GeForce GT 420 vs GeForce GTX 285 2GB

Intro

Compare those specifications to the GeForce GTX 285 2GB, which comes with a core clock speed of 648 MHz and a GDDR3 memory frequency of 1242 MHz. It also makes use of a 512-bit memory bus, and uses a 55 nm design. It features 240 SPUs, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 154 Watts (308%)

Memory Bandwidth

Performance-wise, the GeForce GTX 285 2GB should in theory be quite a bit better than the GeForce GT 420 in general. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 130176 (452%)

Texel Rate

The GeForce GTX 285 2GB will be a lot (about 826%) better at AF than the GeForce GT 420. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 46240 (826%)

Pixel Rate

The GeForce GTX 285 2GB is a lot (about 641%) more effective at full screen anti-aliasing than the GeForce GT 420, and should be able to handle higher screen resolutions better. (explain)

GeForce GTX 285 2GB		20736 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 17936 (641%)

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 maximum amount of data (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.