Radeon HD 4730 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which has a core clock frequency of 575 MHz and a GDDR4 memory speed of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
Radeon HD 4730		140 Watts
	Difference: 45 Watts (47%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 4730 is much (about 22%) more effective at AF than the Radeon HD 4830 1GB. (explain)

Radeon HD 4730		22400 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 4000 (22%)

Pixel Rate

The Radeon HD 4830 1GB is a lot (more or less 64%) faster with regards to AA than the Radeon HD 4730, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 3600 (64%)

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 largest amount of data (counted in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount 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 speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.