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G5 (recycling PCs DDR)
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Fresh-Faced Recruit
Join Date: Jul 2003
Status:
Offline
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Hi yo!
I did just order a G5 1,8GHZ (tired of my PC) and wonder if anyone
know if it will be possible to use my P4s two 333MHZ 512MB DDRs?
I read that the G5 accept both 400mhz and 333mhz, but will the
addition of 333mhz slow the 400mhz down (like it works on the PC)?
If it slows it down I still think it will be better to use 1,5gb of
333MHz than 512mb of 400MHz, again maybe the PC memory wont work at
all in the mac? :-O
// Henrik
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Mac Elite
Join Date: Dec 2001
Location: Atlanta, GA, USA
Status:
Offline
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Originally posted by Nodnibs:
I did just order a G5 1,8GHZ (tired of my PC) and wonder if anyone
know if it will be possible to use my P4s two 333MHZ 512MB DDRs?
Don't do it. Even if it works, it'll slow down the machine. Just get some 400MHz RAM and sell the 333 on eBay.
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Mac Pro 2x 2.66 GHz Dual core, Apple TV 160GB, two Windows XP PCs
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Mac Elite
Join Date: Feb 2003
Status:
Offline
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Originally posted by Arkham_c:
Don't do it. Even if it works, it'll slow down the machine. Just get some 400MHz RAM and sell the 333 on eBay.
In the tech doc it says its fully supported though. Here
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Posting Junkie
Join Date: Oct 2001
Location: South of the Mason-Dixon line
Status:
Offline
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I thought the 1.6GHz models used PC333 and the 1.8 & 2.0GHz models used PC400.
In that respect, the G5 PowerMac does support PC333 and PC400 - It's just that Apple chose to equip their G5s with one or the other depending on that model's CPU speed.
As a guess, I'd say that adding PC333 RAM to a system that has PC400 RAM installed would result in all RAM running at 333MHz DDR. Well, assuming the firmware auto-detects the information contained in the RAMs 'SPD' (and assuming the SPD is programmed correctly) - and the firmware adjusts RAM settings accordingly.
In other words, I doubt that individual RAM banks have exclusive parameters. All RAM banks share the same timings. The logical 'fail-safe' setting would have to be no faster than the slowest installed RAM...which is 333MHz DDR in the case of mixing PC400 & PC333.
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Fresh-Faced Recruit
Join Date: Jul 2003
Status:
Offline
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Ah, I reckon then its not realy worth sticking to the 333:s.
If the G5 turns out the way I expect it too I can probably sell of
the P4 and finance some extra 400 ddr that way 
Im gonna check out that acrobat file now!
Thanks for your replys ! 
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