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GeForce GT 640 DDR3 vs GeForce GTX Titan Black

Intro

The GeForce GT 640 DDR3 features a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 memory is set to run at 1782 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 TAUs, and 16 ROPs.

Compare those specifications to the GeForce GTX Titan Black, which uses a 28 nm design. nVidia has clocked the core frequency at 889 MHz. The GDDR5 RAM is set to run at a frequency of 1750 MHz on this specific card. It features 2880 SPUs along with 240 Texture Address Units and 48 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 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 will be 489% faster than the GeForce GT 640 DDR3 overall, because of its greater 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 should be a lot (approximately 641%) better at AF 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 is a lot (about 196%) faster with regards to AA than the GeForce GT 640 DDR3, and also able to handle higher screen resolutions better. (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 information (measured in MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max 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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