Radeon HD 3850 X2 vs Radeon R9 M385X

Intro

Compare all of that to the Radeon R9 M385X, which comes with clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs along with 56 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3850 X2 should be 10% faster than the Radeon R9 M385X in general, because of its higher bandwidth. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 9984 (10%)

Texel Rate

The Radeon R9 M385X is much (about 188%) faster with regards to texture filtering than the Radeon HD 3850 X2. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 40224 (188%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 3850 X2 is a better choice, by far. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 3776 (21%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.