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GeForce 8800 GTX vs Geforce GTX 680


Intro

The GeForce 8800 GTX comes with a GPU clock speed of 575 MHz, and the 768 MB of GDDR3 RAM runs at 900 MHz through a 384-bit bus. It also is comprised of 128 Stream Processors, 64 Texture Address Units, and 24 ROPs.

Compare all of that to the Geforce GTX 680, which comes with clock speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTX 155 Watts
Geforce GTX 680 195 Watts
Difference: 40 Watts (26%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should theoretically be quite a bit superior to the GeForce 8800 GTX overall. (explain)

Geforce GTX 680 192256 MB/sec
GeForce 8800 GTX 86400 MB/sec
Difference: 105856 (123%)

Texel Rate

The Geforce GTX 680 should be much (about 250%) faster with regards to anisotropic filtering than the GeForce 8800 GTX. (explain)

Geforce GTX 680 128768 Mtexels/sec
GeForce 8800 GTX 36800 Mtexels/sec
Difference: 91968 (250%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 680 is superior to the GeForce 8800 GTX, by far. (explain)

Geforce GTX 680 32192 Mpixels/sec
GeForce 8800 GTX 13800 Mpixels/sec
Difference: 18392 (133%)

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 8800 GTX

Geforce GTX 680

Specifications

Display Specifications

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Model GeForce 8800 GTX Geforce GTX 680
Manufacturer nVidia nVidia
Year Nov 2006 March 2012
Code Name G80 GK104
Memory 768 MB 2048 MB
Core Speed 575 MHz 1006 MHz
Memory Speed 1800 MHz 6008 MHz
Power (Max TDP) 155 watts 195 watts
Bandwidth 86400 MB/sec 192256 MB/sec
Texel Rate 36800 Mtexels/sec 128768 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 32192 Mpixels/sec
Unified Shaders 128 1536
Texture Mapping Units 64 128
Render Output Units 24 32
Bus Type GDDR3 GDDR5
Bus Width 384-bit 256-bit
Fab Process 90 nm 28 nm
Transistors 681 million 3540 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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 potential to get to the max fill rate.

GeForce 8800 GTX

Geforce GTX 680

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