Radeon HD 4850 512MB vs Radeon HD 5750 512MB

Intro

Compare all that to the Radeon HD 5750 512MB, which has GPU core speed of 700 MHz, and 512 MB of GDDR5 memory running at 1150 MHz through a 128-bit bus. It also is comprised of 720(144x5) SPUs, 36 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 5750 512MB		86 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 24 Watts (28%)

Memory Bandwidth

The Radeon HD 5750 512MB should theoretically perform a little bit faster than the Radeon HD 4850 512MB overall. (explain)

Radeon HD 5750 512MB		73600 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 5750 512MB is a bit (about 1%) faster with regards to texture filtering than the Radeon HD 4850 512MB. (explain)

Radeon HD 5750 512MB		25200 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 200 (1%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5750 512MB is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 5750 512MB		11200 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 1200 (12%)

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 (measured in MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends 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.