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Gaming Performance Comparison

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 8670M are significantly better than the AMD Radeon HD 8400.

The Radeon HD 8670M has a 175 MHz higher core clock speed and 16 more Texture Mapping Units than the Radeon HD 8400. This results in the Radeon HD 8670M providing 13.8 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 Radeon HD 8670M has a 175 MHz higher core clock speed and 4 more Render Output Units than the Radeon HD 8400. This results in the Radeon HD 8670M providing 3.8 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 less than a year after the Radeon HD 8670M, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The Radeon HD 8670M has 1024 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 Radeon HD 8670M has 384. However, the actual shader performance of the Radeon HD 8400 is 50 and the actual shader performance of the Radeon HD 8670M is 285. The Radeon HD 8670M having 235 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon HD 8670M delivers a marginally smoother and more efficient experience when processing graphical data than the Radeon HD 8400.

The Radeon HD 8400 requires 25 Watts to run but there is no entry for the Radeon HD 8670M.

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GPU Core Details

Core Speed600 MHzvs775 MHz
ArchitectureKalindiGCN 1.1 Mars XT
Notebook GPUyesyes
SLI/Crossfirenovsno
Dedicatednovsyes
Release Date23 May 201301 Mar 2013
GPU LinkGD LinkGD Link
Approved
Comparison

GPU Memory

Memory-vs1024 MB
Memory Speed800 MHzvs900 MHz
Memory Bus128 Bitvs64 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth25.6GB/secvs14.4GB/sec
L2 Cache - vs green tick 256 KB
Comparison

GPU Display

Shader Processing Units128vs384
Actual Shader Performance50vs285
Technology28nmvs28nm
Texture Mapping Units8vs24
Texture Rate4.8 GTexel/svs18.6 GTexel/s
Render Output Units4vs8
Pixel Rate2.4 GPixel/svs6.2 GPixel/s
Comparison

GPU Display Tech

DirectX11.1vs11.1
Shader Model5.0vs5.0
Open GL4.3vs4.2
Max Resolution (WxH)-vs2560x1600
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
Comparison

GPU Power Requirements

Max Power25 Watts-

GPU Supporting Hardware

Recommended RAM-4 GB
Recommended Screen Size-1366x768
Recommended PSU--

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.
Radeon HD 8670M is a middle-class Graphics Card based on the GCN architecture.
It features the Mars XT GPU and thus offers 384 Shader Processing Units, 24 TMUs and 8 ROPs. The central unit can be initially clocked at up to 775MHz reach up to 825MHz in Turbo Mode while the memory interface is of 64-bit of standard DDR3.
It can be addressed as a fast Radeon HD 8550M due to its considerably higher core-clock speed.
Benchmarks indicate its performance is somewhat above NVIDIA's GeForce GT 630M and thus the card can run most modern games at medium games.
Recommended CPU--
Possible GPU Upgrades--
GPU Variants--