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GeForce 8400 GS 512MB vs Radeon HD 5450

Intro

The GeForce 8400 GS 512MB features a core clock speed of 650 MHz and a DDR2 memory speed of 400 MHz. It also uses a 64-bit bus, and uses a 80 nm design. It is made up of 16 SPUs, 8 TAUs, and 4 ROPs.

Compare those specifications to the Radeon HD 5450, which makes use of a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 RAM is set to run at a speed of 800 MHz on this model. It features 80(16x5) SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
GeForce 8400 GS 512MB 40 Watts
Difference: 21 Watts (111%)

Memory Bandwidth

Theoretically, the Radeon HD 5450 should perform much faster than the GeForce 8400 GS 512MB overall. (explain)

Radeon HD 5450 12800 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 6400 (100%)

Texel Rate

Both cards have the exact same texel rate, so theoretically they should be equally good at at AF. (explain)

Pixel Rate

Both cards have exactly the same pixel fill rate, so theoretically they should perform equally good at at anti-aliasing, and be capable of handling the same resolutions. (explain)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce 8400 GS 512MB

Radeon HD 5450

Specifications

Display Specifications

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Model GeForce 8400 GS 512MB Radeon HD 5450
Manufacturer nVidia AMD
Year June 2007 February 4, 2010
Code Name G86 Cedar PRO
Memory 512 MB 512 MB
Core Speed 650 MHz 650 MHz
Memory Speed 800 MHz 1600 MHz
Power (Max TDP) 40 watts 19 watts
Bandwidth 6400 MB/sec 12800 MB/sec
Texel Rate 5200 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 16 80(16x5)
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR2 DDR3
Bus Width 64-bit 64-bit
Fab Process 80 nm 40 nm
Transistors 210 million 292 million
Bus PCIe x16, PCI PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce 8400 GS 512MB

Radeon HD 5450

Comments

One Response to “GeForce 8400 GS 512MB vs Radeon HD 5450”
Need a DDR2 Graphic card for Dual monitor -Not gaming-Stock charts - Digit Technology Discussion Forum says:

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