Radeon HD 4350 vs Radeon HD 6790

Intro

Compare those specs to the Radeon HD 6790, which uses a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this specific model. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4350		22 Watts
Radeon HD 6790		150 Watts
	Difference: 128 Watts (582%)

Memory Bandwidth

Performance-wise, the Radeon HD 6790 should theoretically be a lot better than the Radeon HD 4350 overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 4350		8000 MB/sec
	Difference: 126400 (1580%)

Texel Rate

The Radeon HD 6790 will be a lot (approximately 630%) faster with regards to AF than the Radeon HD 4350. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 4350		4600 Mtexels/sec
	Difference: 29000 (630%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6790 is a better choice, and very much so. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 4350		2300 Mpixels/sec
	Difference: 11140 (484%)

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 data (counted in MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines 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 output rate is also dependant 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 maximum fill rate.