GeForce GT 220 GDDR3 vs Radeon HD 4870 1GB

Intro

Compare those specifications to the Radeon HD 4870 1GB, which uses a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory works at a speed of 900 MHz on this 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

Theoretically, the Radeon HD 4870 1GB should perform quite a bit faster than 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 (about 200%) better at 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 using a high screen resolution is important to you, then the Radeon HD 4870 1GB is superior to the GeForce GT 220 GDDR3, and very much so. (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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.