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Radeon HD 7870 vs Radeon R9 270


Intro

The Radeon HD 7870 comes with a GPU clock speed of 1000 MHz, and the 2048 MB of GDDR5 RAM runs at 1200 MHz through a 256-bit bus. It also features 1280 SPUs, 80 TAUs, and 32 ROPs.

Compare all of that to the Radeon R9 270, which makes use of a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory is set to run at a frequency of 1400 MHz on this particular card. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Display Graphs

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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 6230 points
Radeon R9 270 5940 points
Difference: 290 (5%)

Ethereum Mining Hash Rate

Radeon HD 7870 16 Mh/s
Radeon R9 270 15 Mh/s
Difference: 1 (7%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270 150 Watts
Radeon HD 7870 175 Watts
Difference: 25 Watts (17%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 270 will be 17% quicker than the Radeon HD 7870 overall, due to its higher data rate. (explain)

Radeon R9 270 179200 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 25600 (17%)

Texel Rate

The Radeon HD 7870 should be a small bit (approximately 11%) faster with regards to texture filtering than the Radeon R9 270. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon R9 270 72000 Mtexels/sec
Difference: 8000 (11%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7870 is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon R9 270 28800 Mpixels/sec
Difference: 3200 (11%)

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

Radeon HD 7870

Radeon R9 270

Specifications

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Model Radeon HD 7870 Radeon R9 270
Manufacturer AMD AMD
Year March 2012 November 2013
Code Name Pitcairn XT Curacao Pro
Memory 2048 MB 2048 MB
Core Speed 1000 MHz 900 MHz
Memory Speed 4800 MHz 5600 MHz
Power (Max TDP) 175 watts 150 watts
Bandwidth 153600 MB/sec 179200 MB/sec
Texel Rate 80000 Mtexels/sec 72000 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 1280 1280
Texture Mapping Units 80 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 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 max amount of data (measured in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Radeon HD 7870

Radeon R9 270

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