Radeon HD 4730 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 memory. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4730		140 Watts
Radeon HD 6790		150 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

The Radeon HD 6790 should theoretically perform a lot faster than the Radeon HD 4730 overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 76800 (133%)

Texel Rate

The Radeon HD 6790 will be much (more or less 50%) more effective at anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 11200 (50%)

Pixel Rate

The Radeon HD 6790 should be much (more or less 140%) better at FSAA than the Radeon HD 4730, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 7840 (140%)

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 information (counted in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.