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Radeon HD 7970 vs Radeon R9 270X

Intro

The Radeon HD 7970 has a clock speed of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 270X, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory is set to run at a speed of 1400 MHz on this model. It features 1280 SPUs along with 80 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 7970 8225 points
Radeon R9 270X 6590 points
Difference: 1635 (25%)

Ethereum Mining Hash Rate

Radeon HD 7970 21 Mh/s
Radeon R9 270X 18 Mh/s
Difference: 3 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X 180 Watts
Radeon HD 7970 250 Watts
Difference: 70 Watts (39%)

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should in theory be much superior to the Radeon R9 270X in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon R9 270X 179200 MB/sec
Difference: 84800 (47%)

Texel Rate

The Radeon HD 7970 is a lot (about 48%) better at texture filtering than the Radeon R9 270X. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon R9 270X 80000 Mtexels/sec
Difference: 38400 (48%)

Pixel Rate

The Radeon R9 270X will be a little bit (about 8%) faster with regards to FSAA than the Radeon HD 7970, and capable of handling higher resolutions while still performing well. (explain)

Radeon R9 270X 32000 Mpixels/sec
Radeon HD 7970 29600 Mpixels/sec
Difference: 2400 (8%)

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 7970

Amazon.com

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Radeon R9 270X

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 7970 Radeon R9 270X
Manufacturer AMD AMD
Year January 2012 October 2013
Code Name Tahiti XT Curacao XT
Memory 3072 MB 2048 MB
Core Speed 925 MHz 1000 MHz
Memory Speed 5500 MHz 5600 MHz
Power (Max TDP) 250 watts 180 watts
Bandwidth 264000 MB/sec 179200 MB/sec
Texel Rate 118400 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 2048 1280
Texture Mapping Units 128 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, 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 most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 7970

Amazon.com

Check prices at:

Radeon R9 270X

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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