Radeon HD 7790 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon R9 M390X		125 Watts
	Difference: 40 Watts (47%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X should be a lot faster than the Radeon HD 7790 in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 64000 (67%)

Texel Rate

The Radeon R9 M390X will be much (about 65%) more effective at texture filtering than the Radeon HD 7790. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 36544 (65%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M390X is superior to the Radeon HD 7790, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 7136 (45%)

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 max amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 can be processed in one second. This figure is calculated by multiplying the total texture units by the core 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 video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.