AMD Athlon II X4 651 vs AMD Phenom II X4 840T

Comparative analysis of AMD Athlon II X4 651 and AMD Phenom II X4 840T processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Virtualization. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark, Geekbench 4 - Single Core, Geekbench 4 - Multi-Core, CompuBench 1.5 Desktop - Face Detection (mPixels/s), CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s), CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s), CompuBench 1.5 Desktop - T-Rex (Frames/s).

AMD Athlon II X4 651

AMD Phenom II X4 840T

Differences

Reasons to consider the AMD Athlon II X4 651

CPU is newer: launch date 1 year(s) 2 month(s) later
Around 3% higher clock speed: 3 GHz vs 2.9 GHz
A newer manufacturing process allows for a more powerful, yet cooler running processor: 32 nm vs 45 nm
2x more L2 cache, more data can be stored in the L2 cache for quick access later
Around 2% better performance in PassMark - Single thread mark: 1287 vs 1264
Around 7% better performance in PassMark - CPU mark: 2500 vs 2330

Specifications (specs)
Launch date	November 2011 vs September 2010
Maximum frequency	3 GHz vs 2.9 GHz
Manufacturing process technology	32 nm vs 45 nm
L2 cache	1024 KB (per core) vs 512 KB (per core)
Benchmarks
PassMark - Single thread mark	1287 vs 1264
PassMark - CPU mark	2500 vs 2330

Reasons to consider the AMD Phenom II X4 840T

Around 5% lower typical power consumption: 95 Watt vs 100 Watt
Around 19% better performance in CompuBench 1.5 Desktop - Face Detection (mPixels/s): 3.606 vs 3.042

Specifications (specs)
Thermal Design Power (TDP)	95 Watt vs 100 Watt
Benchmarks
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	3.606 vs 3.042

Compare benchmarks

CPU 1: AMD Athlon II X4 651
CPU 2: AMD Phenom II X4 840T

PassMark - Single thread mark

CPU 1

CPU 2

1287

1264

PassMark - CPU mark

CPU 1

CPU 2

2500

2330

CompuBench 1.5 Desktop - Face Detection (mPixels/s)

CPU 1

CPU 2

3.042

3.606

Name	AMD Athlon II X4 651	AMD Phenom II X4 840T
PassMark - Single thread mark	1287	1264
PassMark - CPU mark	2500	2330
Geekbench 4 - Single Core	396
Geekbench 4 - Multi-Core	1335
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	3.042	3.606
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)	3.69
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)		9.486
CompuBench 1.5 Desktop - T-Rex (Frames/s)		0.186

Compare specifications (specs)

	AMD Athlon II X4 651	AMD Phenom II X4 840T
Essentials
Architecture codename	Llano	Zosma
Launch date	November 2011	September 2010
Place in performance rating	2708	2714
Price now	$178.04	$69.99
Value for money (0-100)	5.93	15.15
Vertical segment	Desktop	Desktop
Launch price (MSRP)		$80
Performance
64 bit support
Die size	228 mm	346 mm
L1 cache	128 KB (per core)	128 KB (per core)
L2 cache	1024 KB (per core)	512 KB (per core)
Manufacturing process technology	32 nm	45 nm
Maximum frequency	3 GHz	2.9 GHz
Number of cores	4	4
Transistor count	1178 million	904 million
L3 cache		6144 KB (shared)
Memory
Supported memory types	DDR3	DDR3
Compatibility
Max number of CPUs in a configuration	1	1
Sockets supported	FM1	AM3
Thermal Design Power (TDP)	100 Watt	95 Watt
Virtualization
AMD Virtualization (AMD-V™)