GeForce GT 640 DDR3 vs GeForce GTX 950

Intro

Compare that to the GeForce GTX 950, which features GPU core speed of 1024 MHz, and 2048 MB of GDDR5 RAM set to run at 1652 MHz through a 128-bit bus. It also is made up of 768 Stream Processors, 48 TAUs, 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

Theoretically, the GeForce GTX 950 should perform quite a bit faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The GeForce GTX 950 should be quite a bit (about 71%) more effective at anisotropic 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 (about 128%) better at full screen anti-aliasing than the GeForce GT 640 DDR3, and also able to handle higher screen resolutions while still performing well. (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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.