GeForce GT 420 vs Geforce GTX 670

Intro

Compare all of that to the Geforce GTX 670, which features a GPU core clock speed of 915 MHz, and 2048 MB of GDDR5 RAM running at 1500 MHz through a 256-bit bus. It also features 1344 Stream Processors, 112 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Geforce GTX 670		170 Watts
	Difference: 120 Watts (240%)

Memory Bandwidth

Performance-wise, the Geforce GTX 670 should in theory be a lot better than the GeForce GT 420 overall. (explain)

Geforce GTX 670		192000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 163200 (567%)

Texel Rate

The Geforce GTX 670 will be much (approximately 1730%) faster with regards to texture filtering than the GeForce GT 420. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 96880 (1730%)

Pixel Rate

If running with a high resolution is important to you, then the Geforce GTX 670 is the winner, by a large margin. (explain)

Geforce GTX 670		29280 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 26480 (946%)

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 largest amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, 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 graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.