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AMD Athlon II X4 645
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AMD Athlon II X4 645

Overall rating 7/10

Bumping up 100MHz from the older AMD Athlon II X4 640, the 645 is now at 3.1GHz and provides an affordable option for those looking to get a quad-core processor.

Inexpensive quad-core processor
Single/dual-threaded performance lacks bite

Product Specification

Processor Model AMD Athlon II X4 645
Rated Processor Frequency 3.1GHz
Max Processor Frequency 3.1GHz
No. of Cores 2
Base Clock 200MHz
Bus Type HyperTransport 3.0
Bus Speed 2.0GHz
L1 Cache (data + instruction) 64K of L1 instruction and 64K of L1 data cache per core
L2 Cache 512KB of L2 data cache per core
Memory Controller Integrated Dual Channel (up to DDR3-1333)
TDP (W) 95W
Instruction Set Support MMX, SSE, SSE2, SSE3, SSE4a
Execute Disable Bit Yes
64-bit Processing Technology Yes
Enhanced Intel SpeedStep Technology (EIST) / AMD Cool 'n' Quiet Yes
Virtualization Technology AMD-V
Packaging Socket AM3
Process Technology 45nm SOI
Processor Codename Propus
No. of Transistors 300 million

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