GeForce GT 640 DDR3 vs GeForce GTX Titan Black

Intro

Compare those specifications to the GeForce GTX Titan Black, which makes use of a 28 nm design. nVidia has clocked the core speed at 889 MHz. The GDDR5 RAM is set to run at a speed of 1750 MHz on this particular card. It features 2880 SPUs along with 240 Texture Address Units and 48 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

The GeForce GTX Titan Black should in theory be much faster than the GeForce GT 640 DDR3 in general. (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 is quite a bit (about 641%) more effective at texture 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 using a high resolution is important to you, then the GeForce GTX Titan Black is the winner, 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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.