Geforce GTX 680 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which has GPU core speed of 950 MHz, and 3072 MB of GDDR5 RAM set to run at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 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
Geforce GTX 680		7650 points
	Difference: 7870 (103%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Geforce GTX 680		16 Mh/s
	Difference: 16 (100%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
Radeon HD 7990		375 Watts
	Difference: 180 Watts (92%)

Memory Bandwidth

Theoretically, the Radeon HD 7990 should perform a lot faster than the Geforce GTX 680 overall. (explain)

Radeon HD 7990		576000 MB/sec
Geforce GTX 680		192256 MB/sec
	Difference: 383744 (200%)

Texel Rate

The Radeon HD 7990 is much (about 89%) faster with regards to AF than the Geforce GTX 680. (explain)

Radeon HD 7990		243200 Mtexels/sec
Geforce GTX 680		128768 Mtexels/sec
	Difference: 114432 (89%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is a better choice, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Geforce GTX 680		32192 Mpixels/sec
	Difference: 28608 (89%)

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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.