Radeon HD 3470 256MB vs Radeon HD 6750 1GB

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6750 1GB should in theory perform quite a bit faster than the Radeon HD 3470 256MB in general. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 3470 256MB		30400 MB/sec
	Difference: 33600 (111%)

Texel Rate

The Radeon HD 6750 1GB is quite a bit (more or less 716%) faster with regards to AF than the Radeon HD 3470 256MB. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 3470 256MB		3200 Mtexels/sec
	Difference: 22900 (716%)

Pixel Rate

The Radeon HD 6750 1GB should be quite a bit (about 263%) better at FSAA than the Radeon HD 3470 256MB, and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 3470 256MB		3200 Mpixels/sec
	Difference: 8400 (263%)

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 (counted in megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the 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 number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher 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 maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.