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GeForce 9800 GTX+ vs GeForce GT 640 DDR3

Intro

The GeForce 9800 GTX+ comes with a clock speed of 738 MHz and a GDDR3 memory frequency of 1100 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It features 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the GeForce GT 640 DDR3, which features a core clock frequency of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also uses a 128-bit memory 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 GT 640 DDR3 65 Watts
GeForce 9800 GTX+ 145 Watts
Difference: 80 Watts (123%)

Memory Bandwidth

Theoretically, the GeForce 9800 GTX+ should be quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce 9800 GTX+ 70400 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 13376 (23%)

Texel Rate

The GeForce 9800 GTX+ should be quite a bit (about 64%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce 9800 GTX+ 47232 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 18432 (64%)

Pixel Rate

The GeForce GT 640 DDR3 will be much (about 22%) faster with regards to FSAA than the GeForce 9800 GTX+, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 9800 GTX+ 11808 Mpixels/sec
Difference: 2592 (22%)

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 9800 GTX+

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 9800 GTX+ GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year July 2008 June 2012
Code Name G92b GK107
Memory 512 MB 2048 MB
Core Speed 738 MHz 900 MHz
Memory Speed 2200 MHz 3564 MHz
Power (Max TDP) 145 watts 65 watts
Bandwidth 70400 MB/sec 57024 MB/sec
Texel Rate 47232 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 128 384
Texture Mapping Units 64 32
Render Output Units 16 16
Bus Type GDDR3 DDR3
Bus Width 256-bit 128-bit
Fab Process 55 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 maximum amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 9800 GTX+

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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