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					General information
				 | 
			
			
				| 
					Type
				 | 
				
					CPU / Microprocessor
				 | 
			
			
				| 
					Market segment
				 | 
				
					Server
				 | 
			
			
				| 
					Family
				 | 
				
					
Intel Pentium Pro
				 | 
			
			
				| 
					CPU part numbers
				 | 
				
					
						- 
							KB80521EX166 512K is an OEM/tray microprocessor
						
 
						- 
							BP80521166 512K is a boxed microprocessor
						
 
					 
				 | 
			
			
				| 
					Frequency   
				 | 
				
					166 MHz
				 | 
			
			
				| 
					Bus speed   
				 | 
				
					66 MHz
				 | 
			
			
				| 
					Clock multiplier   
				 | 
				
					2.5
				 | 
			
			
				| 
					Package
				 | 
				
					387-pin Modified Staggered Ceramic Pin Grid Array with gold plated heat spreader 
2.66" x 2.46" (6.76 cm x 6.25 cm)
				 | 
			
			
				| 
					Socket
				 | 
				
					Socket 8
				 | 
			
			
				| 
					Weight
				 | 
				
					3.2oz / 90g
				 | 
			
			
				| 
					Introduction date
				 | 
				
					1-Nov-95
				 | 
			
			
				| 
					Upgrade options
				 | 
				
					Pentium II Overdrive
				 | 
			
			
				| 
					S-spec numbers
				 | 
			
			
				
					
						
							
								
									| 
										Part number
									 | 
									
										ES/QS processors
									 | 
									
										Production processors
									 | 
								 
								
									| 
										 
									 | 
									
										Q0864
									 | 
									
										Q0918
									 | 
									
										Q0929
									 | 
									
										Q935
									 | 
									
										SL22X
									 | 
									
										SL2FJ
									 | 
									
										SY034
									 | 
									
										SY047
									 | 
								 
								
									| 
										BP80521166 512K
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										KB80521EX166 512K
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				 | 
			
			
				| 
					Architecture / Microarchitecture
				 | 
			
			
				| 
					Microarchitecture
				 | 
				
					P6
				 | 
			
			
				| 
					Core steppings   
				 | 
				
					sA0 (Q0864) 
sA1 (Q0918, Q0929, Q935, SY034, SY047) 
sB1 (SL22X, SL2FJ)
				 | 
			
			
				| 
					CPUIDs
				 | 
				
					616 (Q0864) 
617 (Q0918, Q0929, Q935, SY034, SY047) 
619 (SL22X, SL2FJ)
				 | 
			
			
				| 
					Manufacturing process
				 | 
				
					0.35 and 0.6 micron 
5.5 million transistors
				 | 
			
			
				| 
					Data width
				 | 
				
					32 bit
				 | 
			
			
				| 
					Data bus width
				 | 
				
					64 bit
				 | 
			
			
				| 
					Floating Point Unit
				 | 
				
					Integrated
				 | 
			
			
				| 
					Level 1 cache size   
				 | 
				
					8 KB four-way set associative code 
8 KB two-way set associative data
				 | 
			
			
				| 
					Level 2 cache size   
				 | 
				
					512 KB
				 | 
			
			
				| 
					Pipeline
				 | 
				
					12-stage
				 | 
			
			
				| 
					Multiprocessing
				 | 
				
					Up to 4 processors
				 | 
			
			
				| 
					Low power features
				 | 
				
					
						- 
							Stop Grant mode   
						
 
						- 
							Auto HALT mode   
						
 
					 
				 | 
			
			
				| 
					Electrical / Thermal parameters
				 | 
			
			
				| 
					V core   
				 | 
				
					3.3V ± 5%
				 | 
			
			
				| 
					Minimum/Maximum operating temperature   
				 | 
				
					0°C - 85°C
				 | 
			
			
				| 
					Minimum/Typical/Maximum power dissipation
				 | 
				
					3.96 Watt (Stop Grant mode) / 27.5 Watt / 38.81 Watt
				 | 
			
			
				| 
					Thermal Design Power   
				 | 
				
					35 Watt
				 | 
			
			
				| 
					Notes on Intel Pentium Pro 166 MHz
				 | 
			
			
				
					
						
							- 
								Minimum core frequency is 150 MHz
							
 
							- 
								Minum bus frequency is 50 MHz
							
 
						 
					 
				 |