GeForce GT 420 vs GeForce GTX 950

Intro

Compare those specifications to the GeForce GTX 950, which features a core clock frequency of 1024 MHz and a GDDR5 memory frequency of 1652 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 768 SPUs, 48 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 950		90 Watts
	Difference: 40 Watts (80%)

Memory Bandwidth

In theory, the GeForce GTX 950 will be 267% faster than the GeForce GT 420 overall, due to its higher bandwidth. (explain)

GeForce GTX 950		105728 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 76928 (267%)

Texel Rate

The GeForce GTX 950 will be quite a bit (approximately 778%) faster with regards to texture filtering than the GeForce GT 420. (explain)

GeForce GTX 950		49152 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 43552 (778%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 950 is the winner, and very much so. (explain)

GeForce GTX 950		32768 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 29968 (1070%)

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 largest amount of information (measured in MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units 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 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 ability to reach the maximum fill rate.