The latter: the bus on the motherboard has only pins to address 16 Gb. In theory the motherboard can host more than 16 Gb, since it's got 4 slots and 8 Gb or more RAM modules are quite common, nowadays. It's the main CPU>RAM bus that it's too narrow.
The OS (Windows 7 64bits) has much wider addressable range. > -----Original Message----- > From: programming-boun...@forums.jsoftware.com [mailto:programming- > boun...@forums.jsoftware.com] On Behalf Of Dan Bron > Sent: Thursday, June 12, 2014 5:35 PM > To: programm...@jsoftware.com > Subject: Re: [Jprogramming] vas was 4GB is ? in 64 bit > > 16GB? As in the _virtual_ address space of applications running on your OS is > limited to 16GB? Or your machine can't host more than 16GB of _physical_ > RAM? The latter seems more likely to me. > > Please excuse typos; sent from a phone. > > > On Jun 12, 2014, at 10:11 AM, "Stefano Lanzavecchia" <s...@apl.it> wrote: > > > > Limits for Windows: > > http://msdn.microsoft.com/en- > us/library/windows/desktop/aa366778(v=vs. > > 85).aspx Hardware can put stricter restrictions: the motherboard of my > > PC has a bus with enough pins to address only 16G and that's it. > > -- > > Stefano > > > >> -----Original Message----- > >> From: programming-boun...@forums.jsoftware.com > [mailto:programming- > >> boun...@forums.jsoftware.com] On Behalf Of bill lam > >> Sent: Thursday, June 12, 2014 4:02 PM > >> To: programm...@jsoftware.com > >> Subject: Re: [Jprogramming] vas was 4GB is ? in 64 bit > >> > >> I don't think current cpu hardware or os can support full 2^64 address > space. > >> > >> Probably in the range of 2^48 > >> > >>> On 12.06.2014, at 21:05, Björn Helgason <gos...@gmail.com> wrote: > >>> > >>> A process has a 4GB virtual address space (VAS); each address from 0 > >>> to 2^32 can have a byte value. > >>> > >>> Is this 2^64 in 64 bit? > >>> -------------------------------------------------------------------- > >>> -- > >>> For information about J forums see > >> http://www.jsoftware.com/forums.htm > >> > >> --------------------------------------------------------------------- > >> - For information about J forums see > >> http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > > For information about J forums see > http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
