DDR3-1333 vs. DDR3-16000

[aaron d]

On my AMD system, at least, memory and CPU are set by FSB and multipliers.
RAM has a separate multiplier than the CPU, so I am able to run it at it's
stock speed(ddr3-1600). I can also tighten the timings to those stated in
the literature for my RAM. All this doesnt effect the CPU speed at all. One
thing to note is that it is very hard to find DDR3 that aruns at the SPEC
voltage (1.5). While most baords will support giving more juice, you have to
pay attention. IF you know what kind of RAM voltage settings your current
board has, that is good.




On Sat, Feb 5, 2011 at 1:20 AM, William Park <opengeometry-FFYn/CNdgSA at public.gmane.org> wrote:

> On Sat, Feb 05, 2011 at 01:03:24AM -0500, Scott Sullivan wrote:
> > On 02/04/2011 11:53 PM, William Park wrote:
> > >Hi all,
> > >
> > >I have basic overclocking question...
> > >
> > >Most CPU specs say DDR3-1333 (i7 upto DDR3-1066), and most motherboard
> > >specs say DDR3-1600 or higher.  What's the point of using DDR3-1600
> > >memory when the CPU (memory controller inside) can only do DDR3-1333 ?
> > >
> > >Common answer seems to be for better overclocking.  But, specs for both
> > >2.8GHz and 3.2GHz CPUs say DDR3-1333.  So, I don't get it.
> > DDR3-1333 is the default maximum "safe" speed by spec for DDR3 Memory.
> > Anything over that is outside of spec, but there is sufficient demand
> > for over clocking that Memory is now built to handle those higher
> > speeds. It is up to the owner of the system to change the BIOS settings
> > to enable those higher speeds. It is up to the person doing the
> > overclocking to verify compatibility choose the appropriate voltages and
> > timings.
> >
> > It's very similar to running your CPU at a higher frequency, it just not
> > considered "safe default" to do so unless you know what your doing.
> >
> > I've done this once before when I built a machine for a friend.
>
> Does that mean CPU frequency and Memory frequency move proportionally,
> say by 10% each?
>
> --
> William
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