Radeon HD 7990 vs Radeon R9 280

Intro

Compare all that to the Radeon R9 280, which comes with core speeds of 933 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 RAM. It features 1792 SPUs along with 112 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 280		7961 points
	Difference: 7559 (95%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 280		22 Mh/s
	Difference: 10 (45%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 280		183 Sol/s
	Difference: 330 (180%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 will be 140% quicker than the Radeon R9 280 in general, because of its higher data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 280		240000 MB/sec
	Difference: 336000 (140%)

Texel Rate

The Radeon HD 7990 should be much (about 133%) more effective at AF than the Radeon R9 280. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 280		104496 Mtexels/sec
	Difference: 138704 (133%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7990 is a better choice, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 280		29856 Mpixels/sec
	Difference: 30944 (104%)

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 largest amount of data (in units of MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.