Phenom II X2 B55 vs Core 2 Quad Q9400

Aggregate performance score

Core 2 Quad Q9400
2008
4 cores / 4 threads, 95 Watt
1.35
+82.4%
Phenom II X2 B55
2009
2 cores / 2 threads, 80 Watt
0.74

Core 2 Quad Q9400 outperforms Phenom II X2 B55 by an impressive 82% based on our aggregate benchmark results.

Primary details

Comparing Core 2 Quad Q9400 and Phenom II X2 B55 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking22562672
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluationno data2.02
Market segmentDesktop processorDesktop processor
Power efficiency1.340.87
Architecture codenameYorkfield (2007−2009)Callisto (2009−2010)
Release dateAugust 2008 (16 years ago)1 October 2009 (15 years ago)
Launch price (MSRP)no data$48

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

Core 2 Quad Q9400 and Phenom II X2 B55 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 cores4 (Quad-Core)2 (Dual-core)
Threads42
Base clock speed2.66 GHz3 GHz
Boost clock speed2.67 GHz3 GHz
Bus rate1333 MHzno data
L1 cache64K (per core)128 KB (per core)
L2 cache6 MB (shared)512 KB (per core)
L3 cache0 KB6 MB (shared)
Chip lithography45 nm45 nm
Die size2x 81 mm2258 mm2
Maximum case temperature (TCase)71 °Cno data
Number of transistors456 million758 million
64 bit support++
Windows 11 compatibility--
VID voltage range0.85V-1.3625Vno data

Compatibility

Information on Core 2 Quad Q9400 and Phenom II X2 B55 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 configuration11
SocketLGA775AM3
Power consumption (TDP)95 Watt80 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Phenom II X2 B55. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)+no data
Turbo Boost Technology-no data
Hyper-Threading Technology-no data
Idle States+no data
Thermal Monitoring+-
Demand Based Switching-no data
FSB parity-no data

Security technologies

Core 2 Quad Q9400 and Phenom II X2 B55 technologies aimed at improving security, for example, by protecting against hacks.

TXT+no data
EDB+no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Quad Q9400 and Phenom II X2 B55 are enumerated here.

AMD-V-+
VT-d+no data
VT-x+no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Phenom II X2 B55. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR1, DDR2, DDR3DDR3

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardno dataOn certain motherboards (Chipset feature)

Peripherals

Specifications and connection of peripherals supported by Core 2 Quad Q9400 and Phenom II X2 B55.

PCIe versionno data2.0

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 Quad Q9400 1.35
+82.4%
Phenom II X2 B55 0.74

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 Quad Q9400 2138
+80.7%
Phenom II X2 B55 1183

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 Quad Q9400 334
Phenom II X2 B55 383
+14.7%

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 Quad Q9400 925
+34.6%
Phenom II X2 B55 687

Gaming performance

Pros & cons summary


Performance score 1.35 0.74
Physical cores 4 2
Threads 4 2
Power consumption (TDP) 95 Watt 80 Watt

Core 2 Quad Q9400 has a 82.4% higher aggregate performance score, and 100% more physical cores and 100% more threads.

Phenom II X2 B55, on the other hand, has 18.8% lower power consumption.

The Core 2 Quad Q9400 is our recommended choice as it beats the Phenom II X2 B55 in performance tests.


Should you still have questions on choice between Core 2 Quad Q9400 and Phenom II X2 B55, ask them in Comments section, and we shall answer.

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Intel Core 2 Quad Q9400
Core 2 Quad Q9400
AMD Phenom II X2 B55
Phenom II X2 B55

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Community ratings

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Questions & comments

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