Geforce GTX 780 vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which uses a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this particular card. It features 2048 SPUs as well as 128 TAUs 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

The Geforce GTX 780 should in theory perform quite a bit faster than the Radeon R9 M390X in general. (explain)

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

Texel Rate

The Geforce GTX 780 should be quite a bit (more or less 79%) better 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 will be quite a bit (more or less 79%) more effective at AA than the Radeon R9 M390X, and also able to handle higher screen resolutions without slowing down too much. (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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.