Radeon HD 4850 512MB vs Radeon HD 6750 1GB

Intro

Compare those specs to the Radeon HD 6750 1GB, which comes with GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also is comprised of 720 SPUs, 36 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 24 Watts (28%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB should be just a bit faster than the Radeon HD 4850 512MB in general. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 448 (1%)

Texel Rate

The Radeon HD 6750 1GB is a bit (approximately 4%) faster with regards to AF than the Radeon HD 4850 512MB. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 1100 (4%)

Pixel Rate

The Radeon HD 6750 1GB is a bit (approximately 16%) faster with regards to FSAA than the Radeon HD 4850 512MB, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 1600 (16%)

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 information (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.