Radeon HD 4870 X2 vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which comes with core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 225 Watts (180%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 X2 should in theory be quite a bit superior to the Radeon R9 M395X in general. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 70400 (44%)

Texel Rate

The Radeon R9 M395X is quite a bit (more or less 54%) more effective at anisotropic filtering than the Radeon HD 4870 X2. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 32544 (54%)

Pixel Rate

The Radeon HD 4870 X2 will be a bit (more or less 4%) faster with regards to anti-aliasing than the Radeon R9 M395X, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 864 (4%)

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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.