GeForce GT 420 vs Radeon HD 6670 (OEM)

Intro

Compare that to the Radeon HD 6670 (OEM), which comes with a clock frequency of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon HD 6670 (OEM)		63 Watts
	Difference: 13 Watts (26%)

Memory Bandwidth

Performance-wise, the Radeon HD 6670 (OEM) should in theory be quite a bit better than the GeForce GT 420 in general. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 35200 (122%)

Texel Rate

The Radeon HD 6670 (OEM) should be a lot (about 243%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)

Radeon HD 6670 (OEM)		19200 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 13600 (243%)

Pixel Rate

The Radeon HD 6670 (OEM) is much (more or less 129%) better at FSAA than the GeForce GT 420, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6670 (OEM)		6400 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 3600 (129%)

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 data (measured in MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.