Radeon HD 7990 vs Radeon R9 280

Intro

Compare those specifications to the Radeon R9 280, which comes with a core clock frequency of 933 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 112 Texture Address Units, 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 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

In theory, the Radeon HD 7990 should be 140% quicker than the Radeon R9 280 in general, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 7990 will be a lot (approximately 133%) better 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

The Radeon HD 7990 is much (about 104%) more effective at AA than the Radeon R9 280, and also should be able to handle higher resolutions better. (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 largest amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write 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 clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few 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.