Radeon HD 3850 1GB vs Radeon HD 4750

Intro

Compare all of that to the Radeon HD 4750, which features GPU clock speed of 730 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 128-bit bus. It also features 640(128x5) Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the Radeon HD 3850 1GB should be a bit faster than the Radeon HD 4750 overall. (explain)

Radeon HD 3850 1GB		52992 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 1792 (4%)

Texel Rate

The Radeon HD 4750 should be quite a bit (approximately 119%) faster with regards to texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 3850 1GB		10688 Mtexels/sec
	Difference: 12672 (119%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4750 is a better choice, but only just. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 3850 1GB		10688 Mpixels/sec
	Difference: 992 (9%)

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 (in units of megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card 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 colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.