Sa mergi pe varianta pe 32 de biti cu incredere, chiar daca vei “pierde” 1 Gb de RAM.
macexpert - 08 Mai 2008 09:44 PM
Ce nelamurire am eu, poate se gaseste cineva sa-mi raspunda: procesoarele intel core 2 duo am inteles ca au 64 biti. Si alea intel core duo tot 64 aveau? Si daca tot discutam, cum se explica ca macu a introdus aceste ultime macbook-uri si au doar 3MB L2cache pe ele, la 4GB ram? Pai alea vechi aveau 4MB pt 2GB ram si astea doar 3? Este intr-adevar un downgrade sau e altceva in spate?
1.intel dual core are EMT64 care emuleaza executia codului si nu este pe 64 de biti cum este intel core 2 duo.
2.
A 32-bit register meant that 2^32 addresses, or 4 GBs of RAM, could be referenced.
orice sistem pe 32 de biti poate sa aloce maxim 4 GB = 4.096 MB = 4.194.304 KB = 4.294.967.296 Biti (care e de fapt 2 la puterea 32)
ceva interesant : http://www.neowin.net/forum/index.php?showtopic=499870
Enable support for 4GB of RAM (or more) in Vista 32-bit
On a computer that has 4 GB of RAM, the System Properties dialog box and the System Information dialog box may report less memory than you expect. This problem occurs because the address space is limited to 4 GB in a 32-bit hardware environment. Memory may be relocated to make room for addresses that the basic input/output system (BIOS) reserves for hardware. However, because of this limitation, Windows Vista cannot access memory that is relocated above the 4 GB boundary.
Solution: Open an elevated Command Prompt, type BCDEdit /set pae ForceEnable and press Enter.
The pae parameter enables Physical Address Extension (PAE). On 32-bit versions of Windows, PAE is disabled by default. PAE is an addressing strategy that uses a page-translation hierarchy to enable systems with 32-bit addressing to address more than 4 GB of physical memory. PAE also supports several advanced system and processor features, such as Data Execution Prevention (DEP; “No execute”), Non-Uniform Memory Architecture (NUMA), and hot-add memory, so it is also used on computers with less than 4 GB of memory. PAE must be supported by the processor.
On a computer that supports hardware-enabled Data Execution Prevention (DEP), PAE is automatically enabled when DEP is enabled and automatically disabled when you disable DEP. To enable PAE when DEP is disabled, you must enable PAE explicitly: Open an elevated Command Prompt.
Type BCDEdit /set nx AlwaysOff & BCDEdit /set pae ForceEnable and press Enter.
Nu am incercat ca nu am instalat vista, dar e credibil 
3. http://www.anandtech.com/mac/showdoc.aspx?i=3246&p=12 in acel cache sunt stocate date pe care procesorul le-a accesat. Faptul ca sunt 3 Mb in loc de 6 poate sa afecteze performantele, in link este aratat asta.
4. Faci o corelatie gresita cu “4MB pt 2GB ram si astea doar 3”, cantitatea de cache a procesorului nu are legatura cu cantitatea de memorie in sistem. Faptul ca am un procesor cu 2X1 Mb de cache nu inseamna ca nu pot avea 4 Gb de Ram, sau 16 Gb de Ram pe placa de baza, si sistemul de operare sa ii poata vedea ( cel pe 32 de biti va vedea maxim 4 GB, iar cel pe 64 va vedea pana la 16 Gb)