GeForce GT 420 vs GeForce GTX 750 Ti

Intro

Compare all of that to the GeForce GTX 750 Ti, which uses a 28 nm design. nVidia has set the core speed at 1020 MHz. The GDDR5 RAM runs at a speed of 1350 MHz on this specific card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 750 Ti		60 Watts
	Difference: 10 Watts (20%)

Memory Bandwidth

The GeForce GTX 750 Ti should theoretically be much faster than the GeForce GT 420 overall. (explain)

GeForce GTX 750 Ti		86400 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 57600 (200%)

Texel Rate

The GeForce GTX 750 Ti will be quite a bit (more or less 629%) better at anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 35200 (629%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 750 Ti is the winner, and very much so. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 13520 (483%)

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 max amount of information (counted in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.