Radeon HD 7990 vs Radeon R9 280X

Intro

Compare those specs to the Radeon R9 280X, which has a GPU core clock speed of 850 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation 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 280X		8886 points
	Difference: 6634 (75%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 280X		21 Mh/s
	Difference: 11 (52%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 280X		294 Sol/s
	Difference: 219 (74%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 280X		250 Watts
Radeon HD 7990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform much faster than the Radeon R9 280X in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 280X		288000 MB/sec
	Difference: 288000 (100%)

Texel Rate

The Radeon HD 7990 is much (more or less 124%) more effective at AF than the Radeon R9 280X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 280X		108800 Mtexels/sec
	Difference: 134400 (124%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7990 is a better choice, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 280X		27200 Mpixels/sec
	Difference: 33600 (124%)

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 maximum amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.