For example if you have 12GB like me then you can assign 4GB (or 4072) and I have had no problems at all.
It is worth noting that if you are going to tamper with the allocated max RAM settings for FSX you need to have SP2 installed and the process of upping the allocated RAM for FSX is more stable on a Vista plant form then XP.
Ps. I am still in the testing phase at the moment, however I have noticed a slight improvement when upping the limit to 3GB, however it has become even more stable when upping to 4GB (which is the maximum).
Comorin From United States of America, joined May 2005, 4895 posts, RR: 16
Reply 5, posted (5 years 3 months 1 week 2 days 2 hours ago) and read 23766 times:
On a 32-bit Windows system, you can only address so much memory (4GB); the rest is just not addressable (usable). With 32 bits, and each bit having 2 possible values, you have 2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2 = 4,294,967,296 bits or 4GB of addressable space as the max possible. In other words, Windows cannot 'see' beyond 4GB, regardless of how much memory you have on your computer.
Within the 4GB limit, the space beyond 3GB is of questionable value as the OS (especially graphics) also needs address space outside of FSX. FSX is all about graphics, and using a high end graphics card makes a big difference, but will also eat up some of your address apace.
The only way to make use of more memory is to use a 64-bit operating system and run a 64-bit FSX if there is such a beast. Depending on hardware, you could go up to 128 GB RAM.
My guess is you're running Vista Home Premium 64-bit (since you have 12GB RAM). FSX is a 32-bit program so there isn't any benefit derived from all that RAM.
B727-200 From Australia, joined Nov 1999, 1051 posts, RR: 3
Reply 6, posted (5 years 3 months 1 week 23 hours ago) and read 23720 times:
Quoting Comorin (Reply 5): FSX is all about graphics, and using a high end graphics card makes a big difference,
I hear and read much debate about this - whether a faster CPU or faster GPU will benefit. I am currently running an nvidia 8800 GTS (320mb), but want to try and get my hands on a 9800 series and/or a 200 series GeForce card to do some benchmarking.
With the addressing issue, I have worked out that my system sucks up about 850MB of the address space, which makes me wonder why I bothered with 4GB of RAM
UA772IAD From Australia, joined Jul 2004, 1730 posts, RR: 3
Reply 7, posted (5 years 3 months 1 week 9 hours ago) and read 23701 times:
Quoting B727-200 (Reply 4): I hunted around and found this yesterday, gave it a go and it did improve the stability of the Sim (eg. no more OOM errors).
If I can ask a stupid question - is this now the default on my system or do I need to run this command each time I boot the system up?
If it told you 'operation complete' or 'save successful' or something along those lines, then you should be okay. I don't know if automatic updates disables this. If you get any more OOM errors, then you know.