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Radeon HD 7790 vs Radeon HD 7990

Intro

The Radeon HD 7790 uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this particular card. It features 896 SPUs along with 56 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 7990, which features a GPU core clock speed of 950 MHz, and 3072 MB of GDDR5 RAM running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, 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 be quite a bit faster than the Radeon HD 7790 overall. (explain)

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

Texel Rate

The Radeon HD 7990 is a lot (approximately 334%) better at anisotropic filtering than the Radeon HD 7790. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is superior to the Radeon HD 7790, and very much so. (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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 applied per second. This figure is worked out by multiplying the total number of texture units by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. 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 output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to 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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