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GeForce GT 640 DDR3 vs GeForce GTX 980

Intro

The GeForce GT 640 DDR3 has a core clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare those specs to the GeForce GTX 980, which comes with GPU clock speed of 1126 MHz, and 4096 MB of GDDR5 memory running at 1750 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 64 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 980 13552 points
GeForce GT 640 DDR3 1560 points
Difference: 11992 (769%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTX 980 165 Watts
Difference: 100 Watts (154%)

Memory Bandwidth

In theory, the GeForce GTX 980 should be a lot faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 980 224000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 166976 (293%)

Texel Rate

The GeForce GTX 980 should be much (approximately 400%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 980 144128 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 115328 (400%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 980 is a better choice, and very much so. (explain)

GeForce GTX 980 72064 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 57664 (400%)

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 GT 640 DDR3

Amazon.com

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GeForce GTX 980

Amazon.com

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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 GT 640 DDR3 GeForce GTX 980
Manufacturer nVidia nVidia
Year June 2012 September 2014
Code Name GK107 GM204-400
Memory 2048 MB 4096 MB
Core Speed 900 MHz 1126 MHz
Memory Speed 3564 MHz 7000 MHz
Power (Max TDP) 65 watts 165 watts
Bandwidth 57024 MB/sec 224000 MB/sec
Texel Rate 28800 Mtexels/sec 144128 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 72064 Mpixels/sec
Unified Shaders 384 2048
Texture Mapping Units 32 128
Render Output Units 16 64
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 1300 million 5200 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTX 980

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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