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GeForce 8500 GT vs GeForce GT 640 DDR3

Intro

The GeForce 8500 GT comes with a core clock speed of 450 MHz and a DDR2 memory frequency of 400 MHz. It also features a 128-bit memory bus, and makes use of a 80 nm design. It features 16 SPUs, 8 TAUs, and 4 ROPs.

Compare those specifications to the GeForce GT 640 DDR3, which has a clock frequency of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It features 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

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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 quite a bit 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 is quite a bit (approximately 700%) more effective at AF than the GeForce 8500 GT. (explain)

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

Pixel Rate

The GeForce GT 640 DDR3 should be a lot (about 700%) better at anti-aliasing than the GeForce 8500 GT, and will be capable of handling higher screen resolutions more effectively. (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

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GeForce 8500 GT

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 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: Bandwidth is the largest amount of data (counted in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has 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 higher screen resolutions.

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

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