However, AMD used what it called a PR rating, or performance rating, to label the chips according to their suggested equivalence in integer performance to a Pentium of that clock speed. Thus, a 116 MHz chip from the second line was marketed as the "K5 PR166". Manufacturing delays caused the PR200's arrival to nearly align with the release of K6. Since AMD did not want the two chips competing, the K5-PR200 only arrived in small numbers. SSA/5 Sold as 5K86 P75 to P100, later as K5 PR75 to PR100 4.3 million transistors in 500 or 350 nm L1-Cache: 8 + 16 KB (data + instructions) Socket 5 and Socket 7 VCore: 3.52 V Front side bus: 50 (PR75), 60 (PR90), 66 MHz (PR100) First release: March 27, 1996 Clockrate: 75, 90, 100 MHz 5k86 Sold as K5 PR120 to PR166; later PR200 4.3 million transistors in 350 nm L1-Cache: 8 + 16 KB (data + instructions) Socket 5 and Socket 7 VCore: 3.52 V Front side bus: 60 (PR120/150), 66 MHz First release: October 7, 1996 Clockrate: 90 (PR120), 100 (PR133), 105 (PR150), 116.6 (PR166), 133 MHz (PR200) References Further reading Gwennap, Linley (25 March 1996). "AMD Ships Pentium Competitor". Microprocessor Report. Slater, Michael (24 October 1994). "AMD's K5 Designed to Outrun Pentium". Microprocessor Report. Slater, Michael (8 May 1995). "AMD K5 Volume Slips into 1996". Microprocessor Report. External links AMD: AMD-K5 Processor Overview Technical overview of the K5 series Pictures of K5 chips at CPUShack.com The AMD K5, a much underrated chip AMD K5 technical specifications AMD x86 microprocessors AMD microarchitectures X86 microarchitectures Computer-related introductions in 1996