GeForce GT 220 GDDR3 vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which comes with a core clock frequency of 600 MHz and a GDDR3 memory frequency of 700 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 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 1GB		55 Watts
GeForce GT 220 GDDR3		58 Watts
	Difference: 3 Watts (5%)

Memory Bandwidth

Theoretically, the GeForce GT 220 GDDR3 should be a lot faster than the Radeon HD 4650 1GB in general. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 9984 (45%)

Texel Rate

The Radeon HD 4650 1GB will be much (approximately 92%) better at texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 9200 (92%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GT 220 GDDR3 is a better choice, though only just barely. (explain)

GeForce GT 220 GDDR3		5000 Mpixels/sec
Radeon HD 4650 1GB		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 (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling 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 card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.