Linux 64 bit ram

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How much RAM for 64 bit install?

Post by benali72 » Mon Mar 23, 2015 12:22 am

I support a few old (early dual core) systems that I’ve installed 32-bit Mint 17 with Xfce on, which is suitable because they only have 1 or 2 gig of memory installed. Works great.

Now I have some newer systems, some with 3 g or ram, some with 4 g of ram. All systems run Mint 17 with Xfce.

So where is the dividing line when I should switch to installing 64 bit Mint instead of 32 bit? Should 3g or 4g systems be 64 bit?

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Re: How much RAM for 64 bit install?

Post by jimallyn » Mon Mar 23, 2015 2:26 am

What I have heard is that if you have 4 gigs of RAM or more, you should go with 64 bit. If you have less than 4 gigs of RAM, stick with 32 bit. I don’t have enough experience to say that from my own experience, but that’s what I’ve seen the gurus on here say.

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Re: How much RAM for 64 bit install?

Post by Mark Phelps » Mon Mar 23, 2015 10:43 am

The newer 32-bit Mint versions use PAE — which can access a lot more than 3+ GB of memory. For example, I’m running 12GB of memory, and my Mint 17.1 32-bit sees all of it without problems.

I’ve been told that if you have 4GB or less, you will actually see better runtime performance usin g 32-bit. So, that is likely the dividing line.

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Re: How much RAM for 64 bit install?

Post by Pjotr » Mon Mar 23, 2015 10:55 am

With 64 bit, you get more performance out of your CPU (in some cases up to twice as much). But applications do need more RAM (some 50 %). So it’s all about the available amount of RAM.

Opinions differ widely on this subject, but my advice is: for 2 GB of RAM or less, select 32 bit. For more than 2 GB RAM, select 64 bit.

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Re: How much RAM for 64 bit install?

Post by deleted » Mon Mar 23, 2015 11:07 am

From what I understand, even with PAE, though your OS can access more than 4GB of RAM, your process cannot access more than 4GB of RAM.
http://en.wikipedia.org/wiki/Physical_A . ion#Design
If this is an issue.

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Re: How much RAM for 64 bit install?

Post by xfrank » Mon Mar 23, 2015 12:16 pm

Pjotr wrote: With 64 bit, you get more performance out of your CPU (in some cases up to twice as much). But applications do need more RAM (some 50 %). So it’s all about the available amount of RAM.

Opinions differ widely on this subject, but my advice is: for 2 GB of RAM or less, select 32 bit. For more than 2 GB RAM, select 64 bit.

+1
2GB is enough for 64bit, less than that, not. So: less than 2GB —> 32bit, 2GB to 4GB —> 32 or 64bit (but preferably 64), more than 4GB —> 64bit.

kc1di Level 17
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Re: How much RAM for 64 bit install?

Post by kc1di » Mon Mar 23, 2015 12:34 pm

2gb seems to be the dividing line I have a machine that runs happily on 64bit with Mint and 3 gigs of ram. works great.

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Re: How much RAM for 64 bit install?

Post by benali72 » Mon Mar 23, 2015 1:48 pm

Thanks everyone for the good advice.

I ran a little experiment. I installed both Mint 17.1 xfce 32-bit and Mint 17.1 xfce 64-bit on the same machine.

The machine is a laptop with Intel Core 2 Duo T5800 running at 2.0 ghz. It has 3 gig of real memory. The computer dates from 2009

It definitely seems to run a bit faster with the 64-bit code installed, but at the cost of slightly greater memory use. just as folks here say.

Based on this I will definitely keep the old 1g and 2g machines as 32-bit, and install 64-bit on all 3g and 4g machines.

Re: How much RAM for 64 bit install?

Post by siddhi » Sun Jun 03, 2018 2:14 am

i have 2gb, with new 64 capacity motherboard of intel(9456ct),
can i use mint xfce 18.3 or 19.3 of 64 bit

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Re: How much RAM for 64 bit install?

Post by catweazel » Sun Jun 03, 2018 2:16 am

siddhi wrote: ⤴ Sun Jun 03, 2018 2:14 am i have 2gb, with new 64 capacity motherboard of intel(9456ct),
can i use mint xfce 18.3 or 19.3 of 64 bit

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Re: How much RAM for 64 bit install?

Post by Pierre » Sun Jun 03, 2018 2:44 am

as catweazel said — — Please Don’t Resurrect Old Threads.

so — this one is Now Locked.

Please edit your original post title to include [SOLVED] — when your problem is solved!
and DO LOOK at those Unanswered Topics — — you may be able to answer some!.

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Why do all 64 bit Linux recognize less RAM than 32 bit ones

I’m currently using Linux Mint 32 bit mainly because it generally consumes less RAM and recognizes 100MB more RAM than the 64 bit version. I only have 4GB installed in my computer and I know that all systems don’t use the full memory installed but a little bit less instead. For example, 4GB = 3,8GB in 32 bit systems. The problem is that all 64 bit Linux I tried recognize only 3,7GB. You can say the difference isn’t that big but it is when you don’t have a lot of RAM. Is it the default for 64 bit architecture? Is there something I can do to change that?

Guessing: uefi vs bios boot, or the 64 kernel decompressed is is larger, and your metric doesn’t include the kernel size, only what the kernel itself can address.

3 Answers 3

A 32 bit system can deal with 2^32 bit sizes (4294967296 bytes = 4GB), as opposed to a 64 bit system which can deal with 2^64 bit sizes (18446744073709551616 bytes = a lot more than current hardware can handle). The RAM limit on 64 bit systems is therefore related to hardware limitations, rather than addressing limits.

What you see as less means that a portion of the memory is reserved for something else on the system, most likely as video memory which is done at the BIOS level.

64 bit applications are always slightly bigger in terms of program size and memory usage because variables that are typically stored on 4 bytes like long integers, floating points, and pointers, are all upgraded to 8 bytes to do the same job to support 64 bit addressing. Note that there is otherwise no performance impact.

Источник

Will Ubuntu 64-bit support my PC with of 2 gb ram? [closed]

Want to improve this question? Update the question so it can be answered with facts and citations by editing this post.

While this question may not be the right fit for this website, «opinion-based» seems like a strange rationale. The question can certainly be answered in an objective, verifiable (and well-cited/documented) way.

@MichaelMartin-Smucker: majority votes count here though. Not everyone votes «primarily opinion-based», but the majority did. 😉

@Fabby I sort of assumed as much, but I’m curious about the other reasons. It seems like the kind of question that would have an official answer, and while the question itself is. short, it seems like a fair question. The closest I can find to an answer is this, but that doesn’t seem to address memory requirements for 64-bit.

@ASCIIThenANSI: for the future, please don’t edit closed answers as they then get put back into the reopen queue and create more work for the reviewers. 😉

2 Answers 2

In theory you probably can, but it is not recommended to install 64bit Ubuntu (or other OS) on systems with significantly less than at least 4GB of RAM.

The reason is that a 64bit system stores all data in RAM as chunks of at least 64 bits wide, which is 8 bytes. This also applies if the data chunk would just need e.g. 1 or 8 bits to be saved.

On a 32bit system, all data in memory is split up into clusters of 32 bits width, which is 4 bytes. Therefore, as many applications mostly use data types with not more than 32 bits width, a 64bit system may need up to twice as much RAM as a 32bit system. Because of this, there is the 4GB rule of thumb.

The 64bit version may be slightly faster because of better processor usage, but it may also be slower because it runs oftener and more quickly out of RAM.

Therefore my recommendation:
Install Ubuntu (version 14.04 LTS or 15.04) in 32bit architecture or upgrade your RAM.

In case you still get bad performance, maybe you should even consider choosing a more lightweight desktop environment like XFCE instead of Unity. Xubuntu comes with XFCE desktop by default.

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