Radeon HD 7790 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon R9 M395X		125 Watts
	Difference: 40 Watts (47%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M395X should theoretically be much better than the Radeon HD 7790 overall. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 64000 (67%)

Texel Rate

The Radeon R9 M395X is quite a bit (more or less 65%) faster with regards to AF than the Radeon HD 7790. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 36544 (65%)

Pixel Rate

The Radeon R9 M395X should be quite a bit (about 45%) more effective at FSAA than the Radeon HD 7790, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 7136 (45%)

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 megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could 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 Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.