Justin Piszcz wrote:
> Does the TYAN S3992G3NR-RS support non-ECC memory?
>
> If so, will the following memory work with this motherboard?
>
> http://www.newegg.com/Product/Produc...82E16820134046
>
No. Crucial and Kingston have search engines, and you can see the correct
types for yourself. Generally, if you are getting registered memory,
it comes with ECC, as registered memory usage implies large quantities
of memory, as in a server. You may be able to disable ECC, if you want to
test the performance impact of with/without ECC. But vendors don't have
much incentive, to offer registered non-ECC memories.
http://www.crucial.com/store/listpar...under%20h2000M
http://www.ec.kingston.com/ecom/conf...sp?SysID=32155
For info on the ECC operating modes, try this doc. Page 148 describes
"normal" ECC and the second mode is "chipkill". Chipkill is useful if there
are x4 width memory chips on the module - a single x4 chip can be completely
dead, and the memory will still work. Chipkill has a dual channel orientation
to it, since the protection scheme works with a 144 bit wide array, and that
takes two 72 bit wide modules to give the needed width:
http://www.amd.com/us-en/assets/cont...docs/32559.pdf
The Tyan user manual may have more info. The AMD docs are a bit threadbare,
in terms of being really useful. Either too little detail, or microscopic detail.
AMD 32559 is the microscopic kind.
http://www.tyan.com/product_board_detail.aspx?pid=235
Registered memory does impact the memory, in the sense that the register
chip may have a different upper bound on clockrate, than the memory chips
themselves. That is why you might find DDR2 unbuffered memory running at up
to DDR2-1066 in some cases (usually overvolted to do it), while the registered
stuff is offered at DDR2-667. Since the registered stuff will always be operated
at a conservative operating point, it should hold up better in the long run.
Paul
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