GeForce GT 320 vs Radeon HD 4730

Intro

Compare those specs to the Radeon HD 4730, which comes with a clock frequency of 700 MHz and a GDDR5 memory frequency of 900 MHz. It also features a 128-bit memory bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4730		140 Watts
	Difference: 97 Watts (226%)

Memory Bandwidth

In theory, the Radeon HD 4730 will be 128% quicker than the GeForce GT 320 in general, due to its higher data rate. (explain)

Radeon HD 4730		57600 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 32320 (128%)

Texel Rate

The Radeon HD 4730 should be quite a bit (about 73%) faster with regards to anisotropic filtering than the GeForce GT 320. (explain)

Radeon HD 4730		22400 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 9440 (73%)

Pixel Rate

The Radeon HD 4730 is a lot (approximately 30%) more effective at anti-aliasing than the GeForce GT 320, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4730		5600 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 1280 (30%)

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 information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 potential to reach the max fill rate.