Radeon HD 4850 512MB vs Radeon HD 5750 512MB

Intro

Compare those specs to the Radeon HD 5750 512MB, which uses a 40 nm design. AMD has set the core frequency at 700 MHz. The GDDR5 memory runs at a speed of 1150 MHz on this card. It features 720(144x5) SPUs as well as 36 Texture Address Units and 16 Rasterization Operator 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

Theoretically speaking, the Radeon HD 5750 512MB will be 16% faster than the Radeon HD 4850 512MB overall, due to its higher data rate. (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 will be a small bit (about 1%) faster with regards to anisotropic 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 the winner, but only just. (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 MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, 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 that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.