GeForce GTX 780 Ti vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which features GPU core speed of 1100 MHz, and 4096 MB of GDDR5 RAM set to run at 1500 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 780 Ti should in theory be quite a bit better than the Radeon R9 M385X in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 240000 (250%)

Texel Rate

The GeForce GTX 780 Ti is a lot (approximately 241%) better at texture filtering than the Radeon R9 M385X. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 148400 (241%)

Pixel Rate

The GeForce GTX 780 Ti should be quite a bit (about 139%) faster with regards to anti-aliasing than the Radeon R9 M385X, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 24400 (139%)

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 largest amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video 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 maximum number of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.