Radeon HD 4670 512MB vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also features 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 7790		85 Watts
	Difference: 15 Watts (21%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7790 should theoretically be quite a bit superior to the Radeon HD 4670 512MB in general. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 64000 (200%)

Texel Rate

The Radeon HD 7790 will be much (approximately 133%) better at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 32000 (133%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7790 is the winner, and very much so. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 10000 (167%)

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 maximum amount of data (in units of MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's 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 number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.