![]() The 750CX was only used in one iMac and iBook revision. It had a die size of 43 mm 2 through a 0.18 μm copper process. The 750CX had 20 million transistors including its L2 cache. It has a 256 KiB on-die L2 cache this increased performance while reducing power consumption and complexity. IBM continued to develop the PowerPC 750 line and introduced the PowerPC 750CX (code-named Sidewinder) in 2000. After this model, Motorola chose not to keep developing the 750 processors in favour of their PowerPC 7400 processor and other cores. ![]() Motorola revised the 740/750 design in 1998 and shrunk die size to 51 mm 2 thanks to a newer aluminium based fabrication at 0.22 μm. The RAD750 packaging and logic functions has a price tag in excess of US$200,000 : the high price is mainly due to radiation hardening revisions to the PowerPC 750 architecture and manufacturing, stringent quality control requirements, and extended testing of each processor chip manufactured. The CPU itself can withstand 200,000 to 1,000,000 Rads and temperature ranges between −55 and 125 ☌. The processor has 10.4 million transistors, is manufactured by BAE Systems using either 250 or 150 nm process and has a die area of 130 mm². The Mars Science Laboratory ( Curiosity), Mars Reconnaissance Orbiter, and Mars 2020 ( Perseverance) spacecraft have a RAD750 on board. The RAD750 was released for purchase in 2001. It is intended for use in high radiation environments such as experienced on board satellites and other spacecraft. The RAD750 is a radiation-hardened processor, based on the PowerPC 750. The PowerPC 750 was used in many computers from Apple, including the original iMac. The 750 with its L2 cache bus required more pins and thus a different package, a 360-pin ball grid array (BGA). The PowerPC 740 is completely pin compatible with the older 603, allowing upgrades to the PowerBook 1400, 2400, and even a prototype PowerBook 500/G3. The design was so successful that it quickly surpassed the PowerPC 604e in integer performance, causing a planned 604 successor to be scrapped. The off-die L2 cache of the 750 increased performance by approximately 30% in most situations. The 740 slightly outperformed the Pentium II while consuming far less power and with a smaller die. In 1999, IBM fabricated versions in a 0.20 μm process with copper interconnects, which increased the frequency up to 500 MHz and decreased power consumption to 6 W and the die size to 40 mm 2. The die measured 67 mm 2 at 0.26 μm and it reached speeds of up to 366 MHz while consuming 7.3 W. The 740/750 models had 6.35 million transistors and were initially manufactured by IBM and Motorola in an aluminium based fabrication process. The BTIC caches the first two instructions at a branch target. Dynamic branch prediction uses the recorded outcome of a branch stored in a 512-entry by 2-bit branch history table (BHT) to predict its outcome. The 740 and 750 added dynamic branch prediction and a 64-entry branch target instruction cache (BTIC). The cache was accessed via a dedicated 64-bit bus. The cache controller and cache tags are on-die. The 750 had support for an optional 256, 512 or 1024 KB external unified L2 cache. Enhancements included a faster 60x system bus (66 MHz), larger L1 caches (32 KB instruction and 32 KB data), a second integer unit, an enhanced floating point unit, and higher core frequency. The PowerPC 740 and 750 (codename Arthur) were introduced in late 1997 as an evolutionary replacement for the PowerPC 603e. Processors PowerPC 740/750 300 MHz Motorola PowerPC 750 processor with off-die L2 cache on the CPU module from a Power Mac G3. Motorola's 74xx range of processors picked up where the 7xx left off. The 7xx family had its shortcomings, namely lack of SMP support and SIMD capabilities and a relatively weak FPU. The 7xx family is also widely used in embedded devices like printers, routers, storage devices, spacecraft, and video game consoles. The low power requirements and small size made the processors ideal for laptops and the name lived out its last days at Apple in the iBook. Such designations were applied to Mac computers such as the PowerBook G3, the multicolored iMacs, iBooks and several desktops, including both the Beige and Blue and White Power Macintosh G3s. The term "PowerPC G3" is often, and incorrectly, imagined to be a microprocessor when in fact a number of microprocessors from different vendors have been used. ![]() This family is called the PowerPC G3 by Apple Computer (later Apple Inc.), which introduced it on November 10, 1997. The PowerPC 7xx is a family of third generation 32-bit PowerPC microprocessors designed and manufactured by IBM and Motorola (spun off as Freescale Semiconductor bought by NXP Semiconductors). ![]()
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