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GeForce 9800 GTX vs GeForce GT 640 DDR3

Intro

The GeForce 9800 GTX features core speeds of 675 MHz on the GPU, and 1100 MHz on the 512 MB of GDDR3 memory. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Compare that to the GeForce GT 640 DDR3, which comes with GPU clock speed of 900 MHz, and 2048 MB of DDR3 memory set to run at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce 9800 GTX 140 Watts
Difference: 75 Watts (115%)

Memory Bandwidth

In theory, the GeForce 9800 GTX should be 23% faster than the GeForce GT 640 DDR3 overall, due to its higher data rate. (explain)

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

Texel Rate

The GeForce 9800 GTX is quite a bit (more or less 50%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce 9800 GTX 43200 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 14400 (50%)

Pixel Rate

The GeForce GT 640 DDR3 should be quite a bit (approximately 33%) more effective at anti-aliasing than the GeForce 9800 GTX, and will be able to handle higher resolutions more effectively. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 9800 GTX 10800 Mpixels/sec
Difference: 3600 (33%)

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 April 2008 June 2012
Code Name G92 GK107
Memory 512 MB 2048 MB
Core Speed 675 MHz 900 MHz
Memory Speed 2200 MHz 3564 MHz
Power (Max TDP) 140 watts 65 watts
Bandwidth 70400 MB/sec 57024 MB/sec
Texel Rate 43200 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 10800 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 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 largest amount of data (measured in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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

Display Prices

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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.

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