Radeon HD 7850 vs Radeon R9 M295X

Intro

Compare those specifications to the Radeon R9 M295X, which has clock speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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 is 15% faster than the Radeon HD 7850 overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 M295X should be quite a bit (approximately 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

The Radeon HD 7850 should be a small bit (more or less 15%) faster with regards to AA than the Radeon R9 M295X, and also able to handle higher resolutions better. (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: Bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core 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 in one second.

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