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Radeon HD 7970 vs Radeon R9 270X

Intro

The Radeon HD 7970 makes use of a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 RAM works at a frequency of 1375 MHz on this particular card. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Compare those specifications to the Radeon R9 270X, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1400 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It features 1280 SPUs, 80 TAUs, 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 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

The Radeon HD 7970, in theory, should perform much faster than the Radeon R9 270X overall. (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 (more or less 48%) more effective 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 bit (approximately 8%) more effective at anti-aliasing than the Radeon HD 7970, and also will be capable of handling higher resolutions without slowing down too much. (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 MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 ability to reach the max 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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