Radeon HD 4790 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 works at a speed of 1100 MHz on this particular model. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4790 is 191% faster than the Radeon R9 M375 overall, due to its greater data rate. (explain)

Radeon HD 4790		102400 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 67200 (191%)

Texel Rate

The Radeon R9 M375 should be much (about 111%) better at texture filtering than the Radeon HD 4790. (explain)

Radeon R9 M375		40600 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 21400 (111%)

Pixel Rate

The Radeon R9 M375 should be a lot (about 69%) more effective at full screen anti-aliasing than the Radeon HD 4790, and should be able to handle higher resolutions while still performing well. (explain)

Radeon R9 M375		16240 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 6640 (69%)

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 information (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, 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 video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.