GeForce GT 420 vs GeForce GTX 780 Ti

Intro

Compare all that to the GeForce GTX 780 Ti, which has a core clock frequency of 875 MHz and a GDDR5 memory speed of 1750 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It features 2880 SPUs, 240 Texture Address Units, and 48 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 780 Ti		250 Watts
	Difference: 200 Watts (400%)

Memory Bandwidth

Performance-wise, the GeForce GTX 780 Ti should in theory be quite a bit superior to the GeForce GT 420 in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 307200 (1067%)

Texel Rate

The GeForce GTX 780 Ti should be a lot (about 3650%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 204400 (3650%)

Pixel Rate

The GeForce GTX 780 Ti is quite a bit (more or less 1400%) more effective at AA than the GeForce GT 420, and capable of handling higher resolutions better. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 39200 (1400%)

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 largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, 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 processed per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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