Radeon HD 7790 vs Radeon R9 M270X

Intro

Compare those specs to the Radeon R9 M270X, which comes with GPU clock speed of 725 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also features 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 7790 should in theory be quite a bit better than the Radeon R9 M270X overall. (explain)

Radeon HD 7790		96000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 24000 (33%)

Texel Rate

The Radeon HD 7790 will be quite a bit (more or less 93%) faster with regards to texture filtering than the Radeon R9 M270X. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 27000 (93%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7790 is the winner, by far. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 4400 (38%)

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 largest amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the bandwidth is, the lower the potential to reach the max fill rate.