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Geforce GTX 780 vs Radeon R9 270X

Intro

The Geforce GTX 780 has a GPU core speed of 863 MHz, and the 3072 MB of GDDR5 RAM is set to run at 1502 MHz through a 384-bit bus. It also is comprised of 2304 Stream Processors, 192 Texture Address Units, and 48 Raster Operation Units.

Compare all of that to the Radeon R9 270X, which features GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1400 MHz through a 256-bit bus. It also is made up of 1280 Stream Processors, 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

The Geforce GTX 780 should theoretically be a lot 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 (about 107%) more effective at 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 quite a bit (more or less 29%) more effective at anti-aliasing 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

Geforce GTX 780

Radeon R9 270X

Specifications

Display 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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Geforce GTX 780

Radeon R9 270X

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