GeForce GT 420 vs GeForce GTX 650 Ti 2GB

Intro

Compare those specifications to the GeForce GTX 650 Ti 2GB, which uses a 28 nm design. nVidia has set the core frequency at 928 MHz. The GDDR5 RAM runs at a speed of 1350 MHz on this particular model. It features 768 SPUs as well as 64 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 GTX 650 Ti 2GB		110 Watts
	Difference: 60 Watts (120%)

Memory Bandwidth

Theoretically, the GeForce GTX 650 Ti 2GB should be much faster than the GeForce GT 420 in general. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 57600 (200%)

Texel Rate

The GeForce GTX 650 Ti 2GB will be much (approximately 961%) better at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 53792 (961%)

Pixel Rate

The GeForce GTX 650 Ti 2GB is much (more or less 430%) better at anti-aliasing than the GeForce GT 420, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 12048 (430%)

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 data (in units of MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount 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 rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.