Radeon HD 5770 vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which uses a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 memory works at a frequency of 1050 MHz on this model. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 6790		150 Watts
	Difference: 42 Watts (39%)

Memory Bandwidth

The Radeon HD 6790, in theory, should perform a lot faster than the Radeon HD 5770 overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 57600 (75%)

Texel Rate

The Radeon HD 5770 is a bit (about 1%) faster with regards to AF than the Radeon HD 6790. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 400 (1%)

Pixel Rate

The Radeon HD 5770 should be a bit (more or less 1%) more effective at FSAA than the Radeon HD 6790, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 160 (1%)

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 largest amount of information (counted in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen 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 amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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