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GeForce GT 640 DDR3 vs GeForce GTX Titan Black

Intro

The GeForce GT 640 DDR3 features a core clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also features a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare that to the GeForce GTX Titan Black, which uses a 28 nm design. nVidia has clocked the core speed at 889 MHz. The GDDR5 memory is set to run at a speed of 1750 MHz on this specific model. It features 2880 SPUs along with 240 TAUs and 48 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 Titan Black 11666 points
GeForce GT 640 DDR3 1560 points
Difference: 10106 (648%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTX Titan Black 250 Watts
Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX Titan Black should be quite a bit faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX Titan Black 336000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 278976 (489%)

Texel Rate

The GeForce GTX Titan Black will be much (approximately 641%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX Titan Black 213360 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 184560 (641%)

Pixel Rate

The GeForce GTX Titan Black should be quite a bit (approximately 196%) faster with regards to FSAA than the GeForce GT 640 DDR3, and able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX Titan Black 42672 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 28272 (196%)

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 Titan Black

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 Titan Black
Manufacturer nVidia nVidia
Year June 2012 February 2014
Code Name GK107 GK110-430
Memory 2048 MB 6144 MB
Core Speed 900 MHz 889 MHz
Memory Speed 3564 MHz 7000 MHz
Power (Max TDP) 65 watts 250 watts
Bandwidth 57024 MB/sec 336000 MB/sec
Texel Rate 28800 Mtexels/sec 213360 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 42672 Mpixels/sec
Unified Shaders 384 2880
Texture Mapping Units 32 240
Render Output Units 16 48
Bus Type DDR3 GDDR5
Bus Width 128-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 1300 million 7080 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.0
OpenGL Version OpenGL 4.2 OpenGL 4.4

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed 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 the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTX Titan Black

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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