frequency of the microprocessor, up to a maximum of 150 MHz. It contained 17.6 million transistors, of which 6 million are for logic and 11.6 million are contained in the caches and TLBs. The die has an area of 210 mm2. It was fabricated by Fujitsu in their CS-70 process, a 0.24 μm, five-layer metal, CMOS process. It is packaged in a 957-pad flip-chip land grid array (LGA) package with dimensions of 42.5 mm by 42.5 mm. Of the 957 pads, 552 are for signals and 405 are for power and ground. Internal voltage is 2.5 V, I/O voltage is 3.3 V. Peak power consumption of 60 W at 275 MHz. The Ultra Port Architecture (UPA) signals are compatible with 3.3 V Low Voltage Transistor Transistor Logic (LVTTL) levels with the exception of differential clock signals which are compatible with 3.3 V pseudo emitter coupled logic (PECL) levels. Later versions The second and third SPARC64 GPs are fourth generation SPARC64 microprocessors. The second SPARC64 GP was a further development of the first and it operated at 400 to 563 MHz. The first versions, operating at 400 and 450 MHz were introduced on 1 August 2000. It had larger L1 instruction and data caches, doubled in capacity to 128 KB each; better branch prediction as the result of a larger BHT consisting of 16,384 entries; support for the Visual Instruction Set (VIS); and a L2 cache built from double data rate (DDR) SRAM. It contained 30 million transistors and was fabricated by Fujitsu in their CS80 process, a 0.18 μm CMOS process with six levels of copper interconnect. It used a 1.8 V internal power supply and a 2.5 or 3.3 V power supply for I/O. It was packaged in a 1,206-contact ball grid array (BGA) measuring 37.5 mm by 37.5 mm. of the 1,206 contacts, 552 are signals and 405 are power or ground. The third SPARC64 GP was identical to the second in terms of microarchitecture. It operated at 600 to 810 MHz. First versions were introduced in 2001. 700, 788 and 810 MHz versions introduced on 17 July 2002. It was fabricated by Fujitsu in their 0.15 μm CS85 process with six levels of copper interconnect. It used a 1.5 V internal power supply and a 1.8 or 2.5 V power supply for I/O. See also SPARC64 V (this article also covers the SPARC64 V+, VI, VII, VII+,