Radeon HD 7850 vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which uses a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this particular card. It features 2048 SPUs along with 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 7850		130 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

Performance-wise, the Radeon R9 M395X should theoretically be a little bit better than the Radeon HD 7850 overall. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 M395X should be a lot (about 68%) faster with regards to AF than the Radeon HD 7850. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 37504 (68%)

Pixel Rate

The Radeon HD 7850 is a bit (approximately 19%) better at FSAA than the Radeon R9 M395X, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 4384 (19%)

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 (in units of MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.