Radeon R9 M265X vs Radeon R9 M385X

Intro

Compare all of that to the Radeon R9 M385X, which features a core clock frequency of 1100 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It features 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon R9 M385X should be a lot faster than the Radeon R9 M265X overall. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 24000 (33%)

Texel Rate

The Radeon R9 M385X will be a lot (about 168%) more effective at AF than the Radeon R9 M265X. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 38600 (168%)

Pixel Rate

The Radeon R9 M385X will be much (more or less 91%) better at AA than the Radeon R9 M265X, and will be capable of handling higher screen resolutions better. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 8400 (91%)

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 data (in units of megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen 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 number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could 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 colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.