GeForce GT 640 DDR3 vs GeForce GTX 980 Ti

Intro

Compare those specs to the GeForce GTX 980 Ti, which uses a 28 nm design. nVidia has clocked the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1750 MHz on this particular model. It features 2816 SPUs along with 176 TAUs and 96 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 980 Ti		17120 points
GeForce GT 640 DDR3		1560 points
	Difference: 15560 (997%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 980 Ti		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980 Ti should perform much faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 980 Ti		336000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 278976 (489%)

Texel Rate

The GeForce GTX 980 Ti will be quite a bit (approximately 511%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 980 Ti		176000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 147200 (511%)

Pixel Rate

The GeForce GTX 980 Ti is much (more or less 567%) better at anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher resolutions better. (explain)

GeForce GTX 980 Ti		96000 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 81600 (567%)

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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units 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 per second.

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