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Radeon HD 7870 XT vs Radeon HD 7990

Intro

The Radeon HD 7870 XT features a GPU clock speed of 925 MHz, and the 2048 MB of GDDR5 RAM runs at 1500 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon HD 7990, which has GPU core speed of 950 MHz, and 3072 MB of GDDR5 memory set to run at 1500 MHz through a 384-bit bus. It also features 2048 SPUs, 128 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 7990 15520 points
Radeon HD 7870 XT 6390 points
Difference: 9130 (143%)

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 17 (113%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon HD 7990 375 Watts
Difference: 190 Watts (103%)

Memory Bandwidth

The Radeon HD 7990 should theoretically be much faster than the Radeon HD 7870 XT in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 384000 (200%)

Texel Rate

The Radeon HD 7990 will be much (more or less 174%) faster with regards to texture filtering than the Radeon HD 7870 XT. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 154400 (174%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is a better choice, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 31200 (105%)

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 7870 XT

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 7870 XT Radeon HD 7990
Manufacturer AMD AMD
Year November 2012 April 2013
Code Name Tahiti LE Malta
Memory 2048 MB 3072 MB (x2)
Core Speed 925 MHz 950 MHz (x2)
Memory Speed 6000 MHz 6000 MHz (x2)
Power (Max TDP) 185 watts 375 watts
Bandwidth 192000 MB/sec 576000 MB/sec
Texel Rate 88800 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 1536 2048 (x2)
Texture Mapping Units 96 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 28 nm 28 nm
Transistors 4313 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 (in units of MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 7870 XT

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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