Radeon HD 3690/3830 vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which comes with GPU clock speed of 1100 MHz, and 4096 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 M385X should be 262% quicker than the Radeon HD 3690/3830 in general, because of its greater bandwidth. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 69504 (262%)

Texel Rate

The Radeon R9 M385X is quite a bit (more or less 476%) faster with regards to texture filtering than the Radeon HD 3690/3830. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 50912 (476%)

Pixel Rate

The Radeon R9 M385X is quite a bit (about 65%) more effective at FSAA than the Radeon HD 3690/3830, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 3690/3830		10688 Mpixels/sec
	Difference: 6912 (65%)

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 information (measured in megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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