Radeon HD 7990 vs Radeon R9 280

Intro

Compare those specifications to the Radeon R9 280, which features GPU core speed of 933 MHz, and 3072 MB of GDDR5 memory set to run at 1250 MHz through a 384-bit bus. It also is comprised of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

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

The Radeon HD 7990, in theory, should perform much faster than the Radeon R9 280 overall. (explain)

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

Texel Rate

The Radeon HD 7990 is quite a bit (more or less 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 using lots of anti-aliasing is important to you, then the Radeon HD 7990 is superior to the Radeon R9 280, 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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 are applied in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.