GeForce GT 220 GDDR3 vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which comes with core speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 RAM. It features 320(64x5) SPUs along with 32 Texture Address Units 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

As far as performance goes, the GeForce GT 220 GDDR3 should theoretically be much superior to the Radeon HD 4650 512MB overall. (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 (about 92%) better at anisotropic filtering 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 should be a bit (approximately 4%) better at FSAA than the Radeon HD 4650 512MB, and able to handle higher resolutions while still performing well. (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 largest amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling 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 write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.