Radeon HD 7990 vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which has core clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7990		15520 points
Radeon R9 380X		9519 points
	Difference: 6001 (63%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 380X		19 Mh/s
	Difference: 13 (68%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380X		190 Watts
Radeon HD 7990		375 Watts
	Difference: 185 Watts (97%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be much superior to the Radeon R9 380X overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 380X		182400 MB/sec
	Difference: 393600 (216%)

Texel Rate

The Radeon HD 7990 will be much (about 96%) faster with regards to anisotropic filtering than the Radeon R9 380X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 380X		124160 Mtexels/sec
	Difference: 119040 (96%)

Pixel Rate

The Radeon HD 7990 is a lot (about 96%) more effective at full screen anti-aliasing than the Radeon R9 380X, and also will be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 380X		31040 Mpixels/sec
	Difference: 29760 (96%)

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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.