GeForce GT 640 DDR3 vs Geforce GTX 690

Intro

Compare that to the Geforce GTX 690, which uses a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 memory is set to run at a speed of 1502 MHz on this model. It features 1536 SPUs as well as 128 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 690		13111 points
GeForce GT 640 DDR3		1560 points
	Difference: 11551 (740%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Geforce GTX 690		300 Watts
	Difference: 235 Watts (362%)

Memory Bandwidth

Performance-wise, the Geforce GTX 690 should theoretically be a lot superior to the GeForce GT 640 DDR3 in general. (explain)

Geforce GTX 690		384512 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 327488 (574%)

Texel Rate

The Geforce GTX 690 should be a lot (approximately 713%) faster with regards to AF than the GeForce GT 640 DDR3. (explain)

Geforce GTX 690		234240 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 205440 (713%)

Pixel Rate

If using a high screen resolution is important to you, then the Geforce GTX 690 is the winner, and very much so. (explain)

Geforce GTX 690		58560 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 44160 (307%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.