GeForce 9800 GTX+ vs GeForce GT 420

Intro

Compare all that to the GeForce GT 420, which features GPU clock speed of 700 MHz, and 2048 MB of GDDR3 memory running at 900 MHz through a 128-bit bus. It also is comprised of 48 Stream Processors, 8 TAUs, and 4 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce 9800 GTX+		145 Watts
	Difference: 95 Watts (190%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GTX+ should perform much faster than the GeForce GT 420 overall. (explain)

GeForce 9800 GTX+		70400 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 41600 (144%)

Texel Rate

The GeForce 9800 GTX+ should be quite a bit (more or less 743%) faster with regards to texture filtering than the GeForce GT 420. (explain)

GeForce 9800 GTX+		47232 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 41632 (743%)

Pixel Rate

The GeForce 9800 GTX+ will be a lot (about 322%) more effective at anti-aliasing than the GeForce GT 420, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce 9800 GTX+		11808 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 9008 (322%)

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 data (counted in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.