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GeForce GT 640 DDR3 vs GeForce GTX Titan Black

Intro

The GeForce GT 640 DDR3 features core speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the GeForce GTX Titan Black, which has a clock frequency of 889 MHz and a GDDR5 memory speed of 1750 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2880 SPUs, 240 Texture Address Units, 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, the GeForce GTX Titan Black should perform much 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 should be much (about 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

The GeForce GTX Titan Black will be quite a bit (approximately 196%) more effective at AA than the GeForce GT 640 DDR3, and also will be capable of handling higher resolutions more effectively. (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

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.

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 largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability 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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