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Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 01:11PM
I have a rev A 1.8 dual G5. I bought it with 1.5G of memory, 2x256 sticks from Apple, and 2x512 sticks from Smalldog when I bought the machine.

I just added two more 512 sticks from OWC. When they showed up and I installed them, they only showed up at 256 sticks, not 512s. They were marked correctly on the sticks, though. I called OWC and they exchanged them for me, no questions. I put in the new sticks, and they showed up as 512 each. I thought I was good to go. This was about a week ago.

Well, I just did an About This Mac, and the two new sticks are now showing up as only 256s, just like the first ones. When I installed them, they showed as 512. WTF, mate? There's been a few reboots since I installed them, but nothing else... Haven't cracked the case or even moved the machine.

Any ideas before I call tech support?





Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: jimbrady
Date: December 13, 2005 01:17PM
It wouldn't be the first OWC thing that's disappeard in a PM lately.



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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: lafinfil
Date: December 13, 2005 01:20PM
LOL jim

I don't know but it seems it might be a bug in your system since RAM has
started out OK twice and then went wonky.

You might try resetting the cuda switch while you're waiting for a real answer.



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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: Phy
Date: December 13, 2005 01:20PM
jimbrady Wrote:
-------------------------------------------------------
> It wouldn't be the first OWC thing that's
> disappeard in a PM lately.
>

Yup!
Funny, Jimbrady!
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 01:23PM
lafinfil Wrote:
-------------------------------------------------------
> I don't know but it seems it might be a bug in your system since RAM has
> started out OK twice and then went wonky.

The first set never showed up as 512. It always showed up as 256. I did a PRAM reset then to see if it would help, and it didn't. The second set showed up as 512 when I first installed it... then changed.





Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: Graphen
Date: December 13, 2005 01:36PM
Have you tried the two modules in different ram slots?

Run Rember from [www.versiontracker.com] maybe it might give some light on the situtation.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: Paul F.
Date: December 13, 2005 02:01PM
Hmm...

Reset CUDA...
Run your Hardware Test CD, and see what it says about the RAM.
Not a definitive test, but it might shed some light on things.






Paul F.
-----
A sword never kills anybody; it is a tool in the killer's hand. - Lucius Annaeus Seneca c. 5 BC - 65 AD
----
Good is the enemy of Excellent. Talent is not necessary for Excellence.
Persistence is necessary for Excellence. And Persistence is a Decision.

--

--

--
Eureka, CA
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: hwystar
Date: December 13, 2005 02:12PM
It also might be worth a try pulling all the sticks except a pair at a time, and test the new pair by themselves and see what they show as, and also try testing the older pair by themselves (the ones that only showed up as 256 MB ea.).

If it is not an issue with the type of RAM, or a HW problem with the machine, then maybe it is something related to mismatch between RAM latency (CL) speeds possibly? Just stabbing in the dark here. But I am making the assumption that the type of RAM is correct for the machine, because I know that some machines only work with RAM modules of a certain density, or with chips on a certain side of the module, etc.

Whenever possible, I would advise trying to match up all the modules and have them at least be exactly the same spec, in particular the latency spec, if not the same exact brand, part number, and spec. I have heard that mismatched RAM modules can lead to problems with kernel panics, etc. on G5s.

I just put a matched set of four new modules in my G5 and yanked the old pair of smaller modules for that reason. Wanna buy a pair of 512 MB modules? winking smiley


HTH
hwystar
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: OWC Larry
Date: December 13, 2005 03:33PM
What does Apple Profiler say about the other memory? All of it should show up as 30330 in the profiler - we have seen issues where stuff with a different PC3200 program wonks things up. All of our memory is 30330, btw...

Also - I'd swap slots. We sell a ton of memory, it's all pretested, and top quality stuff as does no good for anyone if we've got to do an exchange. That said - I'd suspect a problem with the G5 after a 2nd set doing the same thing... and we have not had this sort of thing being reported.

Weirdness no matter what. But we'll get it sorted out.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: OWC Larry
Date: December 13, 2005 04:21PM
Actually this covers it quite well...

Apple's spec is for CAS 3.0 with a 30330 program that you can see in the ASP.

In testing - when mixing different CAS rated modules (even where Pairs were the same rating and matched) - systems had issues... which is why we ship straight to Apple standard... Faster is possible, but to be stable - all modules installed would have to be of that rating meaning you'd have to pull out what you had stock, etc.

hwystar Wrote:
-------------------------------------------------------
> It also might be worth a try pulling all the
> sticks except a pair at a time, and test the new
> pair by themselves and see what they show as, and
> also try testing the older pair by themselves (the
> ones that only showed up as 256 MB ea.).
>
> If it is not an issue with the type of RAM, or a
> HW problem with the machine, then maybe it is
> something related to mismatch between RAM latency
> (CL) speeds possibly? Just stabbing in the dark
> here. But I am making the assumption that the type
> of RAM is correct for the machine, because I know
> that some machines only work with RAM modules of a
> certain density, or with chips on a certain side
> of the module, etc.
>
> Whenever possible, I would advise trying to match
> up all the modules and have them at least be
> exactly the same spec, in particular the latency
> spec, if not the same exact brand, part number,
> and spec. I have heard that mismatched RAM modules
> can lead to problems with kernel panics, etc. on
> G5s.
>
> I just put a matched set of four new modules in my
> G5 and yanked the old pair of smaller modules for
> that reason. Wanna buy a pair of 512 MB modules?
> winking smiley
>
>
> HTH
> hwystar


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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 04:32PM
OWC Larry Wrote:
-------------------------------------------------------
> What does Apple Profiler say about the other memory? All of it should show up as 30330 in the
> profiler - we have seen issues where stuff with a different PC3200 program wonks things up. All of
> our memory is 30330, btw...
>
> Also - I'd swap slots. We sell a ton of memory, it's all pretested, and top quality stuff as does
> no good for anyone if we've got to do an exchange. That said - I'd suspect a problem with the G5
> after a 2nd set doing the same thing... and we have not had this sort of thing being reported.
>
> Weirdness no matter what. But we'll get it sorted out.

The original Apple 256 sticks say:
DIMM0/J11:
Size: 256 MB
Type: DDR SDRAM
Speed: PC3200U-30330

The other 512 sticks from Smalldog that have worked well since day one say:
DIMM2/J13:
Size: 512 MB
Type: DDR SDRAM
Speed: PC3200U-25330

The OWC 512 sticks say:
DIMM4/J41:
Size: 256 MB
Type: DDR SDRAM
Speed: PC3200U-30330

...but said 512 when I first put them in.






Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: hwystar
Date: December 13, 2005 04:42PM
sscutchen Wrote:
-------------------------------------------------------

> The other 512 sticks from Smalldog that have
> worked well since day one say:
> DIMM2/J13:
> Size: 512 MB
> Type: DDR SDRAM
> Speed: PC3200U-25330


I would be curious what the ASP would say if you pulled this pair and checked the others again.


hwystar
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 05:56PM
OK, more data:

I first tried swapping positions with the OWC and Smalldog sticks so that the 30330 memory would be in the first two slots and the 25330 memory in the last slot. The OWC 512s still read as 256.

Then, I completely removed the Smalldog 512 sticks. The OWC sticks STILL read as 256.

DIMM0/J11:

Size: 256 MB These are original Apple RAM
Type: DDR SDRAM
Speed: PC3200U-30330

DIMM1/J12:

Size: 256 MB
Type: DDR SDRAM
Speed: PC3200U-30330

DIMM2/J13:

Size: 256 MB These are the OWC 512 sticks.
Type: DDR SDRAM
Speed: PC3200U-30330

DIMM3/J14:

Size: 256 MB
Type: DDR SDRAM
Speed: PC3200U-30330

DIMM4/J41:

Size: Empty
Type: Empty
Speed: Empty

DIMM5/J42:

Size: Empty
Type: Empty
Speed: Empty






Don't ask who the bell's for, dude. It's you.



Edited 1 time(s). Last edit at 12/13/2005 05:57PM by sscutchen.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 06:19PM
I just ran a Rember memory test on the current config (Apple 256s, OWC 512, showing as 256s) and everything passed.





Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 06:27PM
OK, this time I have ONLY the OWC ran installed. They STILL show up as 256 each.

I'm out of swaps to try...





Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: OWC Larry
Date: December 13, 2005 07:16PM
Send a request in for a cross ship....

While it wouldn't make sense for the 256MB problem.. will warn anyway that we found problems we could repeat under load when different CAS programmed pairs were in the same G5.. note - our testing was done with a G5 Dual 2.5GHz (not dual core quad that takes DDR2...)...

Anyway - fire your request in here:
[eshop.macsales.com]

Request the cross ship - they will get you set up. Feel free to PM or e-mail me as well.

Sorry for the hassle... but - what's happening is very odd since two different sets now. That just doesn't happen. Shouldn't even happen once... if does a third time, that G5 is making toast.



OWC Larry
Other World Computing
[www.macsales.com]
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 13, 2005 07:36PM
Here's what I wrote in the cross ship request:

=-=-=-=-=
I have a rev A 1.8 dual G5. I bought it with 1.5G of memory, 2x256 sticks from Apple, and 2x512 sticks from Smalldog when I bought the machine over a year ago. (the Smalldog memory shows as PC3200U-25330 rather than PC3200U-30330)

I just added two more 512 sticks from OWC. When they showed up and I installed them, they only showed up at 256 sticks, not 512s. They were marked correctly on the sticks, though. I called OWC and y'all exchanged them for me, no questions. I put in the new sticks, and they showed up as 512 each. I thought I was good to go. This was about a week ago.

Well, I just did an About This Mac, and the two new sticks are now showing up as only 256s, just like the first ones. When I installed them, they showed as 512.

I've done the following:

Rearranged the slot order of the memory.
Removed the Smalldog PC3200U-25330 512 sticks.
Removed all but the OWC memory.

In all cases the OWC memory shows up as 2x256 sticks. I've run the hardware memory test and all tests passed.

Larry on OWC's Macresource forum, told me to come here and ask for the cross ship.

I no longer have the shipping packaging, so I'd like to wait until I get the new sticks and then use that packaging to return these.
=-=-=-=-=

I appreciate y'all working with me on this. I just don't understand how it could be a G5 problem if the other sticks are working fine and these are not, regardless of order or slot, even by themselves... When you say "making toast" what does that mean?





Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: Paul F.
Date: December 13, 2005 10:12PM
<When you say "making toast" what does that mean?

I think it means, stick a fork in those RAM slots.. they're done...

(but seriously, I think it means that you have a hardware problem that may not be cost effective to fix...)






Paul F.
-----
A sword never kills anybody; it is a tool in the killer's hand. - Lucius Annaeus Seneca c. 5 BC - 65 AD
----
Good is the enemy of Excellent. Talent is not necessary for Excellence.
Persistence is necessary for Excellence. And Persistence is a Decision.

--

--

--
Eureka, CA
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: sscutchen
Date: December 16, 2005 06:57PM
OK... Hopefully Larry has this thread marked 'cause otherwise no one will ever get down this far.

I got the cross-shipped memory today, installed it and it shows 2x512 sticks, just like it is supposed to. Yea!

I'm going to give it a week before I declare victory. But I will go ahead and return the memory I had which goes back as part of the cross ship.





Don't ask who the bell's for, dude. It's you.
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Re: Weird Disappearing OWC Memory Thing in my PM
Posted by: OWC Larry
Date: December 16, 2005 08:15PM
Let me know if the same thing happens again... then you've got a G5 with a special talent.



OWC Larry
Other World Computing
[www.macsales.com]
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