GeForce GTX 1080 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which comes with a clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

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

GeForce GTX 1080		21942 points
Radeon HD 7990		15520 points
	Difference: 6422 (41%)

Zcash Mining Hash Rate

GeForce GTX 1080		553 Sol/s
Radeon HD 7990		513 Sol/s
	Difference: 40 (8%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
GeForce GTX 1080		20 Mh/s
	Difference: 12 (60%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 1080		180 Watts
Radeon HD 7990		375 Watts
	Difference: 195 Watts (108%)

Memory Bandwidth

The Radeon HD 7990 should theoretically perform quite a bit faster than the GeForce GTX 1080 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 1080		327680 MB/sec
	Difference: 248320 (76%)

Texel Rate

The GeForce GTX 1080 is a small bit (more or less 6%) better at AF than the Radeon HD 7990. (explain)

GeForce GTX 1080		257120 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 13920 (6%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 1080 is the winner, by far. (explain)

GeForce GTX 1080		102848 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 42048 (69%)

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 max amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.