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GeForce 8800 GTS (G92) vs GeForce GT 640 DDR3

Intro

The GeForce 8800 GTS (G92) comes with a core clock speed of 650 MHz and a GDDR3 memory frequency of 970 MHz. It also features a 256-bit bus, and makes use of a 65 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Compare those specs to the GeForce GT 640 DDR3, which makes use of a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 RAM is set to run at a speed of 1782 MHz on this particular card. It features 384 SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce 8800 GTS (G92) 135 Watts
Difference: 70 Watts (108%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G92) should perform a little bit faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce 8800 GTS (G92) 62080 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 5056 (9%)

Texel Rate

The GeForce 8800 GTS (G92) will be much (about 44%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce 8800 GTS (G92) 41600 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 12800 (44%)

Pixel Rate

The GeForce GT 640 DDR3 should be a lot (more or less 38%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G92), and capable of handling higher screen resolutions while still performing well. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 8800 GTS (G92) 10400 Mpixels/sec
Difference: 4000 (38%)

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 GTS (G92)

GeForce GT 640 DDR3

Specifications

Display Specifications

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Model GeForce 8800 GTS (G92) GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year Dec 2007 June 2012
Code Name G92 GK107
Memory 512 MB 2048 MB
Core Speed 650 MHz 900 MHz
Memory Speed 1940 MHz 3564 MHz
Power (Max TDP) 135 watts 65 watts
Bandwidth 62080 MB/sec 57024 MB/sec
Texel Rate 41600 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 10400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 128 384
Texture Mapping Units 64 32
Render Output Units 16 16
Bus Type GDDR3 DDR3
Bus Width 256-bit 128-bit
Fab Process 65 nm 28 nm
Transistors 754 million 1300 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

GeForce 8800 GTS (G92)

GeForce GT 640 DDR3

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