Radeon HD 3850 X2 vs Radeon HD 4750

Intro

Compare that to the Radeon HD 4750, which makes use of a 40 nm design. AMD has clocked the core frequency at 730 MHz. The GDDR5 RAM runs at a speed of 800 MHz on this card. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 X2 should be much faster than the Radeon HD 4750 overall. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 54784 (107%)

Texel Rate

The Radeon HD 4750 is just a bit (approximately 9%) better at texture filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 1984 (9%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 3850 X2 is the winner, by a large margin. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 9696 (83%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling 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 record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number 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 drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.