Radeon HD 4850 2GB vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

The Radeon HD 7770, in theory, should be a little bit faster than the Radeon HD 4850 2GB overall. (explain)

Radeon HD 7770		72000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 8448 (13%)

Texel Rate

The Radeon HD 7770 is much (more or less 60%) faster with regards to anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 15000 (60%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7770 is superior to the Radeon HD 4850 2GB, by far. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 6000 (60%)

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 (counted in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, 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 worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.