GeForce GT 640 DDR3 vs GeForce GTX 960

Intro

Compare all that to the GeForce GTX 960, which uses a 28 nm design. nVidia has set the core frequency at 1127 MHz. The GDDR5 memory runs at a speed of 1750 MHz on this card. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

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 960		7627 points
GeForce GT 640 DDR3		1560 points
	Difference: 6067 (389%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 960		120 Watts
	Difference: 55 Watts (85%)

Memory Bandwidth

Performance-wise, the GeForce GTX 960 should theoretically be quite a bit better than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 960		112000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 54976 (96%)

Texel Rate

The GeForce GTX 960 should be a lot (about 150%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 960		72128 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 43328 (150%)

Pixel Rate

The GeForce GTX 960 is a lot (about 150%) better at anti-aliasing than the GeForce GT 640 DDR3, and also should be able to handle higher screen resolutions better. (explain)

GeForce GTX 960		36064 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 21664 (150%)

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 information (in units of 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. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.