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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 card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7990, which uses a 28 nm design. AMD has clocked the core frequency at 950 MHz. The GDDR5 memory works at a speed of 1500 MHz on this specific model. It features 2048 SPUs along with 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

Theoretically speaking, the Radeon HD 7990 is 500% faster than the Radeon HD 7790 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7990 is quite a bit (approximately 334%) more effective at texture filtering than the Radeon HD 7790. (explain)

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

Pixel Rate

The Radeon HD 7990 will be quite a bit (more or less 280%) better at anti-aliasing than the Radeon HD 7790, and also should be able to handle higher screen resolutions without losing too much performance. (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 max amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, 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 most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max 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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