GeForce GT 420 vs GeForce GTX 260 Core 216

Intro

Compare those specifications to the GeForce GTX 260 Core 216, which features a core clock speed of 576 MHz and a GDDR3 memory speed of 999 MHz. It also makes use of a 448-bit bus, and uses a 65 nm design. It is comprised of 216 SPUs, 72 TAUs, and 28 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 260 Core 216		202 Watts
	Difference: 152 Watts (304%)

Memory Bandwidth

The GeForce GTX 260 Core 216 should theoretically perform quite a bit faster than the GeForce GT 420 overall. (explain)

GeForce GTX 260 Core 216		111888 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 83088 (289%)

Texel Rate

The GeForce GTX 260 Core 216 should be a lot (about 641%) better at anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTX 260 Core 216		41472 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 35872 (641%)

Pixel Rate

The GeForce GTX 260 Core 216 is much (about 476%) faster with regards to FSAA than the GeForce GT 420, and also able to handle higher resolutions better. (explain)

GeForce GTX 260 Core 216		16128 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 13328 (476%)

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 largest amount of information (in units of megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to 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 potential to reach the max fill rate.