GeForce GT 640 DDR3 vs GeForce GTX 965M

Intro

Compare those specs to the GeForce GTX 965M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 944 MHz. The GDDR5 memory works at a speed of 1000 MHz on this specific model. It features 1024 SPUs along with 64 TAUs and 32 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 965M		5650 points
GeForce GT 640 DDR3		1560 points
	Difference: 4090 (262%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 5 Watts (8%)

Memory Bandwidth

In theory, the GeForce GTX 965M is 12% faster than the GeForce GT 640 DDR3 overall, because of its greater data rate. (explain)

GeForce GTX 965M		64000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 6976 (12%)

Texel Rate

The GeForce GTX 965M is much (approximately 110%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 965M		60416 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 31616 (110%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 965M is the winner, by far. (explain)

GeForce GTX 965M		30208 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 15808 (110%)

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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.