GeForce GT 220 GDDR3 vs Radeon HD 4870 1GB

Intro

Compare all that to the Radeon HD 4870 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory works at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 92 Watts (159%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 1GB should in theory be a lot superior to the GeForce GT 220 GDDR3 overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 82816 (256%)

Texel Rate

The Radeon HD 4870 1GB should be much (approximately 200%) faster with regards to texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 20000 (200%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4870 1GB is a better choice, by a large margin. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 7000 (140%)

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 data (counted in MB per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.