GeForce 8400 GS 512MB vs Radeon HD 5670

Intro

Compare that to the Radeon HD 5670, which has clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon HD 5670		61 Watts
	Difference: 21 Watts (53%)

Memory Bandwidth

Performance-wise, the Radeon HD 5670 should in theory be much superior to the GeForce 8400 GS 512MB in general. (explain)

Radeon HD 5670		64000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57600 (900%)

Texel Rate

The Radeon HD 5670 is much (about 198%) better at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 5670		15500 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 10300 (198%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 5670 is a better choice, by far. (explain)

Radeon HD 5670		6200 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 3600 (138%)

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

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.