AMD Athlon II X4 638

AMD Athlon™ II Processor Model Numbers and Comparisons 

AMD Athlon™ II X4 Quad-Core Processor
Model Number	Frequency	CMOS Technology	Total Dedicated L2 Cache	Packaging	Thermal Design Power
651	3.0 GHz	32nm SOI	4MB	socket FM1	100W
645	3.1 GHz	45nm SOI	2MB	socket AM3	95W
641	2.8 GHz	32nm SOI	4MB	socket FM1	100W
640	3.0 GHz	45nm SOI	2MB	socket AM3	95W
638	2.7 GHz	32nm SOI	4MB	socket FM1	65W
631	2.6 GHz	32nm SOI	4MB	socket FM1	100W

Energy Efficient AMD Athlon™ II X4 Quad-Core Processor
Model Number	Frequency	CMOS Technology	Total Dedicated L2 Cache	Packaging	Thermal Design Power
620e	2.6 GHz	45nm SOI	2MB	socket AM3	45W
615e	2.5 GHz	45nm SOI	2MB	socket AM3	45W

AMD Athlon™ II X3 Triple-Core Processor
Model Number	Frequency	CMOS Technology	Total Dedicated L2 Cache	Packaging	Thermal Design Power
460	3.4 GHz	45nm SOI	1.5MB	socket AM3	95W
455	3.3 GHz	45nm SOI	1.5MB	socket AM3	95W
450	3.2 GHz	45nm SOI	1.5MB	socket AM3	95W

Energy Efficient AMD Athlon™ II X3 Triple-Core Processor
Model Number	Frequency	CMOS Technology	Total Dedicated L2 Cache	Packaging	Thermal Design Power
425e	2.7 GHz	45nm SOI	1.5MB	socket AM3	45W
420e	2.6 GHz	45nm SOI	1.5MB	socket AM3	45W

AMD Athlon™ II X2 Dual-Core Processor
Model Number	Frequency	CMOS Technology	Total Dedicated L2 Cache	Packaging	Thermal Design Power
270	3.4 GHz	45nm SOI	2MB	socket AM3	65W
265	3.3 GHz	45nm SOI	2MB	socket AM3	65W
260	3.2 GHz	45nm SOI	2MB	socket AM3	65W
255	3.1 GHz	45nm SOI	2MB	socket AM3	65W
250	3.0 GHz	45nm SOI	2MB	socket AM3	65W
240	2.8 GHz	45nm SOI	2MB	socket AM3	65W

Energy Efficient AMD Athlon™ II X2 Dual-Core Processor
Model Number	Frequency	CMOS Technology	Total Dedicated L2 Cache	Packaging	Thermal Design Power
250e	3.0GHz	45nm SOI	2MB	socket AM3	45W
245e	2.9GHz	45nm SOI	2MB	socket AM3	45W

AMD64 Technology	Yes
Simultaneous 32- & 64-bit computing	Yes
L1 Cache (Instruction + Data)	64K of L1 instruction and 64K of L1 data cache per core X2 - 256KB total L1 per processor X3 – 384KB total L1 per processor X4 - 512KB total L1 per processor
L2 Cache (total dedicated)	X2 - 2MB X3 – 1.5MB  X4 - 2MB
Integrated DDR Memory Controller	Yes
Memory Controller Width	128-bit
Type of Memory Supported	X2 - Support for unregistered DIMMs up to PC2-8500 (DDR2-1066MHz) -AND- PC3-8500 (DDR3-1066MHz) X3 and X4 - Support for unregistered DIMMs up to PC2-8500 (DDR2-1066MHz) -AND- PC3 10600 (DDR3-1333MHz)
Total Processor-to-System Bandwidth	X2 – Up to 33.1GB/s bandwidth [Up to 17.1 GB/s total bandwidth (DDR3-1066) + 16.0GB/s (HT3)] Up to 28.8GB/s bandwidth  [Up to 12.8 GB/s total bandwidth (DDR2-1066) + 16.0GB/s (HT3)] X3 and X4 – Up to 37.3GB/s total bandwidth [Up to 21.3 GB/s memory bandwidth (DDR3-1333) + 16.0GB/s (HT3)] Up to 28.8GB/s bandwidth [Up to 12.8 GB/s total bandwidth (DDR2-1066) + 16.0GB/s (HT3)]
Thermal Design Power	45W, 65W and 95W
Manufacturing Sites	GLOBALFOUNDRIES Fab 1 Module 1.

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http://www.amd.com/us/products/desktop/processors/athlon-ii-x2/Pages/AMD-athlon-ii-x2-processor-model-numbers-feature-comparison.aspx