Radeon HD 6850 vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which has 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 SPUs, 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 6850		127 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

Performance-wise, the Radeon R9 M395X should theoretically be quite a bit superior to the Radeon HD 6850 in general. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 6850		128000 MB/sec
	Difference: 32000 (25%)

Texel Rate

The Radeon R9 M395X is much (approximately 149%) better at AF than the Radeon HD 6850. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 6850		37200 Mtexels/sec
	Difference: 55344 (149%)

Pixel Rate

The Radeon HD 6850 will be a little bit (about 7%) faster with regards to anti-aliasing than the Radeon R9 M395X, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6850		24800 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 1664 (7%)

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 max amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few 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.