GeForce GTX Titan vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this model. 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 Titan		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

In theory, the GeForce GTX Titan should be 80% quicker than the Radeon R9 M390X overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce GTX Titan should be a lot (more or less 103%) better at anisotropic filtering than the Radeon R9 M390X. (explain)

GeForce GTX Titan		187488 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 94944 (103%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX Titan is the winner, by a large margin. (explain)

GeForce GTX Titan		40176 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 17040 (74%)

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 data (measured in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.