Radeon HD 7850 vs Radeon R9 M295X

Intro

Compare that to the Radeon R9 M295X, which has GPU clock speed of 750 MHz, and 4096 MB of GDDR5 RAM running at 1375 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 M295X		125 Watts
Radeon HD 7850		130 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M295X should perform a bit faster than the Radeon HD 7850 overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 22400 (15%)

Texel Rate

The Radeon R9 M295X should be a lot (more or less 74%) faster with regards to texture filtering than the Radeon HD 7850. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 40960 (74%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7850 is a better choice, though only just barely. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 3520 (15%)

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 data (in units of MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed 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 better the texel rate, the better the card will be at handling 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 its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.