GeForce GT 420 vs GeForce GTX 650 Ti

Intro

Compare those specs to the GeForce GTX 650 Ti, which features core clock speeds of 928 MHz on the GPU, and 1350 MHz on the 1024 MB of GDDR5 memory. It features 768 SPUs along with 64 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 650 Ti		110 Watts
	Difference: 60 Watts (120%)

Memory Bandwidth

In theory, the GeForce GTX 650 Ti is 200% quicker than the GeForce GT 420 overall, because of its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 650 Ti should be a lot (more or less 961%) better at AF than the GeForce GT 420. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 650 Ti is superior to the GeForce GT 420, by a large margin. (explain)

GeForce GTX 650 Ti		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 max amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.