GeForce 8400 GS 512MB vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which comes with a clock speed of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It features 400(80x5) SPUs, 20 TAUs, and 8 Raster Operation 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

Theoretically, 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 is quite a bit (about 198%) more effective at AF 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

The Radeon HD 5670 will be a lot (more or less 138%) faster with regards to full screen anti-aliasing than the GeForce 8400 GS 512MB, and also will be able to handle higher screen resolutions without slowing down too much. (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 maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 applied per second. This number is worked out by multiplying the total number of texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.