GeForce GT 220 GDDR3 vs GeForce GT 420

Intro

Compare that to the GeForce GT 420, which features GPU core speed of 700 MHz, and 2048 MB of GDDR3 RAM running at 900 MHz through a 128-bit bus. It also features 48 Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GT 220 GDDR3		58 Watts
	Difference: 8 Watts (16%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 220 GDDR3 should be a small bit faster than the GeForce GT 420 in general. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 3584 (12%)

Texel Rate

The GeForce GT 220 GDDR3 should be quite a bit (more or less 79%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce GT 220 GDDR3		10000 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 4400 (79%)

Pixel Rate

The GeForce GT 220 GDDR3 is much (approximately 79%) better at anti-aliasing than the GeForce GT 420, and also able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GT 220 GDDR3		5000 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 2200 (79%)

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 transported over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.