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GeForce 8400 GS 512MB vs Radeon HD 5450

Intro

The GeForce 8400 GS 512MB makes use of a 80 nm design. nVidia has set the core frequency at 650 MHz. The DDR2 RAM is set to run at a frequency of 400 MHz on this specific model. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

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

(No game benchmarks for this combination yet.)

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

In theory, the Radeon HD 5450 should perform much faster than the GeForce 8400 GS 512MB in general. (explain)

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

Texel Rate

Both cards have exactly the same texel fill rate, so in theory they should perform equally good at at AF. (explain)

Pixel Rate

Both cards have the exact same pixel fill rate, so in theory they should be equally good at at AA, and be capable of handling the same screen 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

Amazon.com

Radeon HD 5450

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model GeForce 8400 GS 512MB Radeon HD 5450
Manufacturer nVidia AMD
Year June 2007 February 4, 2010
Code Name G86 Cedar PRO
Fab Process 80 nm 40 nm
Bus PCIe x16, PCI PCIe 2.1 x16
Memory 512 MB 512 MB
Core Speed 650 MHz 650 MHz
Shader Speed 1100 MHz (N/A) MHz
Memory Speed 400 MHz (800 MHz effective) 800 MHz (1600 MHz effective)
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
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2
Power (Max TDP) 40 watts 19 watts
Shader Model 4.0 5.0
Bandwidth 6400 MB/sec 12800 MB/sec
Texel Rate 5200 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 2600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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