GeForce GT 640 DDR3 vs Geforce GTX 760

Intro

Compare those specs to the Geforce GTX 760, which has a clock frequency of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1152 SPUs, 96 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 760		5923 points
GeForce GT 640 DDR3		1560 points
	Difference: 4363 (280%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Geforce GTX 760		170 Watts
	Difference: 105 Watts (162%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 760 should theoretically be quite a bit better than the GeForce GT 640 DDR3 in general. (explain)

Geforce GTX 760		192256 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 135232 (237%)

Texel Rate

The Geforce GTX 760 is a lot (about 227%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Geforce GTX 760		94080 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 65280 (227%)

Pixel Rate

The Geforce GTX 760 will be a lot (about 118%) faster with regards to anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher resolutions more effectively. (explain)

Geforce GTX 760		31360 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 16960 (118%)

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 (in units of MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 are processed per second. This 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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