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Radeon HD 7990 vs Radeon R9 Nano

Intro

The Radeon HD 7990 has a 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 is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Compare those specs to the Radeon R9 Nano, which features clock speeds of 1000 MHz on the GPU, and 500 MHz on the 4096 MB of HBM RAM. It features 4096 SPUs as well as 256 TAUs and 64 Rasterization Operator Units.

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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 R9 Nano 14918 points
Difference: 602 (4%)

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
Radeon R9 Nano 30 Mh/s
Difference: 2 (7%)

Zcash Mining Hash Rate

Radeon HD 7990 513 Sol/s
Radeon R9 Nano 402 Sol/s
Difference: 111 (28%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 Nano 175 Watts
Radeon HD 7990 375 Watts
Difference: 200 Watts (114%)

Memory Bandwidth

Theoretically, the Radeon HD 7990 should be a small bit faster than the Radeon R9 Nano in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon R9 Nano 512000 MB/sec
Difference: 64000 (13%)

Texel Rate

The Radeon R9 Nano should be a little bit (approximately 5%) better at anisotropic filtering than the Radeon HD 7990. (explain)

Radeon R9 Nano 256000 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 12800 (5%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 Nano is a better choice, but only just. (explain)

Radeon R9 Nano 64000 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 3200 (5%)

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 7990

Amazon.com

Check prices at:

Radeon R9 Nano

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 7990 Radeon R9 Nano
Manufacturer AMD AMD
Year April 2013 September 2015
Code Name Malta Fiji XT
Memory 3072 MB (x2) 4096 MB
Core Speed 950 MHz (x2) 1000 MHz
Memory Speed 6000 MHz (x2) 500 MHz
Power (Max TDP) 375 watts 175 watts
Bandwidth 576000 MB/sec 512000 MB/sec
Texel Rate 243200 Mtexels/sec 256000 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 2048 (x2) 4096
Texture Mapping Units 128 (x2) 256
Render Output Units 32 (x2) 64
Bus Type GDDR5 HBM
Bus Width 384-bit (x2) 4096-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 8900 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, 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 most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. 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 lots of other factors, especially the memory bandwidth - 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 7990

Amazon.com

Check prices at:

Radeon R9 Nano

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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