Radeon HD 4830 512MB vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which features clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 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 7750		55 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 40 Watts (73%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 will be 25% quicker than the Radeon HD 4830 512MB in general, due to its higher bandwidth. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon HD 7750 is much (about 39%) better at AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 7200 (39%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7750 is a better choice, by a large margin. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4830 512MB		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: Bandwidth is the max amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses 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 texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core 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 a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.