Ram utilization with 64 bit operating system

Attached is the current configuration of my 8.1 Pro PC & I have a question regarding RAM utilization with 32 bit programs running on this PC.
It has been my understanding that the 32 bit OS (XP Pro), at best, would be able to only utilize 4GB of RAM memory.
I've recently built a PC for the specific task of running an application which is very CPU & output intensive. The application is a Windows based 32 bit application which analyzes and recovers data from NAND chips. Input data comes from a 2.0 USB
feed, is processed and is then written to a 2 disk raid array.
Will the 64 bit operating system enable 32 bit applications to utilize more than 4GB of RAM memory? Any suggestions on how to maximize the processing of 32 bit application on a 64 bit OS would be appreciated.
Operating System
Windows 8.1 Pro 64-bit
CPU
Intel Xeon E3 1275 v2 @ 3.50GHz
35 °C
Ivy Bridge 22nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 657MHz (9-9-9-24)
Motherboard
Supermicro X9SAE (CPU)
37 °C
Graphics
HP w2408 (1920x1200@59Hz)
Intel HD Graphics (Super Micro Computer)
Storage
372GB Western Digital WDC WD4000AAKS-00TMA0 (SATA)
30 °C
465GB Western Digital WDC WD5000HHTZ-04N21V0 (SATA)
28 °C
465GB Western Digital WDC WD5001ABYS-01YNA0 (SATA)
32 °C
465GB Western Digital WDC WD5003ABYX-01WERA1 (SATA)
31 °C
Optical Drives
PLEXTOR DVDR PX-891SAW
TSSTcorp CDDVDW SH-224DB
Audio
High Definition Audio Device

Hi,
As far as I know, 32-bit application running on x64 Windows system had a limit of memory address space. The max usage of RAM is 4GB. I also make a test using testlimit:
According to the screenshot, we can find that, 32-bit testlimit only can leak 4051MB memory, while 64bit testlimit can achieve to 5200 even more larger memory.
For more information about this knowledge, you can refer to contents of chapter 9 in Windows Internal:
http://live.sysinternals.com/WindowsInternals/WindowsInternals-Ch05.pdf
Roger Lu
TechNet Community Support

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[SOLVED]Can I run a 64 bit operating system?

I want to know if I can run a 64 bit operating system on my laptop. the lshw command says I have a 64 bit processor, so does that mean I can run a 64 bit O.S. because almost everything else says 32 bit. So, does all my hardware have to be 64 bit, or is it only the processor that matters? I have looked on the internet and it always seems to relate only to the processor, so I don't know if the other stuff matters. My laptop came with 32 bit vista, if that matters. Sorry if this is a stupid question. Thanks.
Last edited by Tux the penguin (2010-11-23 20:01:40)

Thanks for the quick reply. Sorry. I should have been more clear. By everything else I meant for example:
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