Radeon HD 4670 512MB vs Radeon HD 6790

Intro

Compare those specs to the Radeon HD 6790, which features a clock frequency of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It features 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 6790		150 Watts
	Difference: 80 Watts (114%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6790 should in theory be a lot better than the Radeon HD 4670 512MB in general. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 102400 (320%)

Texel Rate

The Radeon HD 6790 should be a lot (about 40%) better at texture filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 9600 (40%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6790 is superior to the Radeon HD 4670 512MB, by far. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 7440 (124%)

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 max amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.