Pentium G645T vs Pentium D 820

Primary details

Comparing Pentium D 820 and Pentium G645T processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	2627
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Series	Pentium D	no data
Power efficiency	no data	2.08
Architecture codename	Smithfield (2005)	Sandy Bridge (2011−2013)
Release date	May 2005 (19 years ago)	2 September 2012 (12 years ago)

Detailed specifications

Pentium D 820 and Pentium G645T 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	2.8 GHz	2.5 GHz
Boost clock speed	2.8 GHz	2.5 GHz
Bus rate	800 MHz	5 GT/s
L1 cache	28 KB	64 KB (per core)
L2 cache	2 MB	256 KB (per core)
L3 cache	0 KB	3 MB (shared)
Chip lithography	90 nm	32 nm
Die size	206 mm2	131 mm2
Maximum core temperature	64 °C	65 °C
Number of transistors	169 million	504 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 820 and Pentium G645T 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	1
Socket	PLGA775	FCLGA1155
Power consumption (TDP)	95 Watt	35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Pentium G645T. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2
AVX	-	+
Enhanced SpeedStep (EIST)	-	+
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	+	+
Thermal Monitoring	-	+
Flex Memory Access	no data	+
Demand Based Switching	-	no data
PAE	32 Bit	no data
FDI	no data	+
Fast Memory Access	no data	+
FSB parity	-	no data

Security technologies

Pentium D 820 and Pentium G645T 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 Pentium G645T are enumerated here.

VT-d	-	-
VT-x	-	+
EPT	no data	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Pentium G645T. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR3
Maximum memory size	no data	32 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	17 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel® HD Graphics for 2nd Generation Intel® Processors
Graphics max frequency	no data	1.1 GHz

Graphics interfaces

Available interfaces and connections of Pentium D 820 and Pentium G645T integrated GPUs.

Number of displays supported

no data

2

Peripherals

Specifications and connection of peripherals supported by Pentium D 820 and Pentium G645T.

PCIe version	no data	2.0
PCI Express lanes	no data	16

Synthetic benchmark performance

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

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Pros & cons summary

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Chip lithography	90 nm	32 nm
Power consumption (TDP)	95 Watt	35 Watt

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Should you still have questions on choice between Pentium D 820 and Pentium G645T, ask them in Comments section, and we shall answer.

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