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Radeon HD 7790 vs Radeon HD 7990

Intro

The Radeon HD 7790 features a clock speed of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 7990, which features a core clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 384-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

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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
Radeon HD 7790 4330 points
Difference: 11190 (258%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 7990 375 Watts
Difference: 290 Watts (341%)

Memory Bandwidth

In theory, the Radeon HD 7990 should perform much faster than the Radeon HD 7790 in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 480000 (500%)

Texel Rate

The Radeon HD 7990 will be quite a bit (more or less 334%) more effective at AF than the Radeon HD 7790. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 187200 (334%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is superior to the Radeon HD 7790, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 44800 (280%)

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

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Radeon HD 7790

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 7790 Radeon HD 7990
Manufacturer AMD AMD
Year March 2013 April 2013
Code Name Bonaire XT Malta
Memory 1024 MB 3072 MB (x2)
Core Speed 1000 MHz 950 MHz (x2)
Memory Speed 6000 MHz 6000 MHz (x2)
Power (Max TDP) 85 watts 375 watts
Bandwidth 96000 MB/sec 576000 MB/sec
Texel Rate 56000 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 896 2048 (x2)
Texture Mapping Units 56 128 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 128-bit 384-bit (x2)
Fab Process 28 nm 28 nm
Transistors 2080 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 7790

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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