Core 2 Quad Q9500 vs Pentium D 820

Place in the ranking	3084	2212
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	1.39
Architecture codename	Smithfield (2005)	no data
Release date	May 2005 (19 years ago)	no data (2024 years ago)

Detailed specifications

Pentium D 820 and Core 2 Quad Q9500 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)	4 (Quad-Core)
Threads	2	4
Base clock speed	2.8 GHz	2.83 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	6 MB L2 Cache
Chip lithography	90 nm	45 nm
Die size	206 mm²	no data
Maximum core temperature	64 °C	71 °C
Number of transistors	169 million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	0.85V-1.3625V

Compatibility

Information on Pentium D 820 and Core 2 Quad Q9500 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	LGA775
Power consumption (TDP)	95 Watt	95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Core 2 Quad Q9500. 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	-	no data

Security technologies

Pentium D 820 and Core 2 Quad Q9500 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 Quad Q9500 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 Quad Q9500. 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 Quad Q9500 1.40
+352%

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 Quad Q9500 2224
+346%

Gaming performance

Pros & cons summary

Performance score	0.31	1.40
Physical cores	2	4
Threads	2	4
Chip lithography	90 nm	45 nm

Core 2 Quad Q9500 has a 351.6% higher aggregate performance score, 100% more physical cores and 100% more threads, and a 100% more advanced lithography process.

The Core 2 Quad Q9500 is our recommended choice as it beats the Pentium D 820 in performance tests.

Should you still have questions on choice between Pentium D 820 and Core 2 Quad Q9500, ask them in Comments section, and we shall answer.