Athlon 64 FX-55 vs Athlon 64 X2 3800+

Place in the ranking	3013	3163
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	0.43	0.23
Architecture codename	Manchester (2005−2006)	Clawhammer (2001−2005)
Release date	August 2005 (19 years ago)	10 October 2004 (20 years ago)
Launch price (MSRP)	no data	$180

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

Athlon 64 X2 3800+ and Athlon 64 FX-55 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	2 (Dual-core)	1 (Single-Core)
Threads	2	1
Base clock speed	no data	2.6 GHz
Boost clock speed	2 GHz	2.6 GHz
L1 cache	256K	128 KB
L2 cache	512 KB	1 MB
L3 cache	0 KB	0 KB
Chip lithography	90 nm	130 nm
Die size	220 mm²	193 mm²
Maximum case temperature (TCase)	no data	63 °C
Number of transistors	154 million	105 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+

Compatibility

Information on Athlon 64 X2 3800+ and Athlon 64 FX-55 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	939	939
Power consumption (TDP)	89 Watt	104 Watt

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon 64 X2 3800+ and Athlon 64 FX-55. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

no data

DDR1 Depends on motherboard

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

On certain motherboards (Chipset feature)

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.

Athlon 64 X2 3800+ 0.40
+60%

Athlon 64 FX-55 0.25

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.

Athlon 64 X2 3800+ 629
+55.7%

Athlon 64 FX-55 404

Gaming performance

Pros & cons summary

Performance score	0.40	0.25
Physical cores	2	1
Threads	2	1
Chip lithography	90 nm	130 nm
Power consumption (TDP)	89 Watt	104 Watt

Athlon 64 X2 3800+ has a 60% higher aggregate performance score, 100% more physical cores and 100% more threads, a 44.4% more advanced lithography process, and 16.9% lower power consumption.

The Athlon 64 X2 3800+ is our recommended choice as it beats the Athlon 64 FX-55 in performance tests.

Should you still have questions on choice between Athlon 64 X2 3800+ and Athlon 64 FX-55, ask them in Comments section, and we shall answer.