GeForce GT 420 vs GeForce GTS 450

Intro

Compare all that to the GeForce GTS 450, which uses a 40 nm design. nVidia has set the core frequency at 783 MHz. The GDDR5 RAM runs at a speed of 902 MHz on this card. It features 192 SPUs as well as 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 GTS 450		106 Watts
	Difference: 56 Watts (112%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 450 is 100% quicker than the GeForce GT 420 in general, due to its higher data rate. (explain)

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

Texel Rate

The GeForce GTS 450 should be quite a bit (approximately 347%) better 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

The GeForce GTS 450 should be quite a bit (approximately 347%) better at FSAA than the GeForce GT 420, and will be capable of handling higher resolutions better. (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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, the result should 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, 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 number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.