Radeon HD 4790 vs Radeon R9 M370X

Intro

Compare those specs to the Radeon R9 M370X, which has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4790 should theoretically be quite a bit superior to the Radeon R9 M370X overall. (explain)

Radeon HD 4790		102400 MB/sec
Radeon R9 M370X		72000 MB/sec
	Difference: 30400 (42%)

Texel Rate

The Radeon R9 M370X will be quite a bit (about 67%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon R9 M370X		32000 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 12800 (67%)

Pixel Rate

The Radeon R9 M370X should be much (approximately 33%) more effective at AA than the Radeon HD 4790, and capable of handling higher screen resolutions better. (explain)

Radeon R9 M370X		12800 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 3200 (33%)

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 max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.