GeForce GTX 980 vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which features a clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, 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
GeForce GTX 980		13552 points
	Difference: 1968 (15%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
GeForce GTX 980		20 Mh/s
	Difference: 12 (60%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
GeForce GTX 980		408 Sol/s
	Difference: 105 (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 980		165 Watts
Radeon HD 7990		375 Watts
	Difference: 210 Watts (127%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be a lot better than the GeForce GTX 980 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 980		224000 MB/sec
	Difference: 352000 (157%)

Texel Rate

The Radeon HD 7990 is a lot (approximately 69%) better at anisotropic filtering than the GeForce GTX 980. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 980		144128 Mtexels/sec
	Difference: 99072 (69%)

Pixel Rate

The GeForce GTX 980 is a little bit (approximately 19%) faster with regards to FSAA than the Radeon HD 7990, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 11264 (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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per 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 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 its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.