Date: Wed, 30 Apr 2008 09:09:05 +0800
To: "Adam hewitt" <[EMAIL PROTECTED]>
From: Jude <[EMAIL PROTECTED]>
Subject: Re: New iMac Advice
Cc:
Bcc:
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But if you're not intending to send your Mac into space, is it OK to
buy third party RAM? :P
Keep in mind that the genuine Apple RAM is ECC Registered, where as any RAM
you buy is likely to be non-ECC registered unless you spend quite a bit of
money on it.
ECC registered RAM as listed by Wikipedia.org is:
Error-correcting memory
Main article: Dynamic random access memory#Errors and error correction
Because soft errors are extremely common in the DRAM of computers used in
satellites and space probes, such memory is structured as ECC memory (also
called "EDAC protected memory"). Typically every bit of memory is refreshed
at least 15 times per second. During this memory refresh, the memory
controller reads each word of memory and writes the (corrected) word
back.[citation needed] Such memory controllers traditionally use a Hamming
code, although some use triple modular redundancy. Even though a single
cosmic ray can upset many physically neighboring bits in a DRAM, such memory
systems are designed so that neighboring bits belong to different words, so
such single event upsets (SEUs) cause only a single error in any particular
word, and so can be corrected by a single-bit error correcting code. As long
as no more than a single bit in any particular word is hit by an error
between refreshes, such a memory system presents the illusion of an
error-free memory. [1]
Read more here:
http://en.wikipedia.org/wiki/ECC_memory#Error-correcting_memory
Adam.
-----Original Message-----
From: WAMUG Mailing List [mailto:[EMAIL PROTECTED] On Behalf Of Dark1
Sent: Tuesday, 29 April 2008 7:15 PM
To: WAMUG Mailing List
Subject: Re: New iMac Advice
I think it's always been exceptionally cheaper to buy RAM separate
from your Apple purchase but that was when you could keep your
standard RAM chips and add in extra ones yourself. I think the iMac
only has the 2 RAM chips that come preloaded so you'd be replacing 2GB
of RAM if you wanted to upgrade using non-Apple purchased RAM.
In terms of hard drive space you can easily get an external one at a
later date if you end up needing it for a decent price. In your shoes
I would go for a bit more hard drive space than I think I'd need but
not worry about maxing it.
> Dear WAMUGgers
>
> If I was *tempted* to buy a new iMac 24" 3.06GB at Apple Ed price of
> $2787, would it be good value to upsize to 4GHz RAM instead of 2GHz
> (2 x 2 GHz v 2 x 1GHz) for an extra $269.50, and to upsize the HDD
> from its 500GB to 750GB [Plus A$ 135.30] or to 1TB [Plus A$
> 333.30]? I'm not really worried about upgrading to wireless mouse
> and keyboard at this time.
>
> The specs look Ok to me out of the box for what we currently need,
> but I've always subscribed to the good advice of getting the highest
> specs we can at purchase.
>
> Would it be better to update later, if needed, with Apple or non-
> Apple hardware?
>
> Daniel, other? Just dreaming but Elaine's Ruby iMac is getting very
> slow with Tigger and all her digital pics and rellie's PPTs on
> board. We'll need a new baby to do it all on one day soon.
>
> Regards
>
> Reg
>
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