup, using the Harpertown architecture with Socket 771. To further increase overall system performance, up to two Xeon X5460 CPUs can work together in a multi-processor (SMP) configuration. Xeon X5460 has 12 MB of L2 cache and operates at 3.16 GHz. Intel is building the Xeon X5460 on a 45 nm production process using 820 million transistors. The multiplier is locked on Xeon X5460, which limits its overclocking capabilities. With a TDP of 120 W, the Xeon X5460 consumes significant power, so adequate cooling is necessary. Intel's processor supports DDR2 memory with a dual-channel interface and a maximum frequency of 800 MHz. ECC memory is supported, too, which is an important capability for mission-critical systems, to avoid data corruption. Actual memory technology support depends on the chosen motherboard, because the memory controller is located on the motherboard (not in the processor). For communication with other components in the system, Xeon X5460 uses a PCI-Express N/A connection. This processor lacks integrated graphics, so a dedicated graphics card is required. Hardware virtualization is available on the Xeon X5460, which greatly improves virtual machine performance. The SSE4 instruction set is not supported, which may limit compatibility with some modern applications.