GeForce GT 640 DDR3 vs Geforce GTX 760

Intro

Compare those specifications to the Geforce GTX 760, which comes with clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 1152 SPUs along with 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 overall. (explain)

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

Texel Rate

The Geforce GTX 760 should be a lot (more or less 227%) better 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 is much (about 118%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and should be capable of handling higher resolutions without slowing down too much. (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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 ability to get to the maximum fill rate.