http___macgateway.com_windows_why-doesnt-windows-see-all-of-my-computers-memory__lang_hr_1.xml
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New! Gizmo's Security Advice Wizard: Free security suggestions customized to your needs. Get started Last Update: Sat, 09/05/2009 - 07:28 — abhishek Very often we find ourself thinking: Will this 32 bit software run on my 64 bit operating system? or Will this 64 bit software run on my computer? Here's a short tutorial which attempts to answer these questions and helps us understand the concepts of 64 bit and 32 bit hardware, operating system and applications. 32 bit systems have been part of the mainstream computing for more than a decade since the time of the 80386. Therefore, most of the software and operating system code written during this time has been 32 bit compatible. 32 bit systems can address up to 4 GB memory in one go. Some modern applications require more memory than this to complete their tasks. This and progress in chip fabrication technology led to the development of 64 bit processors for mainstream computing. So here comes the problem, much of the software available today is still 32 bit, but the processors have migrated to 64 bit. The operating systems are slowly catching up. Eventually even the applications will catch up. But for now, we have to cope up with all combinations of 32 and 64 bits in hardware, operating system and applications. You can consider these three factors to be three layers with the processor as the lowest layer and the application as the highest layer as shown below: Processor, OS and application hierarchy To run a 64 bit application, you need support from all lower levels (64 bit OS and 64 bit processor). To run a 64 bit OS, you need support from its lower level (a 64 bit processor). A 32 bit OS will run on a 32 or 64 bit processor without any problems. Similarly a 32 bit application will run on any combination of OS and processor (except a combination of 32 bit processor and 64 bit OS which is not possible). This is usually accomplished through emulation which is an operating system feature, part of all major operating systems. Device drivers run in parallel to the operating system. Emulation is done at the operating system level, and is available to its higher layer: the application. Therefore, it is not possible to install a 32 bit device driver on a 64 bit operating system. Answers to common questions Will a 64 bit CPU run a standard (32-bit) program on a 64-bit version of an OS? Yes it will. 64 bit systems are backward compatible with the 32 bit counterparts. Will a 64-bit OS run a standard application on a 64 bit processor? Again, it will. This is because of backward compatibility. Can I run W2K and WXP on an 64 bit CPU, and use old software? Yes, a 32 bit OS (W2K and WXP) will run on a 64 bit processor. Also, you should be able to run "old software" on a 64 bit OS. However, before I close, let me also quote that many times, a 64 bit software will contain bits of 32 bit code. Similarly 32 bit software (usually very old ones) can have some code in 16 bit. Please be aware that 16 bit code will NOT run on 64 bit OS. This is one reason behind some 32 bit programs not working on 64 bit OSes. Go there... http://www.techsupportalert.com/content/32-bit-and-64-bit-explained.htm Don
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“Upravo sam nadograditi moje stolno računalo iz 2 GB memorije 4 GB s nadom da ću biti u mogućnosti koristiti ga za još godinu ili dvije prije nego što sam konačno razbiti i nadograditi. Međutim, Bio sam pozdravio s najviše neugodno iznenađenje kad sam ponovno pokretanje moj računalo. Kad sam u pravu kliknete “Računalo” i otišao “Nekretnine” da biste vidjeli podatke o sustavu, Windows izvijestili da sam imala samo oko 3.5 GB memorije instalirana. Zašto se samo Windows vidjeti neke od sjećanja koje sam instalirao? Može li jedna od memorijskih modula biti loše?” Ja mogu reći sa gotovo potpunom sigurnošću da postoji ništa krivo s vašeg računala ili memorije da ste instalirali. Najvjerojatnije, radite 32-bitnu verziju sustava Windows te su pošli na ono što je poznato kao “4 GB barijera.” Neke web stranice, kao što su Wikipedia, zapravo se odnosi na to što je “3 GB barijera” iz bilo kojeg razloga. Što se sve svodi na to da, kada je s 32-bitni operativni sustav, you have a maximum of 2^32 or 4,294,967,296 possible memory locations that the computer can address, što znači da se 4,096 MB. Ovo ograničenje se odnosi na sve memorije u vašem računalu. Tako, na primjer, Ako imate grafičku karticu s 1 GB memorije, to će pojesti 1 GB dostupne memorije mjesta i ostaviti svoj operacijski sustav s 3 GB slobodnog RAM-a. Neki 32-bitni operacijski sustavi zaobići ovaj problem pomoću značajke zove Fizička adresa Extension (SITE) prevladati tu granicu i dopustiti računalu da iskoristi sve svoje instalirane memorije. Neki od operacijskih sustava koji podržavaju ovu značajku su Windows 2000 Advanced Server i Windows Server 2003 Enterprise Edition. Međutim, pomoću PAE možete izvoditi u određenim problemima. Neke matične ploče ne smiju imati odgovarajuću podršku za PAE, a kad operativni sustav pristupa memorije iznad 4 GB barijera, Računalo poduzima hit performansi. Budući da instalirate skup poslužitelj operativni sustav vjerojatno nije ono što je imao na umu, Vaš dvije najbolje opcije su ili staviti gore sa granice i shvatiti da je vaše računalo neće moći koristiti puni iznos instalirane memorije ili instalirati 64-bitnu verziju sustava Windows. Na primjer, 64-bitna verzija sustava Windows 7 Home Premium podržava do 16 GB memorije, dok Professional, Enterprise i Ultimate izdanja podržavaju do 192 GB. Mogu li instalirati 64-bitni operacijski sustav? Ako vaše računalo nije više stara nekoliko godina, to je vjerojatnije da je odgovor “Da.” Neki od Intelovih procesora koji podržavaju 64-bitni sustav Windows uključuje Temeljni i serije, the Srž 2 serija, the Pentium Extreme Edition series and many processors from the Pentium Dual-Core, Atom a Xeon product lines. Budući da Intel AMD suparnika razvio 64-bitni provedbu na koji Intel sada koristi za većinu svojih procesora, AMD je podržava 64-bitne operacijske sustave godinama. Neki od AMD procesora koji podržavaju 64-bitni sustav Windows uključuje Athlon 64, the Athlon II, the Athlon X2, the Opteron, the Turion a Phenom. Budući da 64-bitne verzije sustava Windows nemaju problema sa sustavom 32-bitni softver, možete instalirati jedan bez straha da će izgubiti mogućnost za instaliranje softvera koji. Uz pretpostavku da ćeš instalirati 64-bitni sustav Windows 7 ili Windows 8, iskustvo će biti gotovo isti kao što je bio s 32-bitnom operacijskom sustavu. Zapravo, u idućih godinu ili dvije, Svi kućnih računala su vjerojatno da će biti 64-bitni, tako da nemam ništa za izgubiti ako napravite prijelaz sada.