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 Post subject: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Wed May 07, 2014 5:27 pm 
8086
8086
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Joined: Wed Jan 12, 2005 5:48 pm
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I know that the limit of addressable RAM in 32-bit versions of Windows is 3.5GB, but I noticed that with my 64-bit version of Windows 8.1, my RAM use peaks at 3.5 GB not matter how many programs I throw at it (I have a core i5 overclocked). My system properties shows that the RAM is there, but when I look at the performance indicators I can never get it to go above 3.5 (22% use) which is coincidentally the SAME limit as 32-bit OS.

So my questions are as follows:

1. Can Windows 8.1 (8/7) 64-bit versions use more than 3.5GB of RAM (like actually use in the real-world, not just recognize)?

2. Is there some tweak that I need to make to make use of the additional RAM that I have installed?

3. Is 3.5GB all that my i5 can address at 100% load? which lead me to...

4. Did I waste my money on 16GB? And, thus, should recommendations for RAM be based on the processor not the OS?

Any insight from people with more knowledge than I please respond.

P.S. I am not asking about the theoretical limits of installed RAM for 32-bit vs 64-bit versions of Windows! I know what those are.


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 Post subject: Re: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Wed May 07, 2014 5:43 pm 
Smithfield
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Joined: Sun Jun 18, 2006 7:37 pm
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1. Yes.
2. No.
3. No.
4. Depends on what you're doing.

I'd try running a diagnostic program like Heavy Load which will fill your RAM with junk data. You can also use a RAM Disk utility to set one up and fill it up with junk data.


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 Post subject: Re: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Wed May 07, 2014 5:54 pm 
8086
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Thanks for the quick reply. I will test it again using HeavyLoad and report back what I find.


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 Post subject: Re: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Wed May 07, 2014 6:12 pm 
8086
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Joined: Wed Jan 12, 2005 5:48 pm
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Ok. HeavyLoad did register memory above 3.5 BUT only after I installed the 64-bit version (the link to the 32-bit maxed at 3.5GB).

Which leads me to the conclusion that in order to make use of more than 3.5GB of RAM you need a 64-bit OS, Processor, AND a 64-bit program. I must have been running 32-bit programs which is why I could never get it above 3.5GB.

Anyway, thanks for the tip of HeavyLoad and I will be sure to install 64 bit programs when I can.


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 Post subject: Re: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Wed May 07, 2014 6:18 pm 
Smithfield
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Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5461
Well...

Most programs you'll find are 32-bit and you should get the 32-bit version anyway for maximum compatibility. There's no real benefit for a program to go 64-bit unless you need the memory space. And how do you know you need it? The program routinely crashes because it thinks it ran out of memory.

EDIT: Actually, the only time you should get a 64-bit version of a program is if it deals with system stuff. For instance, you need the 64-bit version of HWMonitor, otherwise it won't work properly.


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 Post subject: Re: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Thu May 08, 2014 8:01 am 
Thunderbird
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Location: Phoenix, AZ
32-bit OS are physically limited to just over 4Gb. Windows has reasons for reporting lessthan that figure---though 32-bit Vista SP1 onwards lies about it and lists 4Gb.

When Windows was created it was decided (coded) to split the 4Gb limit in half between the OS and 32-bit apps, so in a 4Gb system, Windows takes 2Gb even though it needs less than one, leaving the other 2Gb of space for the app(s).

The 64bit versions of Windows are again coded to some limit (8Tb) but 32-bit apps running on them are still limited to 2Gb (again code rather than a real limit) of space (I do not know if a simulation of the /3G switch could work). Few such apps use anywhere near this much space anyway so not a big deal. I assumed modern Windows could run multiple 32-bit sessions at the same time but maybe it switches instead.

Since so little can take advantage of 64bit space yet you see little need for more than 8Gb of RAM and a RAMdrive coming back into vogue (since the 640k limit DOS days) to make use of more than 8Gb of space (hey, RAM is cheap).

The solution is 64-bit apps. Eventually, the 32-bit code will get dumped but I suspect that would not happen until windows 11 or 12, when experimental 128-bit OS is released. Of course that is assuming it is needed on a iPhone or tablet . . . the only two devices the industry apparently expects us to own.

http://msdn.microsoft.com/en-us/library ... 85%29.aspx


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 Post subject: Re: Windows 8.1 3.5 GB RAM Limit Use with 64-bit?
PostPosted: Sun May 11, 2014 12:53 pm 
Million Club - 2 Plus
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You could try reseating the CPU and RAM. 64-bit CPUs have been out for quite a while.


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