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Radeon HD 7790 vs Radeon HD 7870 XT

Intro

The Radeon HD 7790 comes with core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 7870 XT, which features GPU clock speed of 925 MHz, and 2048 MB of GDDR5 RAM running at 1500 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 Texture Address Units, and 32 Raster Operation 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 7870 XT 6390 points
Radeon HD 7790 4330 points
Difference: 2060 (48%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 7870 XT 185 Watts
Difference: 100 Watts (118%)

Memory Bandwidth

In theory, the Radeon HD 7870 XT should be 100% quicker than the Radeon HD 7790 overall, because of its higher data rate. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 96000 (100%)

Texel Rate

The Radeon HD 7870 XT will be quite a bit (about 59%) faster with regards to AF than the Radeon HD 7790. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 32800 (59%)

Pixel Rate

The Radeon HD 7870 XT is quite a bit (about 85%) better at FSAA than the Radeon HD 7790, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 13600 (85%)

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.

Price Comparison

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Radeon HD 7790

Amazon.com

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Radeon HD 7870 XT

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 7870 XT
Manufacturer AMD AMD
Year March 2013 November 2012
Code Name Bonaire XT Tahiti LE
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 925 MHz
Memory Speed 6000 MHz 6000 MHz
Power (Max TDP) 85 watts 185 watts
Bandwidth 96000 MB/sec 192000 MB/sec
Texel Rate 56000 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 896 1536
Texture Mapping Units 56 96
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
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 max amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 can be applied per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 7790

Amazon.com

Check prices at:

Radeon HD 7870 XT

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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