GeForce GT 320 vs Radeon HD 4650 1GB

Intro

Compare that to the Radeon HD 4650 1GB, which comes with a GPU core clock speed of 600 MHz, and 1024 MB of GDDR3 memory running at 700 MHz through a 128-bit bus. It also is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 12 Watts (28%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 320 will be 13% quicker than the Radeon HD 4650 1GB overall, due to its greater data rate. (explain)

GeForce GT 320		25280 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 2880 (13%)

Texel Rate

The Radeon HD 4650 1GB will be a lot (more or less 48%) better at AF than the GeForce GT 320. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 6240 (48%)

Pixel Rate

The Radeon HD 4650 1GB should be a bit (approximately 11%) better at anti-aliasing than the GeForce GT 320, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 480 (11%)

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 max amount of data (in units of MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, 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 amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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.