GeForce GT 640 DDR3 vs GeForce GTX 950

Intro

Compare those specs to the GeForce GTX 950, which comes with a core clock speed of 1024 MHz and a GDDR5 memory frequency of 1652 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 768 SPUs, 48 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 950		6536 points
GeForce GT 640 DDR3		1560 points
	Difference: 4976 (319%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 950		90 Watts
	Difference: 25 Watts (38%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 950 should theoretically be a lot better than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 950		105728 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 48704 (85%)

Texel Rate

The GeForce GTX 950 is much (about 71%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 950		49152 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 20352 (71%)

Pixel Rate

The GeForce GTX 950 should be much (approximately 128%) more effective at AA than the GeForce GT 640 DDR3, and also will be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 950		32768 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 18368 (128%)

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 (measured in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied 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 worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.