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GeForce 8500 GT vs GeForce GT 640 DDR3


The GeForce 8500 GT features core speeds of 450 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 RAM. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare those specifications to the GeForce GT 640 DDR3, which features core speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT 45 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 20 Watts (44%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 should be a lot faster than the GeForce 8500 GT overall. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce 8500 GT 12800 MB/sec
Difference: 44224 (346%)

Texel Rate

The GeForce GT 640 DDR3 will be a lot (about 700%) more effective at anisotropic filtering than the GeForce 8500 GT. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 25200 (700%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GT 640 DDR3 is a better choice, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 12600 (700%)

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

Display Prices

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GeForce 8500 GT

GeForce GT 640 DDR3

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.


Display Specifications

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Model GeForce 8500 GT GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year April 2007 June 2012
Code Name G86 GK107
Memory 512 MB 2048 MB
Core Speed 450 MHz 900 MHz
Memory Speed 800 MHz 3564 MHz
Power (Max TDP) 45 watts 65 watts
Bandwidth 12800 MB/sec 57024 MB/sec
Texel Rate 3600 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 16 384
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type DDR2 DDR3
Bus Width 128-bit 128-bit
Fab Process 80 nm 28 nm
Transistors 210 million 1300 million
Bus PCIe x16, PCI, 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 megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.


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