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Radeon HD 7870 XT vs Radeon R9 270X

Intro

The Radeon HD 7870 XT makes use of a 28 nm design. ATi has set the core speed at 925 MHz. The GDDR5 memory works at a frequency of 1500 MHz on this particular model. It features 1536 SPUs along with 96 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon R9 270X, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1400 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X 180 Watts
Radeon HD 7870 XT 185 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

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

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

Texel Rate

The Radeon HD 7870 XT should be a little bit (approximately 11%) more effective at texture filtering than the Radeon R9 270X. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon R9 270X 80000 Mtexels/sec
Difference: 8800 (11%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 270X is a better choice, though only just barely. (explain)

Radeon R9 270X 32000 Mpixels/sec
Radeon HD 7870 XT 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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 7870 XT

Amazon.com

Other US-based stores

Radeon R9 270X

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 7870 XT Radeon R9 270X
Manufacturer ATi ATi
Year November 2012 October 2013
Code Name Tahiti LE Curacao XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 925 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1500 MHz (6000 MHz effective) 1400 MHz (5600 MHz effective)
Unified Shaders 1536 1280
Texture Mapping Units 96 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 185 watts 180 watts
Shader Model 5.0 5.0
Bandwidth 192000 MB/sec 179200 MB/sec
Texel Rate 88800 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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