what platform uses ECC-R DDR1s ?

[Quinn]

I've just found out that sever-grade 2GB 333MHz ECC-R DDR1 modules could be bought at prices below 100$, what is level of new 512MBs. So I'm wondering what system could actually use them - and if it's price won't obliterate benefits from 4 times more ram.

From what I've know so far, ECC is error-check, some extra bytes to verify if the normal ones are straight. Most home mobos will support ECC mem. Usually server mobos require ECC, and desktops can work with both.
Registered or buffered is another deal, a small chip that manages signals on the stick to reduce stress on memory controller (what allows servers to handle zilions of banks of dimms) at cost of some latency (what is bad for Quake). When it comes to buffering mobos are very particular about that, either accepting only buffered in servers or only unbuffered in desktops.
Correct me if I'm wrong with above.

So what could support those monster sticks at killer price?

AMD:
Socket 940 Opterons (the first 940, not AM2) will probably do, but as truly server stuff they're not quite ok for home pc.
AM2 has DDR2 ctrler integrated into processor so kinda no way.
Socket 939 and 748, hard to find any info. Could they handle buffered mem?
Older socket A, with 4GB limit coming from 32bit addressing they're hardly a choice for today, but their mem controller is on chip, so maybe some northbridge vendor went crazy enough to support ECC-R.
Funny thing is one guy reports his via KT600 mobo as being able to see one of mentioned sticks, but only as 1GB. I doubt would this mem work in this config any futher then BIOS report screen, coz VIA officially denies registered support.

What about Intels ? Most desktops use DDR2, so out of question, but afaik their mem ctrler isn't hardmounted in the processor, so maybe is there a chance.

So if you skipped all above, the question is: "What platform can support ECC-R DDR1 memory?".

[hinch]

duel processor boxes use registered ecc ram.

basically theres extra check bits in the ram so that data split between different processors and different banks still ends up correct when its called for

xeon's pIII duel proc boxes and the like. 333mhz ddr1 is like 3ghz and below procs

[Quinn]

Reading manuals from TYAN boards was most insightfull.
1) 939 and AM2 won't support buffered ram at all.
2) 940 opterons will.
2) Some Socket A will, ie dual-proc AMD760-based. More interesting it CAN run unbuffered and non-ECC in first 2 of its 4 slots. 1GB max acceptable DIMM size, however. Also surprisingly there are VIA KT400 boards supporting registered mem, but not ECC... More funny, VIA claims to have ECC support on all KT chipsets, but says nothing about registered.

So I am begining to wonder if buffering is really so much different, and won't it be possible to run buffered mem in normal mobo, maybe a matter of setting higher CLs and other delay signals.