Radeon HD 4850 1GB vs Radeon HD 5750 512MB

Intro

Compare that to the Radeon HD 5750 512MB, which comes with a core clock frequency of 700 MHz and a GDDR5 memory speed of 1150 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 720(144x5) SPUs, 36 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 24 Watts (28%)

Memory Bandwidth

The Radeon HD 5750 512MB should theoretically be a little bit faster than the Radeon HD 4850 1GB overall. (explain)

Radeon HD 5750 512MB		73600 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 5750 512MB will be a little bit (more or less 1%) faster with regards to AF than the Radeon HD 4850 1GB. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5750 512MB is the winner, though only just barely. (explain)

Radeon HD 5750 512MB		11200 Mpixels/sec
Radeon HD 4850 1GB		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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount 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 one second.

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