Radeon HD 4850 2GB vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which comes with GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 128-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

Theoretically, the Radeon HD 5770 should perform much faster than the Radeon HD 4850 2GB in general. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 13248 (21%)

Texel Rate

The Radeon HD 5770 will be much (more or less 36%) better at anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 9000 (36%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5770 is superior to the Radeon HD 4850 2GB, by far. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 3600 (36%)

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 moved past the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.