1. I've seen DIMMs with parity on the back side. That's a possibility. I recall encountering Registered DRAM (which these might be) where the parity function was somehow integrated into the latch register chip.
2. Most of the non-eBay images I've found are *definitely not* of that part # and are therefore worthless as data points.
3. That is *not* a HyperX part# despite what's in the Kingston URL.
4. It's system-specific RAM: you know as well as I do that's often the regular stuff, just better tested. But not always.

In short... If you have an HP XW (Kayak) series workstation, go ahead and use these. If you have an HP server, tread carefully: trust but verify. For any other use, I'd probably stay away.

-Adam

On December 1, 2015 6:26:06 PM CST, Hartmut W Sager <hwsager@marityme.net> wrote:
Off the top, I'd say don't touch it!  It could be a revival of those fraudulent "phantom parity" stick that were marketed long ago, though I can't imagine Kingston or HP engaging in that fraud.
 
There is, however, one way these could be ECC after all.  If the 4 chips on one end are the main data chips, and the other 4 chips at the other end are of much lower capacity and carry the parity bits.  Unfortunately, on the eBay pic, a sticker is covering all 4 chips at one end, so you can't compare.
 
Oh, there is one other (not uncommon) possibility - some lower capacity chips on the back of the DIMM to carry the parity bits.  Do we have a pic of the back anywhere?
 
Hartmut W Sager - Tel +1-204-339-8331


On 1 December 2015 at 17:52, Trevor Cordes <trevor@tecnopolis.ca> wrote:
I'm doing some ECC RAM shopping on ebay (as per prev postings).

I came across something weird.  There's a stick showing up in various
places that claims to be ECC but all pics (and the physical unit, I've
confirmed) have only 8 (or 16) DRAM chips, not 9 or 18.

Does this make any sense to anybody?  Is this possible??

The stick is Kingston KTH-XW4400E6/2G

http://www.walmart.com/ip/Kingston-KTH-XW4400E6-2G-2GB-ECC-DDR2-800-240-pin-SDRAM-HP-Server-Memory-Module/13214501
http://www.ebay.ca/itm/221949985186?

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820134842
specifically says in "overview" it has "Error Checking and Correcting
Technology"

Kingston has discontinued this part and it's hard to even find on the site
anymore, but here's:

http://www.ec.kingston.com/ecom/hyperx_us/partsinfo.asp?root=&ktcpartno=KTH-XW4400E6/2G
says x72 ECC
The equiv HP #'s they provide all show up on the net as 9 chip, so this
Kingston stick should be ecc.

??? WTF?
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