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GeForce 8800 GTS (G92) vs GeForce GT 640 DDR3

Intro

The GeForce 8800 GTS (G92) comes with core speeds of 650 MHz on the GPU, and 970 MHz on the 512 MB of GDDR3 memory. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Compare those specs to the GeForce GT 640 DDR3, which comes with GPU clock speed of 900 MHz, and 2048 MB of DDR3 RAM set to run at 1782 MHz through a 128-bit bus. It also is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

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

The GeForce 8800 GTS (G92), in theory, should be just a bit faster than the GeForce GT 640 DDR3 in general. (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 quite a bit (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 will be a lot (more or less 38%) more effective at FSAA than the GeForce 8800 GTS (G92), and capable of handling higher resolutions without losing too much performance. (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

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GeForce 8800 GTS (G92)

Amazon.com

GeForce GT 640 DDR3

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

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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
Fab Process 65 nm 28 nm
Bus PCIe x16 2.0 PCIe 3.0 x16
Memory 512 MB 2048 MB
Core Speed 650 MHz 900 MHz
Shader Speed 1625 MHz 900 MHz
Memory Speed 970 MHz (1940 MHz effective) 1782 MHz (3564 MHz effective)
Unified Shaders 128 384
Texture Mapping Units 64 32
Render Output Units 16 16
Bus Type GDDR3 DDR3
Bus Width 256-bit 128-bit
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.2
Power (Max TDP) 135 watts 65 watts
Shader Model 4.0 5.0
Bandwidth 62080 MB/sec 57024 MB/sec
Texel Rate 41600 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 10400 Mpixels/sec 14400 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at 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 the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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