Radeon HD 3850 512MB vs Radeon HD 4750

Intro

Compare those specifications to the Radeon HD 4750, which comes with GPU core speed of 730 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 128-bit bus. It also features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

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 512MB is 4% quicker than the Radeon HD 4750 in general, because of its greater data rate. (explain)

Radeon HD 3850 512MB		52992 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 1792 (4%)

Texel Rate

The Radeon HD 4750 should be much (approximately 119%) better at anisotropic filtering than the Radeon HD 3850 512MB. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 3850 512MB		10688 Mtexels/sec
	Difference: 12672 (119%)

Pixel Rate

The Radeon HD 4750 will be a small bit (approximately 9%) faster with regards to anti-aliasing than the Radeon HD 3850 512MB, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 3850 512MB		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: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 can be applied in one second. This number is calculated by multiplying the total number 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.