GeForce GTX 780 Ti vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which has 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 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
GeForce GTX 780 Ti		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

The GeForce GTX 780 Ti should theoretically be much faster than the Radeon R9 M395X in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 176000 (110%)

Texel Rate

The GeForce GTX 780 Ti is quite a bit (more or less 127%) faster with regards to anisotropic filtering than the Radeon R9 M395X. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 117456 (127%)

Pixel Rate

The GeForce GTX 780 Ti will be a lot (approximately 82%) faster with regards to full screen anti-aliasing than the Radeon R9 M395X, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 18864 (82%)

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 largest amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses 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 better 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 can be applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 maximum fill rate.