Radeon HD 4730 vs Radeon HD 4850 1GB

Intro

Compare that to the Radeon HD 4850 1GB, which comes with clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 1GB		110 Watts
Radeon HD 4730		140 Watts
	Difference: 30 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 4850 1GB should be 10% quicker than the Radeon HD 4730 in general, due to its greater bandwidth. (explain)

Radeon HD 4850 1GB		63552 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 5952 (10%)

Texel Rate

The Radeon HD 4850 1GB should be a bit (more or less 12%) better at anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 2600 (12%)

Pixel Rate

The Radeon HD 4850 1GB is quite a bit (more or less 79%) better at full screen anti-aliasing than the Radeon HD 4730, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 1GB		10000 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 4400 (79%)

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 maximum amount of data (counted in MB per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.