GeForce 8400 GS 512MB vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which features clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 400(80x5) SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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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

In theory, the Radeon HD 5670 should perform a lot faster than the GeForce 8400 GS 512MB overall. (explain)

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

Texel Rate

The Radeon HD 5670 will be a lot (approximately 198%) better at texture 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 using high levels of AA 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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 can be applied in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.