Thanks , this is the system I'm thinking of putting together



TYAN S2696A2NRF (SATA) Dual Socket 771 Intel 5000X Extended ATX Server
Motherboard - Retail
Item #: N82E16813151048


SAMSUNG SpinPoint T Series HD501LJ 500GB 7200 RPM SATA 3.0Gb/s Hard Drive -
OEM

OCZ GameXStream OCZ700GXSSLI ATX12V 700W Power Supply - Retail
Item #: N82E16817341002


CHENBRO SR10769-BK Black 1.0 mm SECC Server Case - Retail

Crucial 2GB 240-Pin DDR2 FB-DIMM DDR2 667 (PC2 5300) ECC Fully Buffered
Server Memory Model CT25672AF667 - Retail




"Paul" <nospam@needed.com> wrote in message news:evm5i3$3ah$1@aioe.org...
> kony wrote:
>> On Thu, 12 Apr 2007 10:43:30 GMT, "Hank" <Hank@Hank.net>
>> wrote:
>>
>>> this is a motherboard memory specifications, do I read that as
>>>
>>> up to 32 gig of ddr2 memory running at 533
>>>
>>> or
>>>
>>> up to 16 gig of ddr2 memory running at 667?
>>>
>>>
>>> why would it have this limitation? I would think it wouldn't matter (to
>>> the motherboard) what the speed was
>>>
>>> thanks
>>>
>>
>>
>> The same is true of all motherboards whether spec'd or not.
>> The more memory you install the lower the stability margin,
>> and if the margin drops low enough it will require reducing
>> the memory bus speed or raising the timings to retain
>> stability (and/or registered or buffered memory). However,
>> some boards conveniently avoid this by merely having too few
>> slots to install that much, or their bios logic
>> automatically changes the timings to compensate.
>
> The OP may be referring to a 5000 series server motherboard, with
> FBDIMM memory. FBDIMMs are serially connected, at extremely
> high speed. They are effectively point to point. The second
> FBDIMM in a channel is daisy chained to the first, meaning
> there is the "thru-delay" via the AMB on the first module,
> before you get to the second.
>
> The serial interconnect on the FBDIMM, is synchronous to what
> the memory chips are doing. If DDR2-667 memory is used,
> the serial interconnect is at 12 x 333MHz, for a 4Gbit/sec
> interconnect to controller or to the next FBDIMM.
>
> http://en.wikipedia.org/wiki/FBDIMM
>
> I cannot figure out a reason why one of those would have
> a stated capacity versus speed issue. Being fully buffered,
> the motherboard cannot "see" the load from the memory chips
> on the module. So it shouldn't matter. The Tyan advertising
> seems to relate size to speed, but the Supermicro advertising
> for similar products doesn't.
>
> Tempest i5000XT (S2696)
> http://www.tyan.com/product_board_spec.aspx?pid=43
>
> "Maximum of 32/16GB of DDR2-533/667"
>
> So it is still a mystery to me, why they state it that way.
> And the user manual does not elaborate further on the issue.
>
> Paul
>
>
>