Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Radeon HD 8400 GeForce GTX 660M
Halo: Reach 510% 70%
Cyberpunk 2077 2539% 635%
Red Dead Redemption 2 1821% 435%
Dragon Ball Z Kakarot 1085% 230%
Call of Duty: Modern Warfare 1821% 435%
Microsoft Flight Simulator 2539% 635%
Doom Eternal 1552% 360%
Grand Theft Auto VI 2835% 718%
FIFA 20 923% 185%
Need For Speed Heat 1821% 435%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 660M are massively better than the AMD Radeon HD 8400.

The GeForce GTX 660M has a 235 MHz higher core clock speed and 24 more Texture Mapping Units than the Radeon HD 8400. This results in the GeForce GTX 660M providing 21.9 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GeForce GTX 660M has a 235 MHz higher core clock speed and 12 more Render Output Units than the Radeon HD 8400. This results in the GeForce GTX 660M providing 11 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The Radeon HD 8400 was released over a year more recently than the GeForce GTX 660M, and so the Radeon HD 8400 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce GTX 660M.

The GeForce GTX 660M has 2048 MB video memory, but the Radeon HD 8400 does not have an entry, so the two GPUs cannot be reliably compared in this area.

The Radeon HD 8400 has 128 Shader Processing Units and the GeForce GTX 660M has 384. However, the actual shader performance of the Radeon HD 8400 is 50 and the actual shader performance of the GeForce GTX 660M is 365. The GeForce GTX 660M having 315 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce GTX 660M delivers a significantly smoother and more efficient experience when processing graphical data than the Radeon HD 8400.

The Radeon HD 8400 requires 25 Watts to run and the GeForce GTX 660M requires 50 Watts. The GeForce GTX 660M requires 25 Watts more than the Radeon HD 8400 to run. The difference is not significant enough for the GeForce GTX 660M to have a noticeably larger impact on your yearly electricity bills than the Radeon HD 8400.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed600 MHzvs835 MHz
Boost Clock-vs950 MHz
ArchitectureKalindiKepler GK107-N13E-GE-A2
OC Potential - vs Poor
Driver Support - vs Good
Release Date23 May 2013vs22 Mar 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - vs green tick
7.9
1600x900 - vs green tick
5.9
1920x1080 - vs green tick
4.4
2560x1440 - vs green tick
2.8
3840x2160 - vs green tick
1.8

GPU Memory

MemoryN/Avs2048 MB
Memory Speed800 MHzvs1000 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth25.6GB/secvs64GB/sec
L2 Cache - vs green tick 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units128vs384
Actual Shader Performance2%vs18%
Technology28nmvs28nm
Texture Mapping Units8vs32
Texture Rate4.8 GTexel/svs26.7 GTexel/s
Render Output Units4vs16
Pixel Rate2.4 GPixel/svs13.4 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)-vs4096x2160
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power25 Wattsvs50 Watts
Recommended PSU--

GPU Features

DirectX11.1vs12.0
Shader Model5.0vs5.0
Open GL4.3vs4.5
Open CL-vs-
Notebook GPUyesyes
SLI/Crossfirenovsyes
Dedicatednovsyes
Comparison

GPU Supporting Hardware

Recommended Processor-Intel Core i5-3360M 2.8GHz
Recommended RAM-8 GB
Maximum Recommended Gaming Resolution-1600x900

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon HD 8400 is an integrated graphics card on some of the Kabini APUs.
It is based on the Graphics Core Next Architecture and shares the main system memory of up to 800MHz, on a 128-bit memory interface, whereas the memory bandwidth and performance will depend heavily on the laptop configuration.
The codenamed Kalindi Core offers 128 Shader Processing Units, 8 TMUs and 4 ROPs.
Assuming the best combination possible, expect performance similar to an Intel HD 4000 and never below an Intel HD 3000. Thus, the card is only suited for modest 3D games and titles like BF4, AC4 and CoD: Ghosts are unplayable.
Overview
GeForce GTX 660M is a Fast-Middle-Class Mobile Graphics Card based on the first revision of the Kepler Architecture.

Architecture
The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.

GPU
It equips a GPU Codenamed GK107-N13E-GE-A2 which has 2 Stream Multiprocessors activated and thus offers 384 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is initially clocked at 835MHz and goes up to 950MHz, in Turbo Mode.

Memory
The GPU accesses a 2GB frame buffer of fast GDDR5, through a 128-bit memory interface. The size of the frame buffer is exaggerated and no way benefits the GPU. The Memory Clock Operates at 1000MHz.

Features
DirectX 11.0 Support (11.0 Hardware Default) and support for SLI, Kepler Boost, Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies

Power Consumption
With a rated board TDP of 45W, it is suited for average sized laptops.

Performance
Gaming benchmarks indicate its performance is not too far from the desktop GeForce GTX 650.

System Suggestions
We recommend a decent processor (Intel Core i5 Mobile) and 8GB of RAM for a system with GeForce GTX 660M.
Recommended CPU
-
Possible GPU Upgrades
N/A
N/A
GPU Variants
-
-

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