Geforce GTX 780 vs Radeon R9 M385X

Intro

Compare all that to the Radeon R9 M385X, which features a clock speed of 1100 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Geforce GTX 780 should be 200% faster than the Radeon R9 M385X in general, due to its greater bandwidth. (explain)

Geforce GTX 780		288384 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 192384 (200%)

Texel Rate

The Geforce GTX 780 will be quite a bit (approximately 169%) more effective at texture filtering than the Radeon R9 M385X. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 104096 (169%)

Pixel Rate

The Geforce GTX 780 will be a lot (approximately 135%) better at FSAA than the Radeon R9 M385X, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 23824 (135%)

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 data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.