Radeon HD 4750 vs Radeon HD 4830 512MB

Intro

Compare those specifications to the Radeon HD 4830 512MB, which features GPU clock speed of 575 MHz, and 512 MB of GDDR3 RAM running at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 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 512MB		95 Watts
	Difference: 20 Watts (27%)

Memory Bandwidth

The Radeon HD 4830 512MB should in theory be a bit faster than the Radeon HD 4750 in general. (explain)

Radeon HD 4830 512MB		57600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The Radeon HD 4750 should be much (more or less 27%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 4960 (27%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4750 is superior to the Radeon HD 4830 512MB, by far. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 4830 512MB		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: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.