Intel Core 2 Quad Q8400 vs Intel Atom Z3775D

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CPU comparison with benchmarks


Intel Core 2 Quad Q8400 CPU1 vs CPU2 Intel Atom Z3775D
Intel Core 2 Quad Q8400 Intel Atom Z3775D

CPU comparison

In this CPU comparison, we compare the Intel Core 2 Quad Q8400 and the Intel Atom Z3775D and use benchmarks to check which processor is faster.

We compare the Intel Core 2 Quad Q8400 4 core processor released in Q2/2009 with the Intel Atom Z3775D which has 4 CPU cores and was introduced in Q1/2014.
Intel Core2 Quad (19) Family Intel Atom (108)
Intel Core 2 Quad Q8000/Q9000 (16) CPU group Intel Atom Z3700 (16)
2 Generation 4
Yorkfield (Penryn) Architecture Bay Trail
Desktop / Server Segment Mobile
-- Predecessor --
-- Successor --

CPU Cores and Base Frequency

The Intel Core 2 Quad Q8400 is a 4 core processor with a clock frequency of 2.66 GHz. The processor can compute 4 threads at the same time. The Intel Atom Z3775D clocks with 1.49 GHz (2.41 GHz), has 4 CPU cores and can calculate 4 threads in parallel.

Intel Core 2 Quad Q8400 Characteristic Intel Atom Z3775D
4 Cores 4
4 Threads 4
normal Core architecture normal
No Hyperthreading No
No Overclocking ? No
2.66 GHz Frequency 1.49 GHz
-- Turbo Frequency (1 Core) 2.41 GHz
-- Turbo Frequency (All Cores) --

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 2 Quad Q8400 Characteristic Intel Atom Z3775D
-- AI hardware --
-- AI specifications --

Internal Graphics

Graphics (iGPU) integrated into the processor not only enable image output without having to rely on a dedicated graphics solution, but can also efficiently accelerate video playback.

no iGPU GPU Intel HD Graphics (Bay Trail GT1)
GPU frequency 0.31 GHz
-- GPU (Turbo) 0.79 GHz
-- GPU Generation 7
Technology 22 nm
Max. displays 2
-- Compute units 4
-- Shader 32
No Hardware Raytracing No
No Frame Generation No
-- Max. GPU Memory 2 GB
-- DirectX Version 11.2

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.

no iGPU GPU Intel HD Graphics (Bay Trail GT1)
No Codec h265 / HEVC (8 bit) No
No Codec h265 / HEVC (10 bit) No
No Codec h264 Decode / Encode
No Codec VP9 No
No Codec VP8 No
No Codec AV1 No
No Codec AVC Decode / Encode
No Codec VC-1 Decode
No Codec JPEG Decode

Memory & PCIe

Up to 16 GB of memory in a maximum of 2 memory channels is supported by the Intel Core 2 Quad Q8400, while the Intel Atom Z3775D supports a maximum of 2 GB of memory with a maximum memory bandwidth of 10.6 GB/s enabled.

Intel Core 2 Quad Q8400 Characteristic Intel Atom Z3775D
DDR3-1066, DDR2-800 Memory DDR3L-1333
16 GB Max. Memory 2 GB
2 (Dual Channel) Memory channels 1 (Single Channel)
17.1 GB/s Max. Bandwidth 10.6 GB/s
No ECC No
4.00 MB L2 Cache --
-- L3 Cache 2.00 MB
-- PCIe version --
-- PCIe lanes --
-- PCIe Bandwidth --

Thermal Management

The Intel Core 2 Quad Q8400 has a TDP of 95 W. The TDP of the Intel Atom Z3775D is 4 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

Intel Core 2 Quad Q8400 Characteristic Intel Atom Z3775D
95 W TDP (PL1 / PBP) 4 W
-- TDP (PL2) --
-- TDP up --
-- TDP down --
-- Tjunction max. 90 °C

Technical details

The Intel Core 2 Quad Q8400 has 4.00 MB cache and is manufactured in 45 nm. The cache of Intel Atom Z3775D is at 2.00 MB. The processor is manufactured in 22 nm.

Intel Core 2 Quad Q8400 Characteristic Intel Atom Z3775D
45 nm Technology 22 nm
Monolithic Chip design Monolithic
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
MMX, SSE2, SSE3, SSE4.1 ISA extensions SSE4.1, SSE4.2
LGA 775 Socket BGA 1380
VT-x, VT-d Virtualization VT-x, VT-x EPT
No AES-NI Yes
Windows 10, Linux Operating systems
Q2/2009 Release date Q1/2014
-- Release price 35 $
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Here you can rate the Intel Core 2 Quad Q8400 to help other visitors make their purchasing decisions. The average rating is 4.0 stars (1 ratings). Rate now:
Here you can rate the Intel Atom Z3775D to help other visitors make their purchasing decisions. The average rating is 0 stars (0 ratings). Rate now:


Average performance in benchmarks

⌀ Single core performance in 0 CPU benchmarks
Intel Core 2 Quad Q8400 (0%)
Intel Atom Z3775D (0%)
⌀ Multi core performance in 1 CPU benchmarks
Intel Core 2 Quad Q8400 (100%)
Intel Atom Z3775D (39%)

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 2 Quad Q8400 Intel Core 2 Quad Q8400
4C 4T @ 2.66 GHz
2029 (100%)
Intel Atom Z3775D Intel Atom Z3775D
4C 4T @ 1.49 GHz
794 (39%)

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 2 Quad Q8400 Intel Core 2 Quad Q8400
4C 4T @ 2.66 GHz
369 (100%)
Intel Atom Z3775D Intel Atom Z3775D
4C 4T @ 2.41 GHz
0 (0%)

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 2 Quad Q8400 Intel Core 2 Quad Q8400
4C 4T @ 2.66 GHz
1155 (100%)
Intel Atom Z3775D Intel Atom Z3775D
4C 4T @ 1.49 GHz
0 (0%)

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 2 Quad Q8400 Intel Core 2 Quad Q8400
@ 0.00 GHz
0 (0%)
Intel Atom Z3775D Intel Atom Z3775D
Intel HD Graphics (Bay Trail GT1) @ 0.79 GHz
51 (100%)

CPU-Z Benchmark 17 (Multi-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.
Intel Core 2 Quad Q8400 Intel Core 2 Quad Q8400
4C 4T @ 2.66 GHz
894 (100%)
Intel Atom Z3775D Intel Atom Z3775D
4C 4T @ 1.49 GHz
0 (0%)

Devices using this processor

Intel Core 2 Quad Q8400 Intel Atom Z3775D
Unknown Unknown

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