Core details	Core 2 Quad	Core 2 Extreme	Core 2 Extreme	Core 2 Quad	Core 2 Quad	Core 2 Extreme	Core 2 Extreme	Core 2 Extreme
Development name	Kentsfield	Kentsfield XE	Kentsfield XE	Yorkfield	Yorkfield	Yorkfield XE	Yorkfield XE	Yorkfield XE
Construction size (nm)	65	65	65	45	45	45	45	45
Transistor count (millions)	582	582	582	~ 480?	820	820	820	820
Number of processor cores	4	4	4	4	4	4	4	4
Registers - ALU (bits)	64	64	64	64	64	64	64	64
Registers - FPU (bits)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)	80 (128 Ext)
Connection Type	LGA 775	LGA 775	LGA 775	LGA 775	LGA 775	LGA 775	LGA 775	LGA 771
Model Details
Name / Core speed (GHz)	Q6600 / 2.40	QX6700 / 2.67	QX6850 / 3.00	Q9300 / 2.5	Q9450 / 2.67	QX9650 / 3.0	QX9770 / 3.2	QX9775 / 3.2
	Q6700 / 2.67	QX6800 / 2.93			Q9550 / 2.83
FSB Details
CLK speed (MHz)	266	266	333	333	333	333	400	400
Data transfer rate (MHz)	1066	1066	1333	1333	1333	1333	1600	1600
Total bus width (bits)	64	64	64	64	64	64	64	64
Maximum bandwidth (GB/sec)	8.53	8.53	10.67	10.67	10.67	10.67	12.80	12.80
Cache details
L1 amount (KiB)	64 x 4	64 x 4	64 x 4	64 x 4	64 x 4	64 x 4	64 x 4	64 x 4
L1 location	on-die	on-die	on-die	on-die	on-die	on-die	on-die	on-die
L1 instruction cache size (KiB)	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4
L1 data cache size (KiB)	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4	32 x 4
L2 amount (KiB)	4096 x 2	4096 x 2	4096 x 2	3072 x 2	6144 x 2	6144 x 2	6144 x 2	6144 x 2
L2 location	on-die	on-die	on-die	on-die	on-die	on-die	on-die	on-die
L2 bus width (bits)	256	256	256	256	256	256	256	256
Extension support
MMX	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
3DNow!	No	No	No	No	No	No	No	No
SSE	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Enhanced 3DNow!	No	No	No	No	No	No	No	No
3DNow! Professional	No	No	No	No	No	No	No	No
SSE2	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
SSE3	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
SSSE3	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
SSE4	No	No	No	Yes (4.1)	Yes (4.1)	Yes (4.1)	Yes (4.1)	Yes (4.1)
Additional Features
Intel 64	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
AMD64	No	No	No	No	No	No	No	No
HyperThreading	No	No	No	No	No	No	No	No
NX Bit	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Virtualization Technology	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

Notes

© AMD & Intel CPU Specifications - N D Evanson 2008