Radeon HD 6870 vs Radeon R9 M395X

Intro

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

Memory Bandwidth

Performance-wise, the Radeon R9 M395X should theoretically be a small bit superior to the Radeon HD 6870 overall. (explain)

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

Texel Rate

The Radeon R9 M395X is a lot (approximately 84%) more effective at texture filtering 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 is a lot (more or less 24%) better at FSAA than the Radeon R9 M395X, and also should be capable of handling higher screen resolutions better. (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 information (measured in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.