Radeon HD 4830 1GB vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which features GPU clock speed of 800 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 40 Watts (73%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7750 should in theory be a lot better than the Radeon HD 4830 1GB in general. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon HD 7750 should be quite a bit (more or less 39%) better at texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 7200 (39%)

Pixel Rate

The Radeon HD 7750 will be a lot (more or less 39%) faster with regards to anti-aliasing than the Radeon HD 4830 1GB, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 3600 (39%)

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 (counted in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.