POWER3 vs. POWER4
 

Per CPU Characteristics	Winter Hawk 2 (asp/bsp)	Regatta (Snow/Frost)
Clock Speed (MHz)	375	1300
L1 Data Cache (Kbytes)	64	32
L2 Data Cache (Kbytes)	8192	720
L3 Cache (Kbytes)	0	16384
Floating Point Latency (Clocks)	3	6
Memory Bandwidth (MBytes/sec)	285	913

POWER4 Cache Structure
 

Component	Organization	Capacity
L1 Instruction Cache	Direct Map, 128-byte line	64 KBs per CPU
L1 Data Cache	Two-way, 128-byte line	32 KBs per CPU
L2 Cache	Eight-way, 128-byte line	1440 KBs shared by 2 CPUs
L3 Cache	Eight-way, 512-byte line	128 MBs shared by 8 CPUs

 

Back to Main Page