GeForce GT 420 vs GeForce GTS 450

Intro

Compare those specifications to the GeForce GTS 450, which features a core clock speed of 783 MHz and a GDDR5 memory speed of 902 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It features 192 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTS 450		106 Watts
	Difference: 56 Watts (112%)

Memory Bandwidth

The GeForce GTS 450 should theoretically be quite a bit faster than the GeForce GT 420 overall. (explain)

GeForce GTS 450		57728 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 28928 (100%)

Texel Rate

The GeForce GTS 450 will be quite a bit (about 347%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce GTS 450		25056 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 19456 (347%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTS 450 is superior to the GeForce GT 420, and very much so. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 9728 (347%)

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 information (measured in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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