Geforce GTX 780 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which comes with clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 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 780		10082 points
	Difference: 5438 (54%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Geforce GTX 780		20 Mh/s
	Difference: 12 (60%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 780		250 Watts
Radeon HD 7990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 is 100% quicker than the Geforce GTX 780 overall, due to its higher data rate. (explain)

Radeon HD 7990		576000 MB/sec
Geforce GTX 780		288384 MB/sec
	Difference: 287616 (100%)

Texel Rate

The Radeon HD 7990 is much (more or less 47%) better at AF than the Geforce GTX 780. (explain)

Radeon HD 7990		243200 Mtexels/sec
Geforce GTX 780		165696 Mtexels/sec
	Difference: 77504 (47%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (more or less 47%) faster with regards to anti-aliasing than the Geforce GTX 780, and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 7990		60800 Mpixels/sec
Geforce GTX 780		41424 Mpixels/sec
	Difference: 19376 (47%)

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 data (measured in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, the result 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 AA, High Dynamic Range and higher screen 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 speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.