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Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: AllGold
Date: August 08, 2020 04:28PM
Poll
24GB at 1333GHz or 32GB at 1066GHz?
Only registered users are allowed to vote for this poll.
5 votes were received.
24GB at 1333GHz 3
 
60%
32GB at 1066GHz 2
 
40%



I just upgraded from 16GB to a 32GB kit (4x8GB) thanks to our sponsor.

I expected to see a small drop in electricity usage with 3 DIMMs rather than 4 DIMMs, but can't see any real difference with my Kill-A-Watt.

Populating only the first three slots gives you a boost in memory speed.

By the way, the previous 16GB was more than enough so it's not like I would miss the extra 8GB. Also, just to be clear, this is a single-CPU tray 3.33GHz 6-core.







Edited 3 time(s). Last edit at 08/08/2020 04:47PM by AllGold.
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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: Article Accelerator
Date: August 08, 2020 04:53PM
Quote
AllGold
I just upgraded from 16GB to a 32GB kit (4x8GB…I expected to see a small drop in electricity usage with 3 DIMMs rather than 4 DIMMs…

I'm so confused. So you went from using 2 slots to 4 (i.e. 16 to 32) or did you go from using 2 slots to 3 (i.e. 16 to 24)?

Quote

Populating only the first three slots gives you boost in memory speed.

I think it allows you to use 1333 rather than 1066.
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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: AllGold
Date: August 08, 2020 05:01PM
The previous 16GB was 4x4GB.

All I know is 4 slots runs at 1066 and 3 runs at 1333. I'm just not sure if it makes any noticeable difference in performance.



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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: Racer X
Date: August 08, 2020 05:18PM
MORE CORES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



********************************************
The police have no duty to respond. See Castle Rock v. Gonzales, 545 U.S. 748 (2005) or Warren v. District of Columbia[1] (444 A.2d. 1, D.C. Ct. of Ap. 1981)
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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: MrNoBody
Date: August 08, 2020 06:15PM
Quote
Racer X
MORE CORES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
agree smiley

and 1333GHz DRAM in THREE/bank config.

2009 cMP 5,1; w/ Dual Hex Core X5670; 3x 8GB 1333 * Two (48GB total).



39°36'17"N 75°44'43"W

The search engine that doesn't track you.

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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: anonymouse1
Date: August 08, 2020 07:29PM
What are the latencies on the difference sets of RAM (CAS numbers)?

What are you using it for?
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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: jdc
Date: August 08, 2020 07:44PM
Doesnt matter? Insigificant?

If 16 Gb was fine... was there a reason dropping $100 for it? Just the power savings?

I would think moving to all SSDs vs spinners would save some energy, if thats the goal.



----


Edited 999 time(s). Last edit at 12:08PM by jdc.
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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: Buzz
Date: August 08, 2020 07:52PM
If you've got it, flaunt it!
==



Sometimes it is what it is...
and then there's times when it's really better.



==



Edited 1 time(s). Last edit at 08/08/2020 07:52PM by Buzz.
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Re: Mac Pro 5,1 RAM - 24GB at 1333MHz or 32GB at 1066MHz?
Posted by: AllGold
Date: August 10, 2020 04:13PM
Before I even did the upgrade I realized I made a miscalculation. I was basing my potential electricity savings on the ancient recollection of the original Mac Pro 1,1. Those machines used 12 watts per DIMM pair and DIMMs had to be installed in pairs. With the current machine, it would be the difference of only one DIMM so at best I would get a 6 watts savings. Plus, I suspected the modern DIMMs might use less juice.

But I was surprised to see no difference in power usage. I assume what little power savings there was from the missing DIMM was eaten up by running the RAM at the higher clock speed and requiring more juice.

If 16 Gb was fine... was there a reason dropping $100 for it? Just the power savings?


It was a Garage Sale score so a good bit less than $100. I'd been watching for a deal for quite a while and finally snagged one.

I think I will stay with the full 32GB since there's no difference in power. From my reading, the faster RAM is significant in memory-intensive tasks but virtually unnoticeable in general use. The machine's performance has never left me wanting for more.

And just for the record, at idle my machine with five internal drives (one SSD on a PCIe card) draws about 120 watts.



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