GeForce GT 420 vs GeForce GTX 960

Intro

Compare that to the GeForce GTX 960, which features core speeds of 1127 MHz on the GPU, and 1750 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs as well as 64 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 960		120 Watts
	Difference: 70 Watts (140%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 960 should in theory be much better than the GeForce GT 420 overall. (explain)

GeForce GTX 960		112000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 83200 (289%)

Texel Rate

The GeForce GTX 960 is a lot (more or less 1188%) better at AF than the GeForce GT 420. (explain)

GeForce GTX 960		72128 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 66528 (1188%)

Pixel Rate

The GeForce GTX 960 is much (about 1188%) faster with regards to full screen anti-aliasing than the GeForce GT 420, and able to handle higher screen resolutions better. (explain)

GeForce GTX 960		36064 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 33264 (1188%)

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 maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 are applied in one second. This number is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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