Radeon HD 5770 vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core speed at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this particular card. It features 1024 SPUs as well as 64 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 7850		130 Watts
	Difference: 22 Watts (20%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should in theory be quite a bit superior to the Radeon HD 5770 in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 76800 (100%)

Texel Rate

The Radeon HD 7850 is much (approximately 62%) better at AF than the Radeon HD 5770. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 21040 (62%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7850 is the winner, by a large margin. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 13920 (102%)

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 (measured in MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video 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 amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.