Putting it all in RAM (was: comparing CPU's)

[ted leslie]

2 x 2GB on one cpu

2 x 2 GB on the other, and 2 x 512MB

oddly enough my current tyan (not the 16 slot one),
has 4 slots for one cpu and 2 slots for the other, for a total of 6,
a bit odd, but its not really a high end server board, more good
workstation board.

-tl


On Mon, 2006-08-28 at 14:36 -0400, Lennart Sorensen wrote:
> On Mon, Aug 28, 2006 at 12:35:23PM -0400, ted leslie wrote:
> > the problem with puttin lotsa ram in a mobo, is that they have power
> > draw issues, and will only allow max. population if modules are NOT
> > stacked and are single rank.
> > Most moduiles are stacked (double the chips, more power draw but cheaper
> > to make),
> > so the MOBO (in case of tyan), will down grade the clock to 333Mhz
> > if you exceed the rank value.
> > The tyan that has 16 slots, can be populated to a max. of 24GB and
> > retain the 400Mhz DDR speed. if you want 32 GB then its down to 333Mhz.
> > I am not going to exceed 9GB until i experiment and see the benefits,
> > then buy more ram as required.
> 
> 9GB seems like an odd amount.  How are you distributing that?  As far as
> I know, the opteron systems give best performance when each cpu has the
> same amount of ram and the same amount of ram on each of the two
> channels per cpu, so in you case I would think 2GB per channel per cpu
> would make sense, unless you happen to have some 256MB sticks you are
> trying to use too giving 2.25GB per channel per cpu.
> 
> --
> Len Sorensen
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