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Intel Xeon's E5345 on Mac Pro 3,1 logic board

S

Spacedust

macrumors 65816
Original poster
May 24, 2009
1,008
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Will it run or only Xeon 5400 series are supported ?

Can I put slower 5400 series like E5405 2.0 GHz ?
 
e5345 will work in the 1,1 mac pro. I don't know for sure that it doesn't in the 3,1 machines, but I wouldn't count on it.

Spacedust said:
Will it run or only Xeon 5400 series are supported ?

Can I put slower 5400 series like E5405 2.0 GHz ?
Click to expand...
 
I'm still worried that I've got wrong stepping in my CPU's on Mac Pro 2008, so it's not booting.

I got SLBBN, while Apple was using always SLANT.

There will be an Apple expert on wednesday visiting the service center where my Mac Pro 2008 is being repaired :)

Everything is working, but no chime and no video :/ They've never seen such issue before.
 
These were the E5462's right? Any chance you could get a hold of an SLANT stepping? There are post somewhere that show it'll run with just one processor so you don't need a pair. Really any processor with a CPUID of 10676h should work as the microcode for this is included in the firmware.

I'm VERY interested in how this turns out, please keep us posted!
 
hyram said:
These were the E5462's right? Any chance you could get a hold of an SLANT stepping? There are post somewhere that show it'll run with just one processor so you don't need a pair. Really any processor with a CPUID of 10676h should work as the microcode for this is included in the firmware.

I'm VERY interested in how this turns out, please keep us posted!
Click to expand...

Currently not :/ I will post news in my thread :)
 
It's confirmed that this board will not work with SLBBN ! SLANT only if you want E5462. I need to grab pair of these :/
 
hyram said:
Really any processor with a CPUID of 10676h should work as the microcode for this is included in the firmware.
Click to expand...

This is crucial thing - all SLBBx CPUs have CPUID 1067Ah and E0 stepping.
So, C0 stepping CPUs (SLANx) are only upgrade options for MP 2008. This means, that X5492 will never work in those MPs.

Spacedust said:
Will it run or only Xeon 5400 series are supported ?

Can I put slower 5400 series like E5405 2.0 GHz ?
Click to expand...

No, 5405 has 1333 FSB and will not work (maybe will with BSEL mod, but i don't know for sure is it possible with MP 08).

Slowest you can use is 5462.
 
Space, Please provide as much detail as you can as to how it was comfirmed that the SLBBN parts won't work. Thanks!
 
I will get 2 pieces of SLANT soon. Also I will test my current SLAC5 and SLAEJ (E5345's) just to make an experiment if it support Xeon 5300 series.
 
The microcode for both the SLAEJ and SLAC5 is in the mp3,1. But this will be an interesting test as the bus speed for both of these is 1333MHz while the logic board is really designed for 1600MHz. In theory this should work, just at the lower speed.

Can't wait to see the results. How soon before you can test this?
 
hyram said:
The microcode for both the SLAEJ and SLAC5 is in the mp3,1. But this will be an interesting test as the bus speed for both of these is 1333MHz while the logic board is really designed for 1600MHz. In theory this should work, just at the lower speed.

Can't wait to see the results. How soon before you can test this?
Click to expand...

This week I will get my Mac Pro from service and do all tests. I hope my new logic board is OK.

Service guy will call me tommorow and tell me which CPU's they've tested.

Some people who's got currently Mac Pro 2008 2.8 GHz can update their machines to E5472/X5472 3.0 GHz or X5482 3.2 GHz in future if these CPU's will be in good prices. Someone on the web already did that and it works. No need to change motherboard or radiators. These processors are very cool when idle ;)
 
GREAT NEWS !!! Got my Mac Pro from service today, so I've opened my old Mac Pro 2006 and taken one of my E5345 and putted into Mac Pro 2008.

And hey.... it works ! Mac OS X got kernel panic (probably due to wrong FSB), but Windows 7 Ultimate 64-bit is working with 1 problem: I cannot set correct date, because it will freeze and fans will spin at 100% :/

So all I have to do now is to grab a pair of SLANT's and I'm done :D
 
I've changed the battery and used the firmware restoration CD, but still cannot change date in Windows 7, so it's something with processors.

So using Xeon's 5300 series in Mac Pro 3,1 (2008) is not recommended ! Use them only to test the logic board if you don't have 5400 series with FSB 1600 (E5462 and higher).

X5492 is not supported !
 
My former 2008 mac pro which..

was a 3.00 ghz had the E0 chip in it.. and thus I think the 3.4 will now work in it.. I have www.desktarz.com checking it out for me.


666sheep said:
This is crucial thing - all SLBBx CPUs have CPUID 1067Ah and E0 stepping.
So, C0 stepping CPUs (SLANx) are only upgrade options for MP 2008. This means, that X5492 will never work in those MPs.



No, 5405 has 1333 FSB and will not work (maybe will with BSEL mod, but i don't know for sure is it possible with MP 08).

Slowest you can use is 5462.
Click to expand...
 
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