Core i9-11900KF vs Core 2 Duo E8400

Place in the ranking	2664	422
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	1.07	11.92
Architecture codename	Wolfdale (2008−2010)	Rocket Lake (2021)
Release date	1 January 2008 (16 years ago)	16 March 2021 (3 years ago)

Detailed specifications

Core 2 Duo E8400 and Core i9-11900KF 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)	8 (Octa-Core)
Threads	2	16
Base clock speed	3 GHz	3.5 GHz
Boost clock speed	3 GHz	5.2 GHz
Bus rate	1333 MHz	8 GT/s
L1 cache	64 KB (per core)	64K (per core)
L2 cache	6 MB (shared)	256K (per core)
L3 cache	0 KB	16 MB (shared)
Chip lithography	45 nm	14 nm
Die size	104 mm²	no data
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	72 °C	72 °C
Number of transistors	410 million	no data
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	-	+
VID voltage range	0.85V-1.3625V	no data

Compatibility

Information on Core 2 Duo E8400 and Core i9-11900KF 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	1	1
Socket	LGA775	FCLGA1200
Power consumption (TDP)	65 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo E8400 and Core i9-11900KF. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512
AES-NI	-	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	2.0
Hyper-Threading Technology	-	+
TSX	-	+
Idle States	+	+
Thermal Monitoring	+	+
Demand Based Switching	-	no data
Turbo Boost Max 3.0	no data	+
FSB parity	-	no data
Deep Learning Boost	-	+

Security technologies

Core 2 Duo E8400 and Core i9-11900KF technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	no data	+
Identity Protection	-	+
SGX	no data	-
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Duo E8400 and Core i9-11900KF are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Duo E8400 and Core i9-11900KF. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR4-3200
Maximum memory size	no data	128 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	50 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

On certain motherboards (Chipset feature)

no data

Peripherals

Specifications and connection of peripherals supported by Core 2 Duo E8400 and Core i9-11900KF.

PCIe version	2.0	4.0
PCI Express lanes	no data	20

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 Duo E8400 0.76

i9-11900KF 16.34
+2050%

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 Duo E8400 1165

i9-11900KF 25006
+2046%

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 Duo E8400 370

i9-11900KF 2329
+529%

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 Duo E8400 603

i9-11900KF 10058
+1568%

Gaming performance

Pros & cons summary

Performance score	0.76	16.34
Recency	1 January 2008	16 March 2021
Physical cores	2	8
Threads	2	16
Chip lithography	45 nm	14 nm
Power consumption (TDP)	65 Watt	125 Watt

Core 2 Duo E8400 has 92.3% lower power consumption.

i9-11900KF, on the other hand, has a 2050% higher aggregate performance score, an age advantage of 13 years, 300% more physical cores and 700% more threads, and a 221.4% more advanced lithography process.

The Core i9-11900KF 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 i9-11900KF, ask them in Comments section, and we shall answer.