Radeon HD 7790 vs Radeon R9 M375

Intro

Compare that to the Radeon R9 M375, which makes use of a 28 nm design. AMD has set the core speed at 1015 MHz. The DDR3 memory is set to run at a speed of 1100 MHz on this particular card. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7790 should be 173% quicker than the Radeon R9 M375 overall, due to its higher data rate. (explain)

Radeon HD 7790		96000 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 60800 (173%)

Texel Rate

The Radeon HD 7790 should be a lot (about 38%) faster with regards to anisotropic filtering than the Radeon R9 M375. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon R9 M375		40600 Mtexels/sec
	Difference: 15400 (38%)

Pixel Rate

The Radeon R9 M375 is a little bit (about 2%) better at FSAA than the Radeon HD 7790, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon R9 M375		16240 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 240 (2%)

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 (in units of MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 applied per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.