GeForce GT 420 vs GeForce GT 450 (OEM)

Intro

Compare all that to the GeForce GT 450 (OEM), which features a GPU core clock speed of 790 MHz, and 1536 MB of GDDR5 memory running at 1000 MHz through a 192-bit bus. It also is made up of 144 SPUs, 24 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The GeForce GT 450 (OEM) should in theory be much faster than the GeForce GT 420 in general. (explain)

GeForce GT 450 (OEM)		96000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 67200 (233%)

Texel Rate

The GeForce GT 450 (OEM) should be much (approximately 239%) faster with regards to AF than the GeForce GT 420. (explain)

GeForce GT 450 (OEM)		18960 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 13360 (239%)

Pixel Rate

The GeForce GT 450 (OEM) is much (approximately 577%) better at AA than the GeForce GT 420, and should be capable of handling higher resolutions more effectively. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 16160 (577%)

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 max amount of information (counted in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 are applied in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.