Radeon HD 4850 512MB vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which features core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

In theory, the Radeon HD 5770 is 21% quicker than the Radeon HD 4850 512MB in general, because of its higher bandwidth. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 13248 (21%)

Texel Rate

The Radeon HD 5770 is much (about 36%) faster with regards to anisotropic filtering than the Radeon HD 4850 512MB. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 9000 (36%)

Pixel Rate

The Radeon HD 5770 will be much (more or less 36%) better at FSAA than the Radeon HD 4850 512MB, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 4850 512MB		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 largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of 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 ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.