Radeon HD 4850 512MB vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which features clock speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 720 SPUs as well as 36 Texture Address Units and 16 Rasterization Operator 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

As far as performance goes, the Radeon HD 6750 1GB should in theory be a small bit better 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 little bit (more or less 4%) faster with regards to anisotropic filtering 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 small bit (more or less 16%) more effective at anti-aliasing than the Radeon HD 4850 512MB, and also should be capable of handling 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 largest amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video 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 most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs 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 also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.