Core 2 Duo E6400 vs Core 2 Duo E6550

Place in the ranking	2821	2887
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	0.82	0.71
Architecture codename	Conroe (2006−2007)	Conroe (2006−2007)
Release date	July 2007 (17 years ago)	July 2006 (18 years ago)

Detailed specifications

Core 2 Duo E6550 and Core 2 Duo E6400 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)	2 (Dual-core)
Threads	2	2
Base clock speed	2.33 GHz	2.13 GHz
Boost clock speed	2.33 GHz	2.13 GHz
Bus rate	1333 MHz	1066 MHz
L1 cache	64 KB	64 KB
L2 cache	4 MB	2 MB
L3 cache	0 KB	0 KB
Chip lithography	65 nm	65 nm
Die size	143 mm²	143 mm²
Maximum core temperature	72 °C	61 °C
Number of transistors	291 million	291 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	0.85V-1.5V	0.85V-1.5V

Compatibility

Information on Core 2 Duo E6550 and Core 2 Duo E6400 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	PLGA775	LGA775,PLGA775
Power consumption (TDP)	65 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo E6550 and Core 2 Duo E6400. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	+	+
Thermal Monitoring	+	+
Demand Based Switching	-	-
FSB parity	-	-

Security technologies

Core 2 Duo E6550 and Core 2 Duo E6400 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Duo E6550 and Core 2 Duo E6400 are enumerated here.

VT-x

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Duo E6550 and Core 2 Duo E6400. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

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.

Core 2 Duo E6550 0.56
+14.3%

Core 2 Duo E6400 0.49

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.

Core 2 Duo E6550 896
+14.9%

Core 2 Duo E6400 780

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.

Core 2 Duo E6550 260
+11.6%

Core 2 Duo E6400 233

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.

Core 2 Duo E6550 431
+15.2%

Core 2 Duo E6400 374