GeForce GT 220 GDDR3 vs Radeon HD 4870 1GB

Intro

Compare all that to the Radeon HD 4870 1GB, which features core speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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

The Radeon HD 4870 1GB, in theory, should perform a lot 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 is much (about 200%) better at AF 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 the winner, 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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.