GeForce 8400 GS 512MB vs Radeon HD 6750

Intro

Compare all that to the Radeon HD 6750, which makes use of a 40 nm design. AMD has set the core speed at 725 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this model. It features 720 SPUs as well as 36 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Radeon HD 6750		86 Watts
	Difference: 46 Watts (115%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6750 should in theory be quite a bit superior to the GeForce 8400 GS 512MB overall. (explain)

Radeon HD 6750		64000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 57600 (900%)

Texel Rate

The Radeon HD 6750 will be a lot (more or less 402%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 20900 (402%)

Pixel Rate

The Radeon HD 6750 will be much (approximately 346%) more effective at full screen anti-aliasing than the GeForce 8400 GS 512MB, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6750		11600 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 9000 (346%)

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 maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 ability to get to the max fill rate.