GeForce GT 640 DDR3 vs GeForce GTX 965M

Intro

Compare those specifications to the GeForce GTX 965M, which has a GPU core clock speed of 944 MHz, and 2048 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is comprised of 1024 SPUs, 64 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 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

Theoretically, the GeForce GTX 965M should perform a small bit faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The GeForce GTX 965M should be a lot (about 110%) better at AF 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

The GeForce GTX 965M will be a lot (approximately 110%) more effective at anti-aliasing than the GeForce GT 640 DDR3, and also capable of handling higher resolutions more effectively. (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 maximum amount of data (measured in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video 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 number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.