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Motherboard DDR3-XXXX explanation

Last response: in Motherboards
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January 25, 2014 3:53:28 PM

When looking at motherboards, it always says something like "Dual DDR3-1866" or "Dual DDR3-1600" and then I buy the matching rams but then the specifications would say "Bus Clock

2400 MHz, 2200 MHz, 2000 MHz, 1800 MHz, 1600 MHz, 1333 MHz, 1866 MHz, 2133 MHz, 2800 MHz, 3000 MHz, 2600 MHz, 2666 MHz, 2500 MHz, 2933 MHz "

Am I mixing something up?
a b V Motherboard
a b } Memory
January 25, 2014 4:10:05 PM

Both Intel and AMD have included the memory controller in the processor for some years now.
This means the default memory speed to be used is based on the CPU.
The motherboard should support a wider variety of speeds.
Faster memory will operate the slower speed supported by the CPU unless over clocking.

They also confuse things in the way these products are advertised.
Take DDR3-1600 for instance. This can also be called PC3-12800. It actually has a data rate of 1600MT/s, peak transfer rate of 12800MB/s and an I/O bus clock of 800MHz. It essentially uses the up and down of the signal (hence DDR or double data rate) and this is how they come up with "1600MHz" but this isn't really the clock rate.
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January 25, 2014 5:18:53 PM

VincentP said:
Both Intel and AMD have included the memory controller in the processor for some years now.
This means the default memory speed to be used is based on the CPU.
The motherboard should support a wider variety of speeds.
Faster memory will operate the slower speed supported by the CPU unless over clocking.

They also confuse things in the way these products are advertised.
Take DDR3-1600 for instance. This can also be called PC3-12800. It actually has a data rate of 1600MT/s, peak transfer rate of 12800MB/s and an I/O bus clock of 800MHz. It essentially uses the up and down of the signal (hence DDR or double data rate) and this is how they come up with "1600MHz" but this isn't really the clock rate.


Thanks....How do I know what ram speed the CPU supports?...I expect to get a 4770K CPU in my new build in april/may, so what ram should I pick

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a b V Motherboard
a b } Memory
January 25, 2014 5:37:37 PM

DDR3-1333 or DDR3-1600 supported.
2 memory channels, so a kit with 2 sticks e.g. 2x8GB.
http://ark.intel.com/products/75123
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January 25, 2014 6:34:39 PM

VincentP said:
DDR3-1333 or DDR3-1600 supported.
2 memory channels, so a kit with 2 sticks e.g. 2x8GB.
http://ark.intel.com/products/75123


Thanks....I was going to get a 1866 because that was what the motherboard supported but to hell with that then.

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a b V Motherboard
a b } Memory
January 25, 2014 7:08:02 PM

Casper Larsen said:
VincentP said:
DDR3-1333 or DDR3-1600 supported.
2 memory channels, so a kit with 2 sticks e.g. 2x8GB.
http://ark.intel.com/products/75123


Thanks....I was going to get a 1866 because that was what the motherboard supported but to hell with that then.


DDR3-1866 will work, but run at DDR3-1600 speed so there is no advantage in it.
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