Radeon R9 M265X vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which comes with a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 M395X, in theory, should perform quite a bit faster than the Radeon R9 M265X in general. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 88000 (122%)

Texel Rate

The Radeon R9 M395X is a lot (about 302%) better at texture filtering than the Radeon R9 M265X. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 69544 (302%)

Pixel Rate

The Radeon R9 M395X should be much (more or less 151%) better at FSAA than the Radeon R9 M265X, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 13936 (151%)

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 largest amount of data (in units of MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If 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 high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.