GeForce GT 640 DDR3 vs GeForce GTX Titan

Intro

Compare those specifications to the GeForce GTX Titan, which comes with core speeds of 837 MHz on the GPU, and 1502 MHz on the 6144 MB of GDDR5 RAM. It features 2688 SPUs along with 224 Texture Address Units and 48 Rasterization Operator Units.

Display Graphs

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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		10162 points
GeForce GT 640 DDR3		1560 points
	Difference: 8602 (551%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the GeForce GTX Titan will be 406% faster than the GeForce GT 640 DDR3 overall, due to its higher data rate. (explain)

GeForce GTX Titan		288384 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 231360 (406%)

Texel Rate

The GeForce GTX Titan should be quite a bit (more or less 551%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX Titan		187488 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 158688 (551%)

Pixel Rate

The GeForce GTX Titan will be quite a bit (approximately 179%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and will be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX Titan		40176 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 25776 (179%)

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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If 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 high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video 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 number of pixels the video card could possibly record to the 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 card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.