Radeon HD 7770 vs Radeon RX 480 4GB

Intro

Compare all of that to the Radeon RX 480 4GB, which comes with core clock speeds of 1120 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. It features 2304 SPUs as well as 144 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon RX 480 4GB		150 Watts
	Difference: 70 Watts (88%)

Memory Bandwidth

The Radeon RX 480 4GB, in theory, should be quite a bit faster than the Radeon HD 7770 overall. (explain)

Radeon RX 480 4GB		229376 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 157376 (219%)

Texel Rate

The Radeon RX 480 4GB will be quite a bit (about 303%) better at texture filtering than the Radeon HD 7770. (explain)

Radeon RX 480 4GB		161280 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 121280 (303%)

Pixel Rate

The Radeon RX 480 4GB will be quite a bit (about 124%) better at AA than the Radeon HD 7770, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon RX 480 4GB		35840 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 19840 (124%)

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 max amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.