Radeon HD 4890 1GB vs Radeon HD 6750

Intro

Compare that to the Radeon HD 6750, which features core speeds of 725 MHz on the GPU, and 1000 MHz on the 512 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		86 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 104 Watts (121%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 1GB is 95% faster than the Radeon HD 6750 overall, because of its greater data rate. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 60800 (95%)

Texel Rate

The Radeon HD 4890 1GB is much (more or less 53%) faster with regards to AF than the Radeon HD 6750. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 13900 (53%)

Pixel Rate

The Radeon HD 4890 1GB will be quite a bit (more or less 38%) faster with regards to AA than the Radeon HD 6750, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 4400 (38%)

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 max amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.