GeForce 8400 GS 512MB vs Radeon HD 5670

Intro

Compare all that to the Radeon HD 5670, which features core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 400(80x5) SPUs along with 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

In theory, the Radeon HD 5670 should be 900% quicker than the GeForce 8400 GS 512MB in general, because of its higher data rate. (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 much (more or less 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 using a high screen resolution is important to you, then the Radeon HD 5670 is the winner, and very much so. (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 largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock 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 number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few 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.