Radeon HD 5670 vs Radeon HD 6790

Intro

Compare those specs to the Radeon HD 6790, which features clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 6790		150 Watts
	Difference: 89 Watts (146%)

Memory Bandwidth

In theory, the Radeon HD 6790 should perform much faster than the Radeon HD 5670 overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 70400 (110%)

Texel Rate

The Radeon HD 6790 should be a lot (about 117%) more effective at texture filtering than the Radeon HD 5670. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 18100 (117%)

Pixel Rate

The Radeon HD 6790 is a lot (approximately 117%) better at FSAA than the Radeon HD 5670, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 7240 (117%)

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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 are processed in one second. This figure is calculated by multiplying the total number of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. 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 - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.