Radeon HD 4850 X2 512MB vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which features a clock frequency of 1100 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB should perform quite a bit faster than the Radeon R9 M385X in general. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 31104 (32%)

Texel Rate

The Radeon R9 M385X is much (more or less 23%) better at anisotropic filtering than the Radeon HD 4850 X2 512MB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 4850 X2 512MB		50000 Mtexels/sec
	Difference: 11600 (23%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4850 X2 512MB is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 2400 (14%)

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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.