Radeon HD 4670 1GB vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which features a clock frequency of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is made up of 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 6990		375 Watts
	Difference: 305 Watts (436%)

Memory Bandwidth

Performance-wise, the Radeon HD 6990 should theoretically be much better than the Radeon HD 4670 1GB overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 284800 (809%)

Texel Rate

The Radeon HD 6990 should be much (about 564%) better at AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 135360 (564%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 47120 (785%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the 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 number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics 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 maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.