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Radeon HD 7870 XT vs Radeon R9 270

Intro

The Radeon HD 7870 XT features a core clock frequency of 925 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare that to the Radeon R9 270, which comes with core clock speeds of 900 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 80 TAUs 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 7870 XT 6390 points
Radeon R9 270 5943 points
Difference: 447 (8%)

Ethereum Mining Hash Rate

Radeon HD 7870 XT 15 Mh/s
Radeon R9 270 15 Mh/s
Difference: 0 (0%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270 150 Watts
Radeon HD 7870 XT 185 Watts
Difference: 35 Watts (23%)

Memory Bandwidth

The Radeon HD 7870 XT should theoretically perform a little bit faster than the Radeon R9 270 in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 270 179200 MB/sec
Difference: 12800 (7%)

Texel Rate

The Radeon HD 7870 XT is much (about 23%) more effective at anisotropic filtering than the Radeon R9 270. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon R9 270 72000 Mtexels/sec
Difference: 16800 (23%)

Pixel Rate

The Radeon HD 7870 XT will be just a bit (more or less 3%) better at full screen anti-aliasing than the Radeon R9 270, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon R9 270 28800 Mpixels/sec
Difference: 800 (3%)

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 7870 XT

Amazon.com

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Radeon R9 270

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 R9 270
Manufacturer AMD AMD
Year November 2012 November 2013
Code Name Tahiti LE Curacao Pro
Memory 2048 MB 2048 MB
Core Speed 925 MHz 900 MHz
Memory Speed 6000 MHz 5600 MHz
Power (Max TDP) 185 watts 150 watts
Bandwidth 192000 MB/sec 179200 MB/sec
Texel Rate 88800 Mtexels/sec 72000 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 1536 1280
Texture Mapping Units 96 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-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 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the 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 number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory 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 R9 270

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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