Een van de mogelijke oorzaken is een fout(-je) in één van de geheugen modules. Het probleem kan na de installatie van Vista prominenter worden en meer op de voorgrond treden. Vista gebruiikt het geheugen anders dan XP of 2000.
1e gebruikt Vista zoveel mogelijk geheugen, terwijl b.v. XP, dat wacht totdat het geheugen echt nodig is. De Task Manager (en andere soortgelijke programma's) rapporteren dan ook een hoger geheugen gebruik dan XP.
2e gebruikt Vista stukken geheugen in een volstrekt willekeurige volgorde. XP daarentegen begon aan het begin van een geheugen blok en ging vandaar uit verder op souperen. De methode van Vista is ingegeven om hackers en andere kwaadwillenden het leven zuurder te maken.
Deze 2 factoren houden dan wel in, dat Vista veel eerder en heftiger zal reageren op kleine geheugen problemen, dan XP.
Een uitgebreide geheugencheck zal in dit geval uitkomst moeten brengen. Veel systemen hebben tegenwoordig diagnostische programma's binnen de sfeer van de BIOS / Set-up, of anders los bijgeleverd. Voorbeeld: Dell heeft een diagnostisch programma voor alle systemen, die zij verkopen. Hierbinnen zitten routines om alles wat los en vast zit te testen, ook het geheugen. Ook kan men gebruik maken van b.v.Memscope (van het bedrijf Micro 2000, o.a. de makers van Universal Diagnostic Toolkit, Micro-Scope en Post Probe . Producten, die wij zelf al vele jaren gebruiken {al sinds de tijd van de IBM PS/2 machines}). Bij gevonden fouten "eventueel" memory (laten) vervangen. Hierbij een artikel met soortgelijke ervaringen:
Vista PCs: Suffering From Memory Loss? (27/03/2007)
Reader Gary Priester has a question likely to be faced by other buyers of
computers outfitted with Vista, the latest Microsoft operating system:
strong I just purchased a new Dell [computer] with Vista. I ordered 4GB of
RAM and a 320GB hard drive. When I first booted the machine, it showed only 3GB
of RAM and a 288GB drive.
After much going back and forth with Dell [ ticker DELL /ticker ], both on
the phone and via e-mail, finally one of the tech-support persons explained
that the difference is Vista uses binary to measure memory, whereas the
traditional way is to calculate by the decimal equivalent.
It made sense, and they have a chart hidden somewhere deep in the bowels of
their Web site that shows the equivalents. This is probably something that
should be pointed out to consumers in the first place and would have saved Dell
and me a lot of time. /strong
Dell s explanation may make sense, but it doesn t
answer your memory question. Yes, what we commonly refer to as a megabyte [1
million bytes] of memory is actually 1,048,576 bytes. But that isn t the issue
here.
The confusion may be related to a somewhat obscure issue called memory
addressing. Until recently, Windows and the hardware it runs on have used
32-bit addressing. This limits total memory to what can be represented by a
32-bit binary number, a bit more than 4 billion bytes. Your new computer almost
certainly came with the 32-bit version of Vista. Although there is a 64-bit
version, it s not being used much because it has, to now, extremely limited
support for third-party hardware.
And if your computer is a laptop with an Intel [ ticker INTC /ticker ]
processor, the chip that handles memory addressing, known in computer-speak as
the northbridge, can only handle 32-bit addressing, even though the Core Duo
and Core 2 Duo chips themselves are 64-bit models.
This limits you to 4GB of physical memory. But the available user memory is
less than that [3GB in your case] because the system reserves a chunk for its
own use. Click here to read a good Hewlett-Packard [ ticker HPQ /ticker ] paper
on the issue. While it deals with Window XP, it s equally applicable to Vista.
leadin New Chips on the Way /leadin Traditionally, memory modules grow by
powers of 2, so you can buy 512MB, 1GB, or 2GB. And the Core Duo architecture
requires that memory modules be added in matched pairs.
Later this spring Intel begins shipping new chips, code-named Santa Rosa,
that will allow full 64-bit operation, as is already possible on Intel and AMD
[ ticker AMD /ticker ] desktops. With luck, by that time Microsoft and
third-party software and hardware vendors will have added enough support to
make 64-bit Windows a more useful proposition.
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