Radeon HD 4870 X2 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which comes with a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory running 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

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 will be 44% quicker than the Radeon R9 M395X in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 M395X is much (approximately 54%) faster with regards to 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 small bit (more or less 4%) more effective at FSAA than the Radeon R9 M395X, and also should be capable of handling higher resolutions while still performing well. (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: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the 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 the graphics card could possibly write to its local memory per 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 - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.