Looking at some of the improvements over Virtex-5, Virtex-6 FPGAs offer twice the capabilities with half the power by offering: dual-register 6-input LUT (look-up-table) logic structure; integrated PCI Express endpoint blocks; access rates of up to 800 Mbps using integrated memory controllers; low-power 600 MHz DSP48A1 slices with 18 x 18 multipliers; clock management tiles, each consisting of 2 MMCMs and 1 PLL; up to forty-eight low power 6.5 Gbps GTX, and up to twenty-four 11.18 Gbps GTH serial transceivers.