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GeForce 8800 GS vs GeForce GT 640 DDR3

Intro

The GeForce 8800 GS has a clock speed of 550 MHz and a GDDR3 memory speed of 800 MHz. It also features a 192-bit memory bus, and uses a 65 nm design. It is made up of 96 SPUs, 48 TAUs, and 12 ROPs.

Compare those specs to the GeForce GT 640 DDR3, which uses a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 RAM is set to run at a speed of 1782 MHz on this particular model. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce 8800 GS 105 Watts
Difference: 40 Watts (62%)

Memory Bandwidth

The GeForce GT 640 DDR3, in theory, should be a lot faster than the GeForce 8800 GS in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce 8800 GS 38400 MB/sec
Difference: 18624 (49%)

Texel Rate

The GeForce GT 640 DDR3 should be a small bit (about 9%) better at AF than the GeForce 8800 GS. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce 8800 GS 26400 Mtexels/sec
Difference: 2400 (9%)

Pixel Rate

The GeForce GT 640 DDR3 is a lot (about 118%) more effective at full screen anti-aliasing than the GeForce 8800 GS, and also capable of handling higher resolutions without losing too much performance. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 8800 GS 6600 Mpixels/sec
Difference: 7800 (118%)

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 GS

Amazon.com

Check prices at:

GeForce GT 640 DDR3

Amazon.com

Check prices at:

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 GS GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year Jan 2008 June 2012
Code Name G92 GK107
Memory 384 MB 2048 MB
Core Speed 550 MHz 900 MHz
Memory Speed 1600 MHz 3564 MHz
Power (Max TDP) 105 watts 65 watts
Bandwidth 38400 MB/sec 57024 MB/sec
Texel Rate 26400 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 6600 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 384
Texture Mapping Units 48 32
Render Output Units 12 16
Bus Type GDDR3 DDR3
Bus Width 192-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: Memory bandwidth is the max amount of information (counted in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface 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 ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the 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 the video card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. 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 is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8800 GS

Amazon.com

Check prices at:

GeForce GT 640 DDR3

Amazon.com

Check prices at:

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.

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