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Mac Pro octo 08 16GB ram splitting hairs question

S

Shelob

macrumors newbie
Original poster
Feb 15, 2008
6
0
With out going into it I have 8GB (4x2) matched (for real, all 4 have the same part #) and 2 sets of 4GB (2x2) matched.

Based on what I've read I put the 8GB matched in riser 1 slot 1 & 2 and riser 2 slot 1 & 2 and 1 4GB matched in slot 3 & 4 on each riser. Does this seem right or should I have the 8GB on the same riser. Or does it make no real difference.
 
Shelob said:
With out going into it I have 8GB (4x2) matched (for real, all 4 have the same part #) and 2 sets of 4GB (2x2) matched.
Based on what I've read I put the 8GB matched in riser 1 slot 1 & 2 and riser 2 slot 1 & 2 and 1 4GB matched in slot 3 & 4 on each riser. Does this seem right or should I have the 8GB on the same riser. Or does it make no real difference.
Click to expand...

Huh? Isn't 8GB (4 x 2) exactly the same as 2 sets of 4GB, which would be
2 X (2 X 2)? It sounds like you have 8 sticks of 2GB RAM for a total of 16GB. If that's so then your question makes no sense. If you have 2 sets of 4GB, then you have (2 X 4), not 2 X 2 like you stated. In that case put the 2 X 4 in Riser A, slots 1 and 2.
 
Shelob said:
With out going into it I have 8GB (4x2) matched (for real, all 4 have the same part #) and 2 sets of 4GB (2x2) matched.

Based on what I've read I put the 8GB matched in riser 1 slot 1 & 2 and riser 2 slot 1 & 2 and 1 4GB matched in slot 3 & 4 on each riser. Does this seem right or should I have the 8GB on the same riser. Or does it make no real difference.
Click to expand...
It's truly amazing how many hundreds of posts have been written about memory configuration in the 2008 MPs. Never before have so many been so confused about so little.
 
tugger said:
It's truly amazing how many hundreds of posts have been written about memory configuration in the 2008 MPs. Never before have so many been so confused about so little.
Click to expand...

That's because newbies almost never searched the board before they start a thread. Hence the numerous repeated threads on the same questions.
 
I have been around the block a few times and I've read most of the posts and didn't come across this question.

Yes I have 8 2GB sticks and bought them on three ocassions. I bought 4GB (2 x 2GB) twice and each of those pairs is matched to themselves. I then bought 8GB (4 x 2G) and all 4 of those are matched to each other, all 4 have the same part number.

My question is not about the size, they're all the same size, I read enough to know the order of mismatched sizes. Barefeats says 8 sticks of the same size works the best and I really didn't have the cash to max it out at 32GB. I'm asking about the placement of the matched pairs. Here's what I have (I'm just making up the part number for this example):

2GB prt# 1
2GB prt# 1
2GB prt# 1
2GB prt# 1
2GB prt# 2
2GB prt# 2
2GB prt# 3
2GB prt# 3

Should the prt#1 sticks go in slots 1 & 2 on both risers or all on the same riser.

If you read the name of the post I said I was splitting hairs.
 
You've got 8 X 2GB sticks. Even though 4 of them are from the same manufacturer, they are all considered identical. Your order is fine, as is every other combination, because they are all matched.
 
Shelob said:
With out going into it I have 8GB (4x2) matched (for real, all 4 have the same part #) and 2 sets of 4GB (2x2) matched.

Based on what I've read I put the 8GB matched in riser 1 slot 1 & 2 and riser 2 slot 1 & 2 and 1 4GB matched in slot 3 & 4 on each riser. Does this seem right or should I have the 8GB on the same riser. Or does it make no real difference.
Click to expand...

Sounds good. If you really wanted to split hairs you could put the "better" brands in riser 1 slot 1 & 2 and riser 2 slot 1 & 2. That's if the three groups are different manufacturers.
 
Thanks for the help. That is the way I put them in, the 4 are in slots 1 & 2 on both risers.
 
krye said:
If you really wanted to split hairs you could put the "better" brands in riser 1 slot 1 & 2 and riser 2 slot 1 & 2.
Click to expand...

What does that mean? RAM is RAM. If it meets the specs it was designed for then it's all the same, no better or no worse than any other brand. Whether it's Hynix (Apple's RAM), Samsung, OWC, NuImpact, Crucial, Certified, etc etc etc it's just the same performing RAM. Don't worry about it.
 
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