Editing PowerPC 970 (section)

===PowerPC 970FX===
The '''PowerPC 970FX''' has a [[90 nanometer|90&nbsp;nm]] manufacturing process and has a maximum power rating of 11 watts at 149 degrees Fahrenheit (65&nbsp;°C) while clocked at 1&nbsp;GHz and a maximum of 48 watts at 2&nbsp;GHz.<ref>{{cite web|url=https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/1DE505664D202D2987256D9C006B90A5/$file/PPC970FX_DS_DD3.X_V2.5_26MAR2007_pub.pdf |title=IBM PowerPC 970FX RISC Microprocessor Datasheet |publisher=01.ibm.com |access-date=November 2, 2010}}</ref>

It has 10 functional units{{snd}} 2 Fixed-Point Units, 2 Load/Store Units, 2 Floating Point Units, 1 Branch Unit, 1 SIMD ALU unit, 1 SIMD Permute unit, and 1 Condition Register. It supports up to 215 instructions in-flight: 16 in the Instruction Fetch Unit, 67 in the Instruction Decode Unit, 100 in the Functional Units, and 32 in the Store Queue. It has 64&nbsp;KBs of directly mapped Instruction Cache and 32&nbsp;KBs of D-Cache.<ref>{{cite web |url=https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/DC3D43B729FDAD2C00257419006FB955/$file/970FX_user_manual.v1.7.2008MAR14_pub.pdf |title=IBM PowerPC 970FX RISC Microprocessor User's Manual V 1.7 |publisher=www-01.ibm.com |access-date=May 21, 2014 |archive-date=May 22, 2014 |archive-url=https://web.archive.org/web/20140522012345/https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/DC3D43B729FDAD2C00257419006FB955/$file/970FX_user_manual.v1.7.2008MAR14_pub.pdf |url-status=live }}</ref>

Apple released 970FX-powered machines throughout 2004: the [[Xserve G5]] in January, the Power Mac G5 in June, and the [[iMac G5]] in August. The Power Mac introduced a top clock speed of 2.5&nbsp;GHz while [[computer cooling|liquid-cooled]] (eventually reaching as high as 2.7&nbsp;GHz in April 2005). The iMac ran the front side bus at a third of the clock speed.

Market demand was intense for a faster laptop CPU than the G4, but Apple never delivered a G5 series CPU in [[PowerBook]] laptops. The original 970 uses far too much power and was never seriously viewed as a candidate for a portable computer. The 970FX reduced [[thermal design power]] (TDP) to about 30 [[Watt (unit)|W]] at 1.5&nbsp;GHz, which led many users to believe a PowerBook G5 might be possible. However, several obstacles prevented even the 970FX from being used in this application. At 1.5&nbsp;GHz, the G5 was not substantially faster than the 1.5 and 1.67&nbsp;GHz G4 processors, which Apple used in PowerBooks instead. Furthermore, the northbridge chips available to interface the 970FX to memory and other devices were not designed for portable computers, and consumed too much power. Finally, the 970FX had inadequate power saving features for a portable CPU. Its minimum (idle) power was much too high, which would have led to poor battery life figures in a notebook computer.{{citation needed|date=November 2010}}