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GeForce GT 640 DDR3 vs GeForce GTX Titan Black

Intro

The GeForce GT 640 DDR3 has a GPU clock speed of 900 MHz, and the 2048 MB of DDR3 memory runs at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the GeForce GTX Titan Black, which has a clock frequency of 889 MHz and a GDDR5 memory speed of 1750 MHz. It also makes use of a 384-bit memory bus, and uses a 28 nm design. It is made up of 2880 SPUs, 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

In theory, the GeForce GTX Titan Black should be 489% quicker than the GeForce GT 640 DDR3 in general, because of its higher data rate. (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 quite a bit (approximately 641%) more effective 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

If running with high levels of AA is important to you, then the GeForce GTX Titan Black is superior to the GeForce GT 640 DDR3, by a large margin. (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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to 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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