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Geforce GTX 780 vs Radeon R9 270X

Intro

The Geforce GTX 780 features a GPU clock speed of 863 MHz, and the 3072 MB of GDDR5 RAM runs at 1502 MHz through a 384-bit bus. It also features 2304 SPUs, 192 TAUs, and 48 ROPs.

Compare those specs to the Radeon R9 270X, which comes with GPU core speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1400 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 TAUs, 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
Geforce GTX 780 250 Watts
Difference: 70 Watts (39%)

Memory Bandwidth

Theoretically, the Geforce GTX 780 should perform much faster than the Radeon R9 270X overall. (explain)

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

Texel Rate

The Geforce GTX 780 is much (approximately 107%) more effective at texture 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 is quite a bit (approximately 29%) better at anti-aliasing than the Radeon R9 270X, and also able to handle higher screen resolutions more effectively. (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

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

Model Geforce GTX 780 Radeon R9 270X
Manufacturer nVidia AMD
Year May 2013 October 2013
Code Name GK110 Curacao XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 3072 MB 2048 MB
Core Speed 863 MHz 1000 MHz
Shader Speed 863 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1400 MHz (5600 MHz effective)
Unified Shaders 2304 1280
Texture Mapping Units 192 80
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 250 watts 180 watts
Shader Model 5.0 5.0
Bandwidth 288384 MB/sec 179200 MB/sec
Texel Rate 165696 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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