Intel Core i5-14400T vs Intel Core i3-8121U

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CPU comparison with benchmarks


Intel Core i5-14400T CPU1 vs CPU2 Intel Core i3-8121U
Intel Core i5-14400T Intel Core i3-8121U

CPU comparison

Intel Core i5-14400T or Intel Core i3-8121U - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results.

The Intel Core i5-14400T has 10 cores with 16 threads and clocks with a maximum frequency of 4.50 GHz. Up to 192 GB of memory is supported in 2 memory channels. The Intel Core i5-14400T was released in Q1/2024.

The Intel Core i3-8121U has 2 cores with 4 threads and clocks with a maximum frequency of 3.20 GHz. The CPU supports up to 32 GB of memory in 2 memory channels. The Intel Core i3-8121U was released in Q2/2018.
Intel Core i5 (331) Family Intel Core i3 (205)
Intel Core i 14000 (23) CPU group Intel Core i 8000U (CL) (1)
14 Generation 8
Raptor Lake S Refresh Architecture Cannon Lake U
Desktop / Server Segment Mobile
Intel Core i5-13400T Predecessor --
-- Successor --

CPU Cores and Base Frequency

The Intel Core i5-14400T is a 10 core processor with a clock frequency of 1.50 GHz (4.50 GHz). The Intel Core i3-8121U has 2 CPU cores with a clock frequency of 2.20 GHz (3.20 GHz).
Intel Core i5-14400T Characteristic Intel Core i3-8121U
10 Cores 2
16 Threads 4
hybrid (big.LITTLE) Core architecture normal
Yes Hyperthreading Yes
No Overclocking ? No
1.50 GHz (4.50 GHz)
6x Raptor Cove		 A-Core 2.20 GHz (3.20 GHz)
1.10 GHz (3.20 GHz)
4x Gracemont		 B-Core --

Artificial Intelligence and Machine Learning

Processors with the support of artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors. Algorithms for ML improve their performance the more data they have collected via software. ML tasks can be processed up to 10,000 times faster than with a classic processor.
Intel Core i5-14400T Characteristic Intel Core i3-8121U
-- AI hardware --
-- AI specifications --

Internal Graphics

The integrated graphics unit of a processor is not only responsible for the pure image output on the system, but can also significantly increase the efficiency of the system with the support of modern video codecs.
Intel UHD Graphics 730 GPU no iGPU
0.30 GHz GPU frequency --
1.55 GHz GPU (Turbo) --
12 GPU Generation --
14 nm Technology
3 Max. displays
24 Compute units --
192 Shader --
No Hardware Raytracing No
No Frame Generation No
64 GB Max. GPU Memory --
12 DirectX Version --

Hardware codec support

A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.
Intel UHD Graphics 730 GPU no iGPU
Decode / Encode Codec h265 / HEVC (8 bit) No
Decode / Encode Codec h265 / HEVC (10 bit) No
Decode / Encode Codec h264 No
Decode / Encode Codec VP9 No
Decode / Encode Codec VP8 No
Decode Codec AV1 No
Decode / Encode Codec AVC No
Decode Codec VC-1 No
Decode / Encode Codec JPEG No

Memory & PCIe

The Intel Core i5-14400T supports a maximum of 192 GB of memory in 2 memory channels. The Intel Core i3-8121U can connect up to 32 GB of memory in 2 memory channels.
Intel Core i5-14400T Characteristic Intel Core i3-8121U
DDR5-4800, DDR4-3200 Memory LPDDR4-2400, DDR4-2400
192 GB Max. Memory 32 GB
2 (Dual Channel) Memory channels 2 (Dual Channel)
76.8 GB/s Max. Bandwidth 38.4 GB/s
No ECC No
9.50 MB L2 Cache --
20.00 MB L3 Cache 4.00 MB
5.0 PCIe version 3.0
20 PCIe lanes 16
78.8 GB/s PCIe Bandwidth 15.8 GB/s

Thermal Management

The TDP (Thermal Design Power) of a processor specifies the required cooling solution. The Intel Core i5-14400T has a TDP of 35 W, that of the Intel Core i3-8121U is 15 W.
Intel Core i5-14400T Characteristic Intel Core i3-8121U
35 W TDP (PL1 / PBP) 15 W
82 W TDP (PL2) --
-- TDP up --
-- TDP down --
100 °C Tjunction max. 105 °C

Technical details

The Intel Core i5-14400T has a 29.50 MB cache, while the Intel Core i3-8121U cache has a total of 4.00 MB.
Intel Core i5-14400T Characteristic Intel Core i3-8121U
10 nm Technology 10 nm
Monolithic Chip design Monolithic
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
SSE4.1, SSE4.2, AVX2, AVX2+ ISA extensions SSE4.1, SSE4.2, AVX2, AVX-512
LGA 1700 Socket BGA 1356
VT-x, VT-x EPT, VT-d Virtualization VT-x, VT-x EPT, VT-d
Yes AES-NI Yes
Windows 10, Windows 11, Linux Operating systems Windows 10, Windows 11, Linux
Q1/2024 Release date Q2/2018
-- Release price --
show more data show more data


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Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 4.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 3.20 GHz
810 (100%)

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 1.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 2.70 GHz
1987 (100%)

Geekbench 6 (Single-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The single-core benchmark only evaluates the performance of the fastest CPU core, the number of CPU cores in a processor is irrelevant here.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 4.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 3.20 GHz
1114 (100%)

Geekbench 6 (Multi-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The multi-core benchmark evaluates the performance of all of the processor's CPU cores. Virtual thread improvements such as AMD SMT or Intel's Hyper-Threading have a positive impact on the benchmark result.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 1.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 2.70 GHz
2414 (100%)

iGPU - FP32 Performance (Single-precision GFLOPS)

The theoretical computing performance of the internal graphics unit of the processor with simple accuracy (32 bit) in GFLOPS. GFLOPS indicates how many billion floating point operations the iGPU can perform per second.
Intel Core i5-14400T Intel Core i5-14400T
Intel UHD Graphics 730 @ 1.55 GHz
595 (100%)
Intel Core i3-8121U Intel Core i3-8121U
@ 0.00 GHz
0 (0%)

Estimated results for PassMark CPU Mark

Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 1.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 2.70 GHz
4395 (100%)

Cinebench R15 (Single-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 4.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 3.20 GHz
139 (100%)

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
Intel Core i5-14400T Intel Core i5-14400T
10C 16T @ 1.50 GHz
0 (0%)
Intel Core i3-8121U Intel Core i3-8121U
2C 4T @ 2.70 GHz
305 (100%)

Devices using this processor
Intel Core i5-14400T Intel Core i3-8121U
Unknown Unknown

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