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56GB of RAM possible in 2006/2007 Mac Pro (1,1/2,1)?

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Mr. Zarniwoop

macrumors demi-god
Original poster
Jun 9, 2005
752
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Apple only supported 4GB FB-DIMMs in these models, for a total of 32GB RAM.

However, the chipset was always suspected to support 64GB with 8GB FB-DIMMs, but everyone who tried this only had RAM recognized up to 32GB RAM.

But today there's an interesting post on netkas of someone who used mostly 8GB FB-DIMMs and left two 4GB FB-DIMMs in the last two spots of the second riser.

The apparent result? 56GB RAM in a MacPro2,1

Very interesting if it really works properly.
 

frostart

macrumors newbie
Oct 9, 2014
1
2
This my message on netcas.org. I established this memory three years ago. I established 56 Gb only because any more there was no such memory.:) It was necessary to put two modules on 4 Gb for bank filling. I tested memory in TechTools 7 - everything normally. Sorry for my English.:)
 
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FireArse

macrumors 6502a
Oct 29, 2004
896
106
Apple only supported 4GB FB-DIMMs in these models, for a total of 32GB RAM.

However, the chipset was always suspected to support 64GB with 8GB FB-DIMMs, but everyone who tried this only had RAM recognized up to 32GB RAM.

But today there's an interesting post on netkas of someone who used mostly 8GB FB-DIMMs and left two 4GB FB-DIMMs in the last two spots of the second riser.

The apparent result? 56GB RAM in a MacPro2,1

Very interesting if it really works properly.

This is very interesting - sadly my RAM supplier of choice (Crucial) no longer supply the part. Where are you recommending we buy RAM in the UK?
 
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profinite

macrumors member
May 1, 2009
98
15
2006 Mac Pro (MacPro1,1)
Flushed to 2,1 firmware
Two Xeon X5355’s [Purchased February 25, 2014 for $45]
Macosxbootloader v3.1
64GB RAM (8 x 8GB) [Purchased November 18, 2015 for $199]

 
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nigelbb

macrumors 65816
Dec 22, 2012
1,036
202
This is very interesting - sadly my RAM supplier of choice (Crucial) no longer supply the part. Where are you recommending we buy RAM in the UK?
If you want 667MHz FB-DIMMs there are loads of cheap used parts on eBay pulled from Dell & HP servers. I have upgraded all three Mac Pro 3,1s in my household to 32GB & these parts will work in a 1,1 just fine. This is 32GB (8x4GB) from the US but they will ship to UK for about $50 all in (around £35) http://www.ebay.co.uk/itm/32GB-8x4G...973065?hash=item1ea3f83ac9:g:NikAAOSwcdBWTQGM
 
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