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Overclocking Mac Pro 1.1, dual quad 3.0ghz, 32 gigs ram, 7970


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#1
cash68

cash68

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Hi, I have a decently stout Mac Pro 1.1 and I'm looking for a bit more power for some animations I've been working on.   So far, this is what I have:  

 

Dual Quad Xeon X5365s

32 gigs ram

SSD for OSX

SSD for Win7

Modded 7970, I'm pretty sure this is the fastest card available that still displays boot screens correctly.

 

I've done some reading about the BSEL mod, and the VID mod, but have not found anyone who has done this with my processors.  Does it work much the same?   What else can I do?



#2
Hervé

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Xeon X5365 CPUs are top of the Clovertown range and run at maximum FSB 1333MHz. To apply BSEL/VID mod overclocking, you would need:

  1. CPUs with lower FSB than the highest supported by the chipset (here, Intel 5000X which supports FSB 1066 & 1333)
  2. CPUs with a higher max. multiplier than your current X5365 models

You evaluate your gain by calculating the target max. CPU speed, i.e. multiplying max. multiplier by FSB/4 (because FSB is quad-pumped). For instance, your current X5365 CPUs run at 3.0GHz, a speed obtained by multiplying 1333/4 by max. multiplier 9. If the new CPUs have a large L2 cache, this can significantly improve performance too.

 

In the Clovertown series, the only models with a lower FSB and a higher multiplier would be the Xeon E5350/X5350: FSB 1066 + max. multiplier x10. In theory and if they exist (because they're not listed on Intel Ark), you could therefore opt for those CPUs and overclock them to FSB1333 through pinmod/voltmod to obtain CPUs @3.33GHz. That would be a 25% increase over their original speed but a mere 11% over your existing CPUs, making the exercise hardly worthy in my opinion.

 

MacPro1,1 shipped with WoodCrest dual-core Xeon CPUs (best CPU was Xeon 5160). You've got Clovertown quad-core models @3.0GHz (as in the MacPro2,1) and, apart from the highly unlikely upgrade I've just mentioned above, that's the best you can get on this 11yr-old machine. Afaik, Harpertown Xeon CPUs (last LGA771 series, up to FSB 1600) as fitted to MacPro3,1 (Intel 5400 chipset) are not compatible with MacPro1,1/2,1. I understand that Intel 5000X chipset would support them but MacPro1,1/2,1's EFI/Firmware does not.

 

If you need more info:

http://www.everymac....dex-macpro.html

https://en.wikipedia...microprocessors

http://www.cpu-upgra...ets)/5000X.html

https://forums.macru...ro-1-1.1433720/



#3
cash68

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Ah, alright.  It's fine if this machine is fully maxxed out; it still does what I want and runs amazingly well.   In fact, it sort of blows my mind that this thing is a decade old but still runs modern OSs and modern programs as well as it does.  







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