Radeon HD 4750 vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which has GPU core speed of 575 MHz, and 1024 MB of GDDR4 memory running at 900 MHz through a 256-bit bus. It also is comprised of 640(128x5) Stream Processors, 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 4750		75 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 20 Watts (27%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 1GB should theoretically be a little bit better than the Radeon HD 4750 overall. (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 (approximately 27%) better at AF 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

If using a high screen resolution is important to you, then the Radeon HD 4750 is a better choice, by far. (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 maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 applied per second. This is calculated by multiplying the total number of texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.