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GeForce 8500 GT vs GeForce GT 640 DDR3

Intro

The GeForce 8500 GT makes use of a 80 nm design. nVidia has clocked the core frequency at 450 MHz. The DDR2 memory runs at a frequency of 400 MHz on this card. It features 16 SPUs along with 8 Texture Address Units and 4 ROPs.

Compare that to the GeForce GT 640 DDR3, which comes with 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 Texture Address Units, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

The GeForce GT 640 DDR3 should in theory 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 is much (more or less 700%) faster with regards to 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 is much (approximately 700%) more effective at FSAA than the GeForce 8500 GT, and will be able to handle higher screen resolutions without losing too much performance. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce 8500 GT

Amazon.com

Other US-based stores

GeForce GT 640 DDR3

Amazon.com

Other US-based stores

Specifications

Model GeForce 8500 GT GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year April 2007 June 2012
Code Name G86 GK107
Fab Process 80 nm 28 nm
Bus PCIe x16, PCI, PCIe x16 2.0 PCIe 3.0 x16
Memory 512 MB 2048 MB
Core Speed 450 MHz 900 MHz
Shader Speed 900 MHz 900 MHz
Memory Speed 400 MHz (800 MHz effective) 1782 MHz (3564 MHz effective)
Unified Shaders 16 384
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type DDR2 DDR3
Bus Width 128-bit 128-bit
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2
Power (Max TDP) 45 watts 65 watts
Shader Model 4.0 5.0
Bandwidth 12800 MB/sec 57024 MB/sec
Texel Rate 3600 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 14400 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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