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Windows only recognizes 2gb, ***! - Page 2

post #11 of 19
I have a single 512MB GPU, and I register 3.25GB. If you have two 512MB cards, then you have 2.75GB. If you have two 1 gig cards... You have no choice but to go 64-bit.
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post #12 of 19
Quote:
try enabling PAE?
Do not , do not, I repeat, DO NOT enable PAE... otherwise you're in for a spectacular show of crashes and a following repair install...
post #13 of 19
Quote:
Originally Posted by bomfunk View Post
You do realise that to have PAE enabled you need to have PAE aware drivers, which 99.99% of people don't, and when you don't your computer crashes like an aeroplane that had its wings chopped off mid-air.

It certainly doesn't sound like you know what you're doing...

99.99% of people don't know how to enable PAE to start with; 99% of computer users aren't in the pursuit of performance... apparently, you are among them. That, and the whole fact that you are completely wrong about the drivers (only certain hardware needs to SUPPORT it.... doesn't need to have dedicated drivers). Which, based on the OP's sig rig, isn't an issue but w/e.
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post #14 of 19
PAE was designed for servers that needed to run a 32-bit OS due to compatibility problems with software that only ran under 32-bit, yet used large amounts of RAM. It is a huge performance hit and usually not recommended.
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post #15 of 19
Quote:
Originally Posted by Dennisjr13 View Post
PAE was designed for servers that needed to run a 32-bit OS due to compatibility problems with software that only ran under 32-bit, yet used large amounts of RAM. It is a huge performance hit and usually not recommended.
Quote:
In computing, Physical Address Extension (PAE) refers to a feature of x86 and x86-64 processors that allows more than 4 Gigabytes of physical memory to be used in 32-bit systems, given appropriate operating system support. PAE is provided by Intel Pentium Pro and above CPUs (including all later Pentium-series processors except the 400 MHz bus versions of the Pentium M), as well as by some compatible processors such as the Athlon and later models from AMD.

The x86 processor hardware is augmented with additional address lines used to select the additional memory, so physical address size is increased from 32 bits to 36 bits. This increases maximum physical memory size from 4 GiB to 64 GiB. The 32-bit size of virtual address is not changed, so regular application software continues to use instructions with 32-bit addresses and (in a flat memory model) is limited to 4 gigabytes (GB). The operating system uses page tables to map this 4 GiB address space onto the 64 GiB of total memory, and the map is usually different for each process. In this way the extra memory is useful even though no single regular application can access it all simultaneously.

For application software which needs access to more than 4 GiB of memory, some special mechanism may be provided by the operating system in addition to the regular PAE support. On Microsoft Windows this mechanism is called Address Windowing Extensions (AWE), while on Unix-like systems a variety of techniques are used, such as using mmap() to map regions of a file into and out of the address space as needed.
As for performance hit, you are couldn't be more wrong; it improves performance by allowing you to actually use your memory.

For that matter:

Quote:
Windows XP SP2 and later, by default, on processors with the no-execute (NX) or execute-disable (XD) feature, runs in PAE mode in order to allow NX. The NX (or XD) bit resides in bit 63 of the page table entry and, without PAE, page table entries only have 32 bits; therefore PAE mode is required if the NX feature is to be exploited.
Edit: source is Wiki
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post #16 of 19
Quote:
99.99% of people don't know how to enable PAE to start with; 99% of computer users aren't in the pursuit of performance... apparently, you are among them.
Shees. You clearly have no idea what you're talking about. I do know how to enable PAE if necessary, and I also happen to be "in the pursuit for performance".

Quote:
As for performance hit, you are couldn't be more wrong; it improves performance by allowing you to actually use your memory.
IT ONLY IMPROVES PERFORMANCE WHEN ALL THAT EXTRA MEMORY IS ACTUALLY USED, under other circumstances performance IS decreased because the OS has to keep switching pages and whatnot and memory access times are generally longer, so apps that don't effectively utilize all the RAM will suffer.

Also,
Quote:
Windows XP SP2 and later, by default, on processors with the no-execute (NX) or execute-disable (XD) feature, runs in PAE mode in order to allow NX. The NX (or XD) bit resides in bit 63 of the page table entry and, without PAE, page table entries only have 32 bits; therefore PAE mode is required if the NX feature is to be exploited. However, desktop versions of Windows (Windows XP, Windows Vista) limit physical address space to 4 GiB for driver compatibility reasons.
So, yes, PAE is enabled b/c of NX/DX, but it has absolutely no effect on available memory, the features that allow addressing the extra RAM won't simply be used. Hence, enabling/disabling PAE here has no effect on the accessible memory whatsoever. You're nothing short of a moron for even suggesting it in the first place. And as for you saying that I'm completely wrong with my comment regarding drivers, read the above quote again - it says that the address space is limited to 4GB for DRIVER COMPATIBILITY REASONS. Oh and the source is wiki.
post #17 of 19
Quote:
Originally Posted by bomfunk View Post
Shees. You clearly have no idea what you're talking about. I do know how to enable PAE if necessary, and I also happen to be "in the pursuit for performance".

IT ONLY IMPROVES PERFORMANCE WHEN ALL THAT EXTRA MEMORY IS ACTUALLY USED, under other circumstances performance IS decreased because the OS has to keep switching pages and whatnot and memory access times are generally longer, so apps that don't effectively utilize all the RAM will suffer.
Don't use apps that don't effectively use RAM; as for the page file, it's not that hard to manually override it.. same for memory addressing, which can be tweaked using some Stardock software
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post #18 of 19
Quote:
Don't use apps that don't effectively use RAM;
Which means all pograms except for those that happen to need the extra RAM. By "effective" I meant "capable of taking advantage of the increased memory capacity".

Quote:
as for the page file, it's not that hard to manually override it..
I wasn't talking about the page file. When you use PAE to actually use memory beyond 32 bits, you still have only 32-bit virtual address; PAE allows extra RAM in "lots" of 4GB and usually these "lots" are unique to each process, and wherever you need to access a memory location not contained within the currently active "lot" you need to "activate" the "lot" in which the desired data resides, ans switching between these lots decreases overall memory performance.
post #19 of 19
Quote:
Originally Posted by bomfunk View Post
Which means all pograms except for those that happen to need the extra RAM. By "effective" I meant "capable of taking advantage of the increased memory capacity".

I wasn't talking about the page file. When you use PAE to actually use memory beyond 32 bits, you still have only 32-bit virtual address; PAE allows extra RAM in "lots" of 4GB and usually these "lots" are unique to each process, and wherever you need to access a memory location not contained within the currently active "lot" you need to "activate" the "lot" in which the desired data resides, ans switching between these lots decreases overall memory performance.

Third time I've heard that... verified as true...

you also need to change your sig to "quantum fireball (not on fire.... yet)"

Edit: cant find the picture of the Q fireball actually on fire....
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