Radeon HD 6870 vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which features GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, 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 6870		151 Watts
	Difference: 26 Watts (21%)

Memory Bandwidth

In theory, the Radeon R9 M395X should be 19% quicker than the Radeon HD 6870 in general, because of its higher data rate. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 6870		134400 MB/sec
	Difference: 25600 (19%)

Texel Rate

The Radeon R9 M395X should be a lot (about 84%) more effective at AF than the Radeon HD 6870. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 6870		50400 Mtexels/sec
	Difference: 42144 (84%)

Pixel Rate

The Radeon HD 6870 will be much (approximately 24%) better at full screen anti-aliasing than the Radeon R9 M395X, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 5664 (24%)

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 (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at 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 could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.