GeForce GTX 650 vs Geforce GTX 780

Intro

Compare those specifications to the Geforce GTX 780, which comes with clock speeds of 863 MHz on the GPU, and 1502 MHz on the 3072 MB of GDDR5 RAM. It features 2304 SPUs as well as 192 Texture Address Units and 48 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 780		10082 points
GeForce GTX 650		2263 points
	Difference: 7819 (346%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Geforce GTX 780		250 Watts
	Difference: 186 Watts (291%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 will be 260% quicker than the GeForce GTX 650 overall, due to its greater bandwidth. (explain)

Geforce GTX 780		288384 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 208384 (260%)

Texel Rate

The Geforce GTX 780 is much (approximately 389%) more effective at AF than the GeForce GTX 650. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 131840 (389%)

Pixel Rate

The Geforce GTX 780 will be much (more or less 145%) more effective at full screen anti-aliasing than the GeForce GTX 650, and also capable of handling higher resolutions without slowing down too much. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 24496 (145%)

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 (in units of MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.