GeForce 9800 GTX+ vs GeForce GT 420

Intro

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

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

Performance-wise, the GeForce 9800 GTX+ should theoretically be quite a bit better 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+ will be much (more or less 743%) more effective at anisotropic 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 quite a bit (more or less 322%) better at full screen anti-aliasing than the GeForce GT 420, and also should be capable of handling higher screen resolutions better. (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 maximum amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at 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 can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.