GeForce GT 420 vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which comes with a core clock speed of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 650		64 Watts
	Difference: 14 Watts (28%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 should be quite a bit faster than the GeForce GT 420 overall. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 51200 (178%)

Texel Rate

The GeForce GTX 650 should be quite a bit (approximately 505%) better at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 28256 (505%)

Pixel Rate

The GeForce GTX 650 is quite a bit (approximately 505%) faster with regards to full screen anti-aliasing than the GeForce GT 420, and will be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 14128 (505%)

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 MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.