Athlon 64 X2 3800+ vs Phenom X3 8400

Place in the ranking	2673	2999
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	0.73	0.43
Architecture codename	Toliman (2008)	Manchester (2005−2006)
Release date	March 2008 (16 years ago)	August 2005 (19 years ago)

Detailed specifications

Phenom X3 8400 and Athlon 64 X2 3800+ basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	3 (Tri-Core)	2 (Dual-core)
Threads	3	2
Boost clock speed	2.1 GHz	2 GHz
L1 cache	128 KB (per core)	256K
L2 cache	512 KB (per core)	512 KB
L3 cache	2 MB (shared)	0 KB
Chip lithography	65 nm	90 nm
Die size	285 mm²	220 mm²
Number of transistors	450 million	154 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Phenom X3 8400 and Athlon 64 X2 3800+ compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	1	1
Socket	AM2+	939
Power consumption (TDP)	95 Watt	89 Watt

Virtualization technologies

Virtual machine speed-up technologies supported by Phenom X3 8400 and Athlon 64 X2 3800+ are enumerated here.

AMD-V

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Phenom X3 8400 0.73
+82.5%

Athlon 64 X2 3800+ 0.40

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Phenom X3 8400 1164
+85.1%

Athlon 64 X2 3800+ 629

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

Phenom X3 8400 190

Athlon 64 X2 3800+ 203
+6.8%

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

Phenom X3 8400 540
+43.6%

Athlon 64 X2 3800+ 376

Gaming performance

Pros & cons summary

Performance score	0.73	0.40
Physical cores	3	2
Threads	3	2
Chip lithography	65 nm	90 nm
Power consumption (TDP)	95 Watt	89 Watt

Phenom X3 8400 has a 82.5% higher aggregate performance score, 50% more physical cores and 50% more threads, and a 38.5% more advanced lithography process.

Athlon 64 X2 3800+, on the other hand, has 6.7% lower power consumption.

The Phenom X3 8400 is our recommended choice as it beats the Athlon 64 X2 3800+ in performance tests.

Should you still have questions on choice between Phenom X3 8400 and Athlon 64 X2 3800+, ask them in Comments section, and we shall answer.