Radeon HD 4750 vs Radeon HD 4830 1GB

Intro

Compare all of that to the Radeon HD 4830 1GB, which uses a 55 nm design. AMD has set the core speed at 575 MHz. The GDDR4 memory is set to run at a frequency of 900 MHz on this particular model. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 20 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 4830 1GB should perform a small bit faster than the Radeon HD 4750 in general. (explain)

Radeon HD 4830 1GB		57600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The Radeon HD 4750 will be much (about 27%) better at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 4960 (27%)

Pixel Rate

The Radeon HD 4750 is a lot (more or less 27%) better at anti-aliasing than the Radeon HD 4830 1GB, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 2480 (27%)

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 max amount of information (counted in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number 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 the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.