Radeon HD 3690/3830 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has a core clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830		75 Watts
Radeon R9 M390X		125 Watts
	Difference: 50 Watts (67%)

Memory Bandwidth

The Radeon R9 M390X should theoretically perform much faster than the Radeon HD 3690/3830 overall. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 133504 (504%)

Texel Rate

The Radeon R9 M390X will be a lot (more or less 766%) more effective at AF than the Radeon HD 3690/3830. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 81856 (766%)

Pixel Rate

The Radeon R9 M390X should be quite a bit (about 116%) faster with regards to full screen anti-aliasing than the Radeon HD 3690/3830, and capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 3690/3830		10688 Mpixels/sec
	Difference: 12448 (116%)

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 (measured in megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.