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GeForce GT 640 DDR3 vs GeForce GTX 960

Intro

The GeForce GT 640 DDR3 has core speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 32 TAUs and 16 ROPs.

Compare all that to the GeForce GTX 960, which has core clock speeds of 1127 MHz on the GPU, and 1750 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

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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 960 7627 points
GeForce GT 640 DDR3 1560 points
Difference: 6067 (389%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTX 960 120 Watts
Difference: 55 Watts (85%)

Memory Bandwidth

In theory, the GeForce GTX 960 should perform a lot faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 960 112000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 54976 (96%)

Texel Rate

The GeForce GTX 960 will be much (about 150%) faster with regards to AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 960 72128 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 43328 (150%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 960 is a better choice, by a large margin. (explain)

GeForce GTX 960 36064 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 21664 (150%)

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 960

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 960
Manufacturer nVidia nVidia
Year June 2012 January 2015
Code Name GK107 GM206
Memory 2048 MB 2048 MB
Core Speed 900 MHz 1127 MHz
Memory Speed 3564 MHz 7000 MHz
Power (Max TDP) 65 watts 120 watts
Bandwidth 57024 MB/sec 112000 MB/sec
Texel Rate 28800 Mtexels/sec 72128 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 36064 Mpixels/sec
Unified Shaders 384 1024
Texture Mapping Units 32 64
Render Output Units 16 32
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 1300 million 2940 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 12.0
OpenGL Version OpenGL 4.2 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTX 960

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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