Radeon HD 4730 vs Radeon HD 4750

Intro

Compare those specifications to the Radeon HD 4750, which has clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 4730		140 Watts
	Difference: 65 Watts (87%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4730 will be 13% quicker than the Radeon HD 4750 overall, due to its higher bandwidth. (explain)

Radeon HD 4730		57600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The Radeon HD 4750 should be just a bit (more or less 4%) faster with regards to anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 960 (4%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4750 is a better choice, by far. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 6080 (109%)

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 max amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 can be processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.