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new 64 bit thing
- Thread starter andré2005
- Start date
Here is Intel's answer to your question:
http://support.intel.com/support/processors/pentium4/sb/CS-016727.htm
The Pentium 4s that support 64-bit execution are the following:
Pentium 4 600-series processors.
Pentium 4 800-series processors (unavailable to date).
Pentium 4 'F' designated processors (3.40F, 3.60F, etc.)
http://support.intel.com/support/processors/pentium4/sb/CS-016727.htm
The Pentium 4s that support 64-bit execution are the following:
Pentium 4 600-series processors.
Pentium 4 800-series processors (unavailable to date).
Pentium 4 'F' designated processors (3.40F, 3.60F, etc.)
andré2005 said:the j in the new intel cpus mean it is 64bit also huh? does this mean all i have to do is buy a j processor and i have a 64bit system? yes/no any one know?
J is just non-execute bit, which has nothing to do with 64-bit, there is other nomenclature for the 64-bit processors
what is it then?ScHpAnKy said:J is just non-execute bit, which has nothing to do with 64-bit, there is other nomenclature for the 64-bit processors
so em64t mean processor can run 64bit applics. !?
The "no-execute bit" is essentially a configurable option that allows programmers (OS-level, typically) to block the execution of programs that attempt to gain access to the memory for malicious purposes. Intel calls this feature the "XD bit", which stands for eXecute Disable. This option is called the "NX bit" by AMD and Transmeta, meaning No eXecute.
EM64T is Intel's x86-64 scheme. Procesors with this feature can run both 32- and 64- bit x86 code. That doesn't mean that they can run other 64-bit code, like EPiC/IA-64, though you're not likely to encounter other forms of code.
EM64T is Intel's x86-64 scheme. Procesors with this feature can run both 32- and 64- bit x86 code. That doesn't mean that they can run other 64-bit code, like EPiC/IA-64, though you're not likely to encounter other forms of code.
Perhaps some people are wondering why it's referred to as a bit. The feature is located on one of many registers found within the processor. Registers can be considered rows of on/off switches. They can be filled with data, which are represented by zeros and ones, ons and offs. Other registers are more like configuration switches for processor features.
So where am I going with this? Registers are described in terms of bits. A 32-bit register has 32 on/off switches. Each switch is referred to as a bit. Thus, the XD bit in a J-series Pentium 4 is located as a single switch in a register somewhere deep inside the processor. With the proper code, one can operate this switch by configuring the register that XD bit is located in.
So where am I going with this? Registers are described in terms of bits. A 32-bit register has 32 on/off switches. Each switch is referred to as a bit. Thus, the XD bit in a J-series Pentium 4 is located as a single switch in a register somewhere deep inside the processor. With the proper code, one can operate this switch by configuring the register that XD bit is located in.