Radeon HD 5830 vs Radeon HD 6770 1GB

Intro

Compare those specifications to the Radeon HD 6770 1GB, which comes with a core clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon HD 5830		175 Watts
	Difference: 67 Watts (62%)

Memory Bandwidth

The Radeon HD 5830 should theoretically be much faster than the Radeon HD 6770 1GB overall. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 60800 (90%)

Texel Rate

The Radeon HD 5830 is quite a bit (approximately 24%) better at AF than the Radeon HD 6770 1GB. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 8800 (24%)

Pixel Rate

The Radeon HD 6770 1GB is a little bit (more or less 13%) more effective at anti-aliasing than the Radeon HD 5830, and also will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5830		12800 Mpixels/sec
	Difference: 1600 (13%)

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 (in units of MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.