SP Processor Comparisons
	Thin	Thin 2	Wide 2 cards	Wide 4-8 cards	P2SC Wide	P2SC Thin	SMP High
Nodes per frame	16	16	8	8	8	8	4
Clock Speed (MHz)	66	66	66	66	135	120	112
Peak Megaflops	266	266	266	266	540	480	448
Instruction Cache (KB)	32	32	32	32	32	32	16
Memory (MB)	64-512	64-512	64-512	64-2048	64-2048	64-1024	64-2048
Data Cache (KB)	64	128	128	256	128	128	16
Memory to Data Cache Bus	64 bit	128 bit	128 bit	256 bit	256 bit	256 bit	256 bit
Data Cache to Processor Bus	128 bit	256 bit	256 bit	256 bit	256 bit	256 bit	256 bit
Disk (GB)	1-18	1-18	1-36	1-36	2-36	2-18	2-6.6
Microchannel Adapter Slots	4	4	8	8	8	4	14
L2 Cache (MB)	0-1	0-2	n/a	n/a	n/a	n/a	0-1

Note: 77 MHz Wide node not shown

• Although all nodes have the same clock speed, actual performance may be affected by cache size, memory-cache bus and cache-processor bus. For example:

  • Thin Node with 2 memory cards - has a 64-bit (8 byte) memory-cache bus which allows a data transfer rate of 533 Mbytes/sec. (@66 million floats)

  • Wide Node with 2 memory cards - has a 128-bit (16 byte) memory-cache bus which allows a data transfer rate of 1.07 Gbytes/sec. (@125 million floats)

  • Wide Node with 4 or 8 memory cards - has a 256-bit (32 byte) memory-cache bus which allows a data transfer rate of 2.13 Gbytes/sec. (@266 million floats)