GeForce GT 420 vs GeForce GTX 950

Intro

Compare those specifications to the GeForce GTX 950, which makes use of a 28 nm design. nVidia has clocked the core speed at 1024 MHz. The GDDR5 memory is set to run at a speed of 1652 MHz on this specific card. It features 768 SPUs along with 48 Texture Address Units and 32 Rasterization Operator Units.

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

The GeForce GTX 950 should theoretically be quite a bit faster than the GeForce GT 420 in general. (explain)

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

Texel Rate

The GeForce GTX 950 will be a lot (about 778%) more effective at 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 using high levels of AA is important to you, then the GeForce GTX 950 is superior to the GeForce GT 420, by a large margin. (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 maximum amount of data (measured in MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 can be processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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