Radeon HD 7990 vs Radeon R9 290X

Intro

Compare that to the Radeon R9 290X, which comes with core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2816 SPUs along with 176 Texture Address Units and 64 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 290X		10609 points
	Difference: 4911 (46%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 290X		29 Mh/s
	Difference: 3 (10%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 290X		369 Sol/s
	Difference: 144 (39%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 290X		300 Watts
Radeon HD 7990		375 Watts
	Difference: 75 Watts (25%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be a lot superior to the Radeon R9 290X in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 290X		320000 MB/sec
	Difference: 256000 (80%)

Texel Rate

The Radeon HD 7990 should be a lot (approximately 73%) better at texture filtering than the Radeon R9 290X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 290X		140800 Mtexels/sec
	Difference: 102400 (73%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is superior to the Radeon R9 290X, though not by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 290X		51200 Mpixels/sec
	Difference: 9600 (19%)

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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 are applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends 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.