The third notch on the spectrum, the Pentium 4 651 features a 3.4GHz clock speed with 2MB of L2 Cache. None of the four CPUs have Virtualization Technology support, although they all boast lower heat outputs (651 - TDP: 65W). Additional features of the Intel Pentium 4 651 ‘Cedar Mill’ Pentium 4 processor include Intel Hyper-Threading Technology, Intel 64, Enhanced Halt State (C1E), Enhanced Intel Speedstep Technology, and Execute Disable Bit. The Intel Pentium 4 651 retails for approximately $75.00 and comes with a 3 year limited warranty.