Re: Asus A7V8X RAM :[

In article <1126808101.589656.250410@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
"Menas" <KouRaGe@xxxxxxxxx> wrote:

> Your summary is correct, except the Elixir came with the computer when
> I first built it.
> You are definitely right about the collection at best buy, they're
> terrible when it comes to this. I did try the elixir by itself (i have
> had that ram for over 2 years now) and I ran memtest on it alone with
> no other RAM in the motherboard and it was error free.
>
> As for the BIOS, I just flashed it last night, and tried the RAM again,
> and the system just shuts down seconds after it logs into windows.
> Then i tried it one more time and ran cpu-z, and everything between the
> two sticks matched then the system shut down lol.
>
> I also tried every configuration from 1st slot to 3rd slot. I did push
> the voltage up, as high as i can go and then as low as i can go and
> then left it on auto and it still gave me errors.
>
> There was one more thing i realized when reading my manual about
> installing ram. It had this kind of chart but my question about the
> chart is, what or why are they calling each slot, Rows 0&1, 2&3, 4&5.
>
>
> DDR DIMM1 DDR DIMM2 DDR DIMM3
> (Rows 0&1) (Rows 2&3) (Rows 4&5)
> SS/DS SS/DS SS/DS
> SS/DS SS/DS SS/DS
>
> But I did just return the RAM today, and now i want to buy another one
> (also im a little scared to buy one considering what happened twice
> already hehe)
> so hopefully next time I will make the right choice.
>
> Also I talked to someone in my comp sci class, he told me that Micron
> and Crucial (or was it Corsair) are actually the better RAM to buy, b/c
> the other companies take the rejected RAM from micron and crucial. Is
> this true?
>
> Thank you so much Paul for ur help and the list of vendors to purchase
> from, I did not think about that at all.

"Rows" refers to the two banks max of RAM that can be on a DIMM.
The JEDEC pinout for the DIMM, puts enough control signals to control
two 64 bit wide banks of memory. A double sided memory (DS) has two
separate banks of memory on it. The table above is basically
communicating, that there are no limits in terms of banks.

The reason for me mentioning "rejects", is you have to consider
for a moment, why a company gets into the "Value RAM" business.
In some cases, the Value RAM business is a "flow-thru" thing -
you buy third party RAM and stamp your name on it, making a buck
in the process. In other cases, Value RAM might consist of any
modules that did not make the cut as overclocker RAM. When smaller
companies offer Value RAM, they haven't a chance to compete on
price, with the big boys, so you have to ask yourself whether
they are just disposing of the RAM that didn't offer a high
overclock.

In all cases, a memory should meet its SPD speed rating, no
matter where it came off the production line. Customers have
noticed certain brands/models of RAM, that would not overclock
more than a few MHz - that is a symptom of carefully binned memory,
and if the overclock is that poor, it suggests there will be a
few customers who won't be able to run such a product error free
even at stock speed.

All I can suggest, is using Google or the search engines on the
private forums, to get some idea as to what the characteristics
of a certain brand/model of RAM might be. This is a laborious
research process, and whether it is worthwhile, really depends
on how easy it is to buy RAM where you live.

As for what channels the memory chips are taking, I don't have
any insider info on what scams are being pulled. Micron is a
semiconductor manufacturer. They also make modules, and they
should be knowledgeable on how to make them properly. Crucial
takes the Micron modules, and simply adds their sticker to the
module. There is no crossref table available, to map Micron module
part number to Crucial part number, but there are ways of
figuring it out (using pictures on Newegg).

Micron bins their DDR, and selects some of the better chips for
their Ballistix line. That would be in direct competition with
other companies wishing to use that same RAM to make CAS2
modules and the like. I don't know if Micron sells to these
small companies, just the unbinned chips (meaning they have to
sell both the good and the not-so-good chips), or supplies them
with binned chips.

The other class of chips, are the ones that fail all bins at
the factory. The memory chip maker may find some chips good
for making PC4000 memory, some others that just make PC3200,
and perhaps a small percentage that throw errors. No part
numbers are printed on these, and they may be sold to other
companies, to be sorted and used. You may notice that
"generic" memory modules, sometimes have no printing on the
chips, or some company name we have never heard of, is
printed on the tops of the chips. These are the kinds of
modules that you have to ask questions about - without
proper labelling on the top of the chip, there is no way
to know whether the chip was properly tested and binned
at the factory, or the chip is just one from the "scrap
pile". Personally, I think the selling of memory chip
"blanks" is a disreputable practice - if a memory is good
enough to sell, it is good enough to be labelled.

"A7V8X memory settings"
http://www.lostcircuits.com/discus/messages/5/1401.html?1098747072

"A7V8X Build Thread" -- this is a huge rambling thread
http://forums.pcper.com/showthread.php?t=157451&highlight=a7v8x+build+thread

Since some of my favorite search engines are failing
right now, no more searches for me at the moment.

Here is a setting I noticed in the manual just now:

"SDRAM 1T Command Control" [disabled] <--- more setup time
for memory address
if disabled.

HTH,
Paul
.

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