Geforce GTX 780 vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this specific model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Geforce GTX 780		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 is 80% faster than the Radeon R9 M390X in general, because of its higher data rate. (explain)

Geforce GTX 780		288384 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 128384 (80%)

Texel Rate

The Geforce GTX 780 is much (more or less 79%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 73152 (79%)

Pixel Rate

The Geforce GTX 780 should be much (about 79%) more effective at AA than the Radeon R9 M390X, and capable of handling higher resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 18288 (79%)

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 (in units of MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 can be applied in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.