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Geforce GTX 780 vs Radeon R9 270X

Intro

The Geforce GTX 780 features a GPU core clock speed of 863 MHz, and the 3072 MB of GDDR5 memory is set to run at 1502 MHz through a 384-bit bus. It also is made up of 2304 SPUs, 192 Texture Address Units, and 48 ROPs.

Compare all of that to the Radeon R9 270X, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1400 MHz through a 256-bit bus. It also features 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X 180 Watts
Geforce GTX 780 250 Watts
Difference: 70 Watts (39%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 780 should in theory be quite a bit superior to the Radeon R9 270X in general. (explain)

Geforce GTX 780 288384 MB/sec
Radeon R9 270X 179200 MB/sec
Difference: 109184 (61%)

Texel Rate

The Geforce GTX 780 should be much (about 107%) faster with regards to anisotropic filtering than the Radeon R9 270X. (explain)

Geforce GTX 780 165696 Mtexels/sec
Radeon R9 270X 80000 Mtexels/sec
Difference: 85696 (107%)

Pixel Rate

The Geforce GTX 780 should be a lot (more or less 29%) more effective at AA than the Radeon R9 270X, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Geforce GTX 780 41424 Mpixels/sec
Radeon R9 270X 32000 Mpixels/sec
Difference: 9424 (29%)

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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Geforce GTX 780

Amazon.com

Radeon R9 270X

Amazon.com

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 Geforce GTX 780 Radeon R9 270X
Manufacturer nVidia AMD
Year May 2013 October 2013
Code Name GK110 Curacao XT
Memory 3072 MB 2048 MB
Core Speed 863 MHz 1000 MHz
Memory Speed 6008 MHz 5600 MHz
Power (Max TDP) 250 watts 180 watts
Bandwidth 288384 MB/sec 179200 MB/sec
Texel Rate 165696 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 2304 1280
Texture Mapping Units 192 80
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 7080 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 are processed in one second. This figure is calculated by multiplying the total amount of texture units of the card 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 amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 potential to get to the maximum fill rate.

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