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Radeon HD 7990 vs Radeon R9 Nano

Intro

The Radeon HD 7990 comes with clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon R9 Nano, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The HBM memory is set to run at a speed of 500 MHz on this card. 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 speaking, the Radeon HD 7990 is 13% faster than the Radeon R9 Nano overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon R9 Nano is a small bit (approximately 5%) more effective at AF than the Radeon HD 7990. (explain)

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

Pixel Rate

The Radeon R9 Nano should be just a bit (more or less 5%) faster with regards to FSAA than the Radeon HD 7990, and will be capable of handling higher resolutions more effectively. (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

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Radeon R9 Nano

Amazon.com

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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 max amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the 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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