Radeon HD 6850 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which features GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is comprised of 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 6850		127 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X is 25% quicker than the Radeon HD 6850 overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 M395X will be a lot (about 149%) more effective at texture filtering than the Radeon HD 6850. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6850 is the winner, but only just. (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 maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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