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Geforce GTX 780 vs Radeon HD 5870


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 is made up of 2304 SPUs, 192 TAUs, and 48 Raster Operation Units.

Compare that to the Radeon HD 5870, which has a clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is made up of 1600(320x5) SPUs, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Geforce GTX 780 250 Watts
Difference: 62 Watts (33%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 should be 88% quicker than the Radeon HD 5870 in general, because of its greater data rate. (explain)

Geforce GTX 780 288384 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 134784 (88%)

Texel Rate

The Geforce GTX 780 is a lot (about 144%) more effective at anisotropic filtering than the Radeon HD 5870. (explain)

Geforce GTX 780 165696 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 97696 (144%)

Pixel Rate

The Geforce GTX 780 should be a lot (about 52%) more effective at FSAA than the Radeon HD 5870, and will be capable of handling higher screen resolutions better. (explain)

Geforce GTX 780 41424 Mpixels/sec
Radeon HD 5870 27200 Mpixels/sec
Difference: 14224 (52%)

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 HD 5870

Specifications

Display Specifications

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Model Geforce GTX 780 Radeon HD 5870
Manufacturer nVidia AMD
Year May 2013 September 23, 2009
Code Name GK110 Cypress XT
Memory 3072 MB 1024 MB
Core Speed 863 MHz 850 MHz
Memory Speed 6008 MHz 4800 MHz
Power (Max TDP) 250 watts 188 watts
Bandwidth 288384 MB/sec 153600 MB/sec
Texel Rate 165696 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 2304 1600(320x5)
Texture Mapping Units 192 80
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 7080 million 2154 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure 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 outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Geforce GTX 780

Radeon HD 5870

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