Radeon HD 4850 512MB vs Radeon HD 5750 512MB

Intro

Compare all that to the Radeon HD 5750 512MB, which has a clock frequency of 700 MHz and a GDDR5 memory frequency of 1150 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is made up of 720(144x5) SPUs, 36 TAUs, 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 in theory be a 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 should be a bit (approximately 1%) better at 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

The Radeon HD 5750 512MB will be a little bit (about 12%) faster with regards to AA than the Radeon HD 4850 512MB, and also capable of handling higher resolutions without slowing down too much. (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 largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.