Radeon HD 4670 512MB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which features core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 7990		375 Watts
	Difference: 305 Watts (436%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform much faster than the Radeon HD 4670 512MB in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 544000 (1700%)

Texel Rate

The Radeon HD 7990 will be much (about 913%) better at AF than the Radeon HD 4670 512MB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 219200 (913%)

Pixel Rate

The Radeon HD 7990 is much (about 913%) faster with regards to full screen anti-aliasing than the Radeon HD 4670 512MB, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 54800 (913%)

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 maximum amount of data (measured in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.