Radeon HD 4850 2GB vs Radeon HD 5770

Intro

Compare those specs to the Radeon HD 5770, which features a core clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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

In theory, the Radeon HD 5770 should be a lot faster than the Radeon HD 4850 2GB overall. (explain)

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

Texel Rate

The Radeon HD 5770 should be quite a bit (about 36%) faster with regards to texture 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

The Radeon HD 5770 is quite a bit (more or less 36%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 2GB, and able to handle higher resolutions more effectively. (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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can 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 ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.