GeForce GT 220 GDDR3 vs Radeon HD 4670 1GB

Intro

Compare that to the Radeon HD 4670 1GB, which comes with clock speeds of 750 MHz on the GPU, and 1100 MHz on the 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 12 Watts (21%)

Memory Bandwidth

In theory, the Radeon HD 4670 1GB is 9% faster than the GeForce GT 220 GDDR3 overall, due to its greater bandwidth. (explain)

Radeon HD 4670 1GB		35200 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 2816 (9%)

Texel Rate

The Radeon HD 4670 1GB is a lot (about 140%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 14000 (140%)

Pixel Rate

The Radeon HD 4670 1GB should be a bit (more or less 20%) faster with regards to full screen anti-aliasing than the GeForce GT 220 GDDR3, and also will be able to handle higher resolutions better. (explain)

Radeon HD 4670 1GB		6000 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 1000 (20%)

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 (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock 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 fill 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.