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64 bit Standard(S) - Page 3

post #41 of 44
9/19/06 at 4:34pm
I am sure that the MacPro is running a 64-bit OSX. Which means the chipset is the limit (8GB) The same chipset can go to 64GB.

I thought there was a 64-bit OSX for the G5...but I am pretty clueless about the G5.

I would guess that all the intel macs execpt the MacPro are running the 32-bit OSX
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post #42 of 44
9/19/06 at 5:34pm
Quote:
Originally Posted by gonzo
I am sure that the MacPro is running a 64-bit OSX. Which means the chipset is the limit (8GB) The same chipset can go to 64GB.

I thought there was a 64-bit OSX for the G5...but I am pretty clueless about the G5.

I would guess that all the intel macs execpt the MacPro are running the 32-bit OSX

The Mac Pro is running 64bit OSX and actually supports up to 16GB. The new XServe supports 32GB. The G5 Power Mac (of which I own two quads) is also running 64bit OSX and it has 8 DIMM slots and supports either 8 or 16GB. 8 for sure as I have 8GB installed in one and 4GB in the other, I don't know if it supports the 2GB modules and can address more than 8GB though.... 64bit OSX also runs on the iMac G5 which allows for installation and full addressability of 4GB. It's a shame that the switch to Intel in the iMac and notebook lines actually took us a step back in the memory department. Admittedly, most people don't need 4GB in a notebook or iMac configuration right now and while I'm doing a lot of whining, I suppose I can live with 2GB if need be. Which is probably what I'll have to do because I can't wait much longer to be mobile again. The Dell notebook is definitely out of the question now... Same RAM limitations as Apple or anyone else, but no TMDS dual-link support on their Quadro 2500M even though it should have it.
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post #43 of 44
9/19/06 at 5:59pm
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post #44 of 44
9/23/06 at 5:34am
Quote:
Originally Posted by AppliedVisual
Easy to get confused with this stuff. Anyway, I dug through the technical details I could find on the various Intel chipsets and it looks like we are dealing with a chipset limitation as Gonzo has stated. I'm not sure which chipset is being used in the MBP and the Macbook -- the 945PM and 945GMS respectively, I think. Anyway, all these chipsets are limited to 4GB. Looking through some other discussions elsewhere, it seems that many people think that Intel released Merom (mobile Core 2 Duo CPU) as soon as it was ready even though its companion chipset is not ready. Yes, Merom is compatible with all current Yonah (mobile Core Duo CPU) chipsets, but is not 100% supported. So by installing a Core 2 Duo in a MBP or iMac right now, we get 64bit support and instructions from the CPU and the OS, but the primary chipset is still limited to 32bit functionality and addressing, so we're still stuck with the same 32bit memory limitation as with the Core Duo CPUs. The Core 2 Merom CPUs are probably still worth the wait if you're sitting on the fence right now (like I am) because they do offer a noticeable speed boost. ...They also run a bit hotter too.

So I guess we just wait and see what comes down the pipe. I wonder if Apple may hold off on new MBP's until the Santa Rosa chipset ships? In some ways that's logical, but it may also cost them a lot of sales in the mean time...

Actually Apple might just do that, if they are smart. it just isn't worth uprading to Merom if you already have Yonah. In fact anandtech did a bunch of benchmarks and it is their conclusion too to wait for Santa Rosa if you already have merom.

Smit
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