Radeon HD 7990 vs Radeon R9 M365X

Intro

Compare that to the Radeon R9 M365X, which has a core clock speed of 925 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be quite a bit better than the Radeon R9 M365X in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 M365X		72000 MB/sec
	Difference: 504000 (700%)

Texel Rate

The Radeon HD 7990 should be much (more or less 557%) faster with regards to anisotropic filtering than the Radeon R9 M365X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 M365X		37000 Mtexels/sec
	Difference: 206200 (557%)

Pixel Rate

The Radeon HD 7990 will be a lot (more or less 311%) more effective at anti-aliasing than the Radeon R9 M365X, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 M365X		14800 Mpixels/sec
	Difference: 46000 (311%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at 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 its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.