GeForce GT 220 GDDR3 vs Radeon HD 4650 512MB

Intro

Compare that to the Radeon HD 4650 512MB, which makes use of a 55 nm design. AMD has clocked the core frequency at 600 MHz. The DDR2 RAM runs at a speed of 500 MHz on this specific model. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GT 220 GDDR3		58 Watts
	Difference: 3 Watts (5%)

Memory Bandwidth

The GeForce GT 220 GDDR3, in theory, should perform much faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 16384 (102%)

Texel Rate

The Radeon HD 4650 512MB will be quite a bit (more or less 92%) more effective at AF than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 9200 (92%)

Pixel Rate

The GeForce GT 220 GDDR3 is a bit (approximately 4%) better at AA than the Radeon HD 4650 512MB, and also should be able to handle higher resolutions better. (explain)

GeForce GT 220 GDDR3		5000 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 200 (4%)

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 max amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 applied per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.