Radeon HD 7970 vs Radeon R9 M380

Intro

Compare that to the Radeon R9 M380, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this particular model. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7970 should perform much faster than the Radeon R9 M380 overall. (explain)

Radeon HD 7970		264000 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 168000 (175%)

Texel Rate

The Radeon HD 7970 should be much (more or less 196%) better at anisotropic filtering than the Radeon R9 M380. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 78400 (196%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7970 is superior to the Radeon R9 M380, and very much so. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 13600 (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 max amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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