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Geforce GTX 780 vs Radeon HD 5870

Intro

The Geforce GTX 780 makes use of a 28 nm design. nVidia has set the core frequency at 863 MHz. The GDDR5 RAM runs at a speed of 1502 MHz on this card. It features 2304 SPUs as well as 192 TAUs and 48 Rasterization Operator Units.

Compare all of that to the Radeon HD 5870, which uses a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM is set to run at a speed of 1200 MHz on this specific card. It features 1600(320x5) SPUs along with 80 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

As far as performance goes, the Geforce GTX 780 should in theory be much better than the Radeon HD 5870 in general. (explain)

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

Texel Rate

The Geforce GTX 780 should be much (more or less 144%) more effective at AF 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 is a lot (about 52%) better at anti-aliasing than the Radeon HD 5870, and should be capable of handling higher resolutions while still performing well. (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

Amazon.com

Radeon HD 5870

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 HD 5870
Manufacturer nVidia AMD
Year May 2013 September 23, 2009
Code Name GK110 Cypress XT
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 3072 MB 1024 MB
Core Speed 863 MHz 850 MHz
Shader Speed 863 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1200 MHz (4800 MHz effective)
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
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2
Power (Max TDP) 250 watts 188 watts
Shader Model 5.0 5.0
Bandwidth 288384 MB/sec 153600 MB/sec
Texel Rate 165696 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 27200 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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