Radeon HD 7770 vs Radeon RX 470 4GB

Intro

Compare those specs to the Radeon RX 470 4GB, which has core clock speeds of 926 MHz on the GPU, and 1650 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon RX 470 4GB		120 Watts
	Difference: 40 Watts (50%)

Memory Bandwidth

Performance-wise, the Radeon RX 470 4GB should in theory be quite a bit better than the Radeon HD 7770 in general. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 139200 (193%)

Texel Rate

The Radeon RX 470 4GB should be a lot (more or less 196%) more effective at anisotropic filtering than the Radeon HD 7770. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 78528 (196%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 470 4GB is superior to the Radeon HD 7770, by far. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 13632 (85%)

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 largest amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.