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Core 2 Quad Q9400 vs Core 2 Duo E8400
Aggregate performance score
Core 2 Duo E840020082 cores / 2 threads, 65 Watt
0.75
Core 2 Quad Q940020084 cores / 4 threads, 95 Watt
1.37
+82.7%
i3-12100F
i5-13600K
i9-14900KS
Ryzen 5 5500
Ryzen 5 7500F
Ryzen 7 7800X3D
Ryzen Threadripper PRO 7995WX
Core 2 Quad Q9400 outperforms Core 2 Duo E8400 by an impressive 83% based on our aggregate benchmark results. Contents Primary details Cost-effectiveness evaluation Detailed specifications Compatibility Supported technologies RAM capacity and type Integrated graphics cards Performance benchmarks Gaming capabilities Pros & cons summary Vote for your favorite Similar processor comparisons Community ratings Questions & comments Core 2 Duo E8400 Core 2 Quad Q9400 Primary detailsComparing Core 2 Duo E8400 and Core 2 Quad Q9400 processor market type (desktop or notebook), architecture, sales start time and price. Place in performance ranking25622143Place by popularitynot in top-100not in top-100Cost-effectiveness evaluation1.863.51Market segmentDesktop processorDesktop processorArchitecture codenameWolfdale (2008−2010)Yorkfield (2007−2009)Release date1 January 2008 (16 years ago)August 2008 (15 years ago)Current price$61 $73 Cost-effectiveness evaluationPerformance per price, higher is better. Core 2 Quad Q9400 has 89% better value for money than Core 2 Duo E8400. Detailed specificationsCore 2 Duo E8400 and Core 2 Quad Q9400 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 cores2 (Dual-core)4 (Quad-Core)Threads24Base clock speed3 GHz2.66 GHzBoost clock speed3 GHz2.67 GHzL1 cache64 KB (per core)64K (per core)L2 cache6 MB (shared)6 MB (shared)L3 cache0 KB0 KBChip lithography45 nm45 nmDie size104 mm22x 81 mm2Maximum core temperature72 °C71 °CMaximum case temperature (TCase)72 °C71 °CNumber of transistors410 million456 million64 bit support++Windows 11 compatibility--Unlocked multiplierNoNoVID voltage range0.85V-1.3625V0.85V-1.3625V CompatibilityInformation on Core 2 Duo E8400 and Core 2 Quad Q9400 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 configuration11SocketLGA775LGA775Power consumption (TDP)65 Watt95 Watt Technologies and extensionsTechnological solutions and additional instructions supported by Core 2 Duo E8400 and Core 2 Quad Q9400. You'll probably need this information if you require some particular technology. AES-NI--Enhanced SpeedStep (EIST)++Turbo Boost Technology--Hyper-Threading Technology--Idle States++Thermal Monitoring++Demand Based Switching--FSB parity--StatusDiscontinuedDiscontinued Security technologiesCore 2 Duo E8400 and Core 2 Quad Q9400 technologies aimed at improving security, for example, by protecting against hacks. TXT++EDB++ Virtualization technologiesVirtual machine speed-up technologies supported by Core 2 Duo E8400 and Core 2 Quad Q9400 are enumerated here. VT-d++VT-x++ Memory specsTypes, maximum amount and channel quantity of RAM supported by Core 2 Duo E8400 and Core 2 Quad Q9400. Depending on the motherboard, higher memory frequencies may be supported. Supported memory typesDDR1, DDR2, DDR3DDR1, DDR2, DDR3 Graphics specificationsGeneral parameters of integrated GPUs, if any. Integrated graphics cardOn certain motherboards (Chipset feature)no data PeripheralsSpecifications and connection of peripherals supported by Core 2 Duo E8400 and Core 2 Quad Q9400. PCIe version2.0no data Synthetic benchmark performanceVarious benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better. Combined synthetic benchmark scoreThis 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 E8400 0.75 Core 2 Quad Q9400 1.37 +82.7%Core 2 Quad Q9400 outperforms Core 2 Duo E8400 by 83% based on our aggregate benchmark results. PassmarkPassmark 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. Benchmark coverage: 68% Core 2 Duo E8400 1165 Core 2 Quad Q9400 2125 +82.4%Core 2 Quad Q9400 outperforms Core 2 Duo E8400 by 82% in Passmark. GeekBench 5 Single-CoreGeekBench 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. Benchmark coverage: 42% Core 2 Duo E8400 369 +9.2% Core 2 Quad Q9400 338Core 2 Duo E8400 outperforms Core 2 Quad Q9400 by 9% in GeekBench 5 Single-Core. GeekBench 5 Multi-CoreGeekBench 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. Benchmark coverage: 42% Core 2 Duo E8400 612 Core 2 Quad Q9400 936 +52.9%Core 2 Quad Q9400 outperforms Core 2 Duo E8400 by 53% in GeekBench 5 Multi-Core. 3DMark Fire Strike PhysicsBenchmark coverage: 4% Core 2 Duo E8400 2370 Core 2 Quad Q9400 4280 +80.6%Core 2 Quad Q9400 outperforms Core 2 Duo E8400 by 81% in 3DMark Fire Strike Physics. Gaming performance Pros & cons summary Performance score 0.75 1.37 Physical cores 2 4 Threads 2 4 Power consumption (TDP) 65 Watt 95 WattThe Core 2 Quad Q9400 is our recommended choice as it beats the Core 2 Duo E8400 in performance tests. Should you still have questions on choice between Core 2 Duo E8400 and Core 2 Quad Q9400, ask them in Comments section, and we shall answer. Vote for your favoriteDo you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU. Core 2 Duo E8400 Core 2 Quad Q9400 Like Like Similar processor comparisonsWe picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page. 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