GeForce GT 420 vs GeForce GTS 450

Intro

Compare that to the GeForce GTS 450, which features clock speeds of 783 MHz on the GPU, and 902 MHz on the 512 MB of GDDR5 RAM. It features 192 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

As far as performance goes, the GeForce GTS 450 should in theory be quite a bit better than the GeForce GT 420 in general. (explain)

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

Texel Rate

The GeForce GTS 450 will be a lot (about 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

If using a high resolution is important to you, then the GeForce GTS 450 is the winner, by far. (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 (counted in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.