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Three different frequencies for 1333 speed RAM?


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#1 skymaster191

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Posted 10 November 2010 - 10:43 PM

I changed my mind and decided I want DDR3 1333 speed RAM for the motherboard linked below. But the Newegg site has 1333 memory broken down into three frequencies: PC3 10600, PC3 10660, and PC3 10666. Which one do I select for my motherboard?

Also will my motherboard accept the triple core processor shown on the other link?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131619

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103872

Edited by skymaster191, 10 November 2010 - 10:47 PM.


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#2 dc3

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Posted 11 November 2010 - 08:48 AM

See if this helps you to understand RAM.

RAM speeds can be quite confusing, as they can be expressed in several ways. Starting with the oldest DDR modules, the basic models run at an internal frequency of 100MHz, while more advanced modules increase the internal clock speed to 133MHz, 166MHz and up to 200MHz.

It might seem logical to refer to these different modules by their internal speeds but, thanks to the double data rate that gives DDR its name, a 100MHz module can carry out a theoretical maximum of 200 million transfers per second, while the 200MHz module can carry out 400 million transfers per second. For this reason, 100MHz DDR is known as DDR-200, 133MHz modules are labelled DDR-266 and so forth.

This is a fairly obvious system, but RAM transfers aren't very convenient units to work in. It's much more common to talk about data in terms of bytes. So to make DIMM speeds more easily understandable, they're also given a "PC-rating", which expresses their bandwidth in megabytes per second.

PC ratings can be calculated very simply. Each RAM transfer consists of a 64-bit word, or eight bytes. So to convert transfers-per-second into bytes-per-second, you simply multiply by eight. DDR-200 is thus equivalent to PC-1600.

DDR2 uses almost the same naming conventions, but the chips communicate with the CPU at twice the speed of DDR. The slowest DDR2 is therefore capable of 400 million transfers per second, and is designated DDR2-400, or PC2-3200. As you'd expect, DDR2 goes up to DDR2-800, also known as PC2-6400, and above this there's a high-end part, based on 266MHz chips, to give DDR2-1066. Its PC-rating is rounded down to PC2-8500 for convenience - its peak bandwidth is more like 8,533MB/sec.

DDR3 extends this process, running the I/O bus at four times the speeds of DDR - so the basic part can handle 800 million transfers per second, earning the labels DDR3-800 and PC3-6400, with faster chips being named accordingly.

The maximum standard RAM speeds approved by JEDEC - the body behind the three DDR standards - are DDR-400, DDR2-1066 and DDR3-1600. You may also hear of modules with higher speed ratings, such as DDR2-1250 and DDR3-2000, designed to run at overclocked speeds in enthusiast motherboards.

That ASUS motherboard will support the Athlon ll X3.

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#3 skymaster191

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Posted 11 November 2010 - 09:51 AM

Thanks for the detailed explanation.

In using this divide/multiply by 8 rule, then I assume that I want the PC3 10666? Or does it make any difference? Why do they even have three frequencies if they are alniost the same?

#4 dc3

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Posted 11 November 2010 - 10:19 AM

That motherboard will support PC3-8500, PC3-10600 and PC3-12800.

AS I understand it,the Front Side Bus is the link between the CPU and RAM. It will clock at the slowest speed of the two of these, so you want to match the RAM to the FSB. This is the reason for different frequencies of RAM.

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