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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 works at a speed of 400 MHz on this specific model. It features 16 SPUs along with 8 Texture Address Units and 4 ROPs.

Compare those specifications to the Radeon HD 5450, which has GPU clock speed of 650 MHz, and 512 MB of DDR3 RAM set to run at 800 MHz through a 64-bit bus. It also is comprised of 80(16x5) Stream Processors, 8 Texture Address Units, and 4 ROPs.

(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

Theoretically speaking, the Radeon HD 5450 should perform quite a bit 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 exactly the same texel fill rate, so theoretically they should be equally good at at anisotropic filtering. (explain)

Pixel Rate

Both cards have exactly the same pixel fill rate, so theoretically they should be equally good at at FSAA, and be able to handle 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 max amount of data (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the 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 record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many 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.

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