Radeon HD 4770 vs Radeon HD 5830

Intro

Compare those specs to the Radeon HD 5830, which has a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 256-bit bus. It also is made up of 1120(224x5) SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 5830		175 Watts
	Difference: 95 Watts (119%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5830 will be 150% quicker than the Radeon HD 4770 overall, because of its greater bandwidth. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 76800 (150%)

Texel Rate

The Radeon HD 5830 will be much (about 87%) more effective at AF than the Radeon HD 4770. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 20800 (87%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 5830 is the winner, but not by far. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 800 (7%)

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 largest amount of information (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.