GeForce GTX 650 vs Geforce GTX 680

Intro

Compare those specifications to the Geforce GTX 680, which uses a 28 nm design. nVidia has set the core speed at 1006 MHz. The GDDR5 memory works at a speed of 1502 MHz on this particular card. It features 1536 SPUs along with 128 Texture Address Units 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 680		7650 points
GeForce GTX 650		2263 points
	Difference: 5387 (238%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Geforce GTX 680		195 Watts
	Difference: 131 Watts (205%)

Memory Bandwidth

Theoretically, the Geforce GTX 680 should perform a lot faster than the GeForce GTX 650 in general. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 112256 (140%)

Texel Rate

The Geforce GTX 680 should be quite a bit (approximately 280%) more effective at AF than the GeForce GTX 650. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 94912 (280%)

Pixel Rate

The Geforce GTX 680 should be much (approximately 90%) faster with regards to anti-aliasing than the GeForce GTX 650, and also should be capable of handling higher screen resolutions without slowing down too much. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 15264 (90%)

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 largest amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 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, High Dynamic Range and high 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 of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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