GeForce GT 420 vs GeForce GTX 465

Intro

Compare those specs to the GeForce GTX 465, which has GPU core speed of 607 MHz, and 1024 MB of GDDR5 memory set to run at 802 MHz through a 256-bit bus. It also features 352 SPUs, 44 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 465		200 Watts
	Difference: 150 Watts (300%)

Memory Bandwidth

The GeForce GTX 465 should in theory perform quite a bit faster than the GeForce GT 420 overall. (explain)

GeForce GTX 465		102592 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 73792 (256%)

Texel Rate

The GeForce GTX 465 will be much (about 377%) better at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 465		26708 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 21108 (377%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 465 is a better choice, by far. (explain)

GeForce GTX 465		19424 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 16624 (594%)

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 largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

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