Core 2 Duo E6540 vs Pentium D 820

Place in the ranking	3101	2884
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Series	Pentium D	no data
Power efficiency	0.31	0.74
Architecture codename	Smithfield (2005)	no data
Release date	May 2005 (19 years ago)	1 July 2007 (17 years ago)

Detailed specifications

Pentium D 820 and Core 2 Duo E6540 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	no data
Base clock speed	2.8 GHz	2.33 GHz
Boost clock speed	2.8 GHz	no data
Bus rate	800 MHz	1333 MHz
L1 cache	28 KB	no data
L2 cache	2 MB	no data
L3 cache	0 KB	4 MB L2 Cache
Chip lithography	90 nm	65 nm
Die size	206 mm²	no data
Maximum core temperature	64 °C	72 °C
Number of transistors	169 million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	0.85V-1.5V

Compatibility

Information on Pentium D 820 and Core 2 Duo E6540 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	2	no data
Socket	PLGA775	PLGA775
Power consumption (TDP)	95 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Core 2 Duo E6540. 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	-	-
PAE	32 Bit	no data
FSB parity	-	-

Security technologies

Pentium D 820 and Core 2 Duo E6540 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Pentium D 820 and Core 2 Duo E6540 are enumerated here.

VT-d	-	no data
VT-x	-	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Core 2 Duo E6540. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

no data

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.

Pentium D 820 0.31

Core 2 Duo E6540 0.51
+64.5%

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.

Pentium D 820 499

Core 2 Duo E6540 808
+61.9%