GeForce GT 420 vs GeForce GTX 750

Intro

Compare those specifications to the GeForce GTX 750, which comes with a core clock frequency of 1020 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 512 SPUs, 32 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		55 Watts
	Difference: 5 Watts (10%)

Memory Bandwidth

Performance-wise, the GeForce GTX 750 should theoretically be quite a bit better than the GeForce GT 420 overall. (explain)

GeForce GTX 750		80000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 51200 (178%)

Texel Rate

The GeForce GTX 750 should be quite a bit (approximately 483%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTX 750		32640 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 27040 (483%)

Pixel Rate

The GeForce GTX 750 will be a lot (more or less 483%) better at AA than the GeForce GT 420, and should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 750		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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many 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.