Core details	Athlon	Athlon	Athlon	Athlon	Athlon	Athlon	Athlon
Development name	Argon (K7)	Pluto (K75)	Pluto (K75)	Orion (K75)	Thunderbird	Thunderbird	Thunderbird
Construction size (nm)	250	180	180	180	180	180	180
Transistor count (millions)	22	22	22	22	37	37	37
Number of processor cores	1	1	1	1	1	1	1
Registers - ALU (bits)	32	32	32	32	32	32	32
Registers - FPU (bits)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)
Connection Type	Slot A	Slot A	Slot A	Slot A	Slot / Socket A	Socket A	Socket A
Model Details
Name / Core speed (GHz)	500	550	750	900	600	1100B	1000C
	550	600	800	950	650	1200B	1133C
	600	650	850	1000	700	1300B	1200C
	650	700			750	1400B	1333C
	700				800		1400C
					850
					900
					950
					1000B
FSB Details
CLK speed (MHz)	100	100	100	100	100	100	133
Data transfer rate (MHz)	200	200	200	200	200	200	266
Total bus width (bits)	64	64	64	64	64	64	64
Maximum bandwidth (GB/sec)	1.60	1.60	1.60	1.60	1.60	1.60	2.13
Cache details
L1 amount (KiB)	128	128	128	128	128	128	128
L1 location	on-die	on-die	on-die	on-die	on-die	on-die	on-die
L1 instruction cache size (KiB)	64	64	64	64	64	64	64
L1 data cache size (KiB)	64	64	64	64	64	64	64
L2 amount (KiB)	512 1	512 1	512 2	512 3	256	256	256
L2 location	CPU PCB	CPU PCB	CPU PCB	CPU PCB	on-die	on-die	on-die
L2 bus width (bits)	64	64	64	64	64	64	64
Extension support
MMX	Yes	Yes	Yes	Yes	Yes	Yes	Yes
3DNow!	Yes	Yes	Yes	Yes	Yes	Yes	Yes
SSE	No	No	No	No	No	No	No
Enhanced 3DNow!	Yes	Yes	Yes	Yes	Yes	Yes	Yes
3DNow! Professional	No	No	No	No	No	No	No
SSE2	No	No	No	No	No	No	No
SSE3	No	No	No	No	No	No	No
SSSE3	No	No	No	No	No	No	No
Additional Features
Intel 64	No	No	No	No	No	No	No
AMD64	No	No	No	No	No	No	No
HyperThreading	No	No	No	No	No	No	No
NX Bit	No	No	No	No	No	No	No
Virtualization Technology	No	No	No	No	No	No	No

Notes

1 - L2 cache SRAM chips run at 50% of CPU clock speed

2 - L2 cache SRAM chips run at 40% of CPU clock speed

3 - L2 cache SRAM chips run at 33% of CPU clock speed

© AMD & Intel CPU Specifications - N D Evanson 2008