GeForce GT 420 vs Radeon HD 4670 1GB

Intro

Compare those specs to the Radeon HD 4670 1GB, which comes with a clock frequency of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory frequency of 1100 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 20 Watts (40%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 1GB should in theory be a lot better than the GeForce GT 420 in general. (explain)

Radeon HD 4670 1GB		35200 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 6400 (22%)

Texel Rate

The Radeon HD 4670 1GB will be a lot (approximately 329%) better at AF than the GeForce GT 420. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 18400 (329%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4670 1GB is a better choice, by far. (explain)

Radeon HD 4670 1GB		6000 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 3200 (114%)

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 max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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