Geforce GTX 1080 Ti vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which comes with a clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, 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 Ti		27629 points
Radeon HD 7990		15520 points
	Difference: 12109 (78%)

Zcash Mining Hash Rate

Geforce GTX 1080 Ti		710 Sol/s
Radeon HD 7990		513 Sol/s
	Difference: 197 (38%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 1080 Ti		250 Watts
Radeon HD 7990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be 16% quicker than the Geforce GTX 1080 Ti in general, because of its greater bandwidth. (explain)

Radeon HD 7990		576000 MB/sec
Geforce GTX 1080 Ti		495616 MB/sec
	Difference: 80384 (16%)

Texel Rate

The Geforce GTX 1080 Ti should be much (more or less 36%) more effective at AF than the Radeon HD 7990. (explain)

Geforce GTX 1080 Ti		331520 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 88320 (36%)

Pixel Rate

If running with a high resolution is important to you, then the Geforce GTX 1080 Ti is a better choice, by a large margin. (explain)

Geforce GTX 1080 Ti		130240 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 69440 (114%)

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 (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.