Mac Pro Ram ECC Errors - help

swo

macrumors newbie
Original poster
Aug 19, 2006
6
0
I just got a new Mac Pro.
I received 2 512's of Ram From Apple.
I bought 4 of the 1gig Ram from OWC (says its to Apple specs).

I have the 4 1gigs in the top 4 slots,
and the 2 512's on the Bottom.

I have had my machine on for the last 24 hours or so since i got it -
I am getting a LOT of ECC errors on the A1 riser 1gig Ram
and a few and the B1 riser - 512.

Should I be worried about this,
and is there any other way to test my RAM to make sure it is okay.

The A1 riser worries me with : 365288143 errors

Here is the Report from the Apple Profiler:
DIMM Riser A/DIMM 1:

Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: ECC Errors
ECC Correctable Errors: 365288143

DIMM Riser A/DIMM 2:

Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK

DIMM Riser A/DIMM 3:

Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK

DIMM Riser A/DIMM 4:

Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK

DIMM Riser B/DIMM 1:

Size: 512 MB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: ECC Errors
ECC Correctable Errors: 110

DIMM Riser B/DIMM 2:

Size: 512 MB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK
 

Sun Baked

macrumors G5
May 19, 2002
14,874
57
Besides mixing things up...

To get the benefit of the 4 channel memory, the 4 GB needs to be spit to 2 risers in the first DIMM spots on each Riser A&B, with the last 1 GB filling up Riser A.

While you are switching things around, you can always move the erroring memory to the other riser.

---

You have 4 available channels in 2 branches -- channel 0/1 on Riser A and channel 2/3 on Riser B. So to get all channels on at the same time, same memory 2 risers same DIMM slots.

 

swo

macrumors newbie
Original poster
Aug 19, 2006
6
0
helpful advice

thanx so much - !
I really appreciate you taking the time to help out.
I'll move the Ram to its proper places now.

Is there a chance that the one stick getting all the errors is defective?
 

Silentwave

macrumors 68000
May 26, 2006
1,584
0
Gainesville, FL

swo

macrumors newbie
Original poster
Aug 19, 2006
6
0
cheaper not always better

sun baked ...
thank you kindly for the advice. I am about to try switching the ram around now. I will watch to see if that also makes a difference with the Errors.
If the errors do keep up on that one stick of RAM -
I will be sending it back.

Chatin, Silent Wave:
I like OWC and use them for most of my mac hardware -
i try to keep supporting a company that has always been of good service to me.
Price is not the most important aspect in why i choose a product, I've learned in the past that the cheapest option is often cheapest for a reason.
It would be a little irrational to spend the money on a top of the line machine like the Mac Pro, and then purchase substandard Ram for it. (NewEgg's might be as good, but that hasn't been proved yet - and OWC's claimed to be to Apple's specs and were available right away).
That being said I could have purchased a defective and expensive stick of Ram - in that case I will be requesting a replacement!

Thanx to all of you for the advice.