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Why do PMDG quote 8GB+ of RAM when P3D is 32 bit?

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I guess to leave room for Windows and its different necessary processes

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Exactly. You need room to run your "other stuff". Using ORBX NCA and the default C172 and with my "other stuff" running I'm using 6.6GB. If you have a lot of "other stuff" running even 8GB will get you an OOM.

 

Doug

Intel 10700K @ 5.1Ghz, Asus Hero Maximus motherboard, Noctua NH-U12A cooler, Corsair Vengeance Pro 32GB 3200 MHz RAM, RTX 2060 Super GPU, Cooler Master HAF 932 Tower, Thermaltake 1000W Toughpower PSU, Windows 10 Professional 64-Bit, 100TB of disk storage. Klaatu barada nickto.

As P3D is 32 bit, meaning it can make use of only 4GB RAM, why do they recommend 8GB+?

FSX is a 32 bit application too. Just like P3D. Absolutely no difference whatsoever. I think you are confusing RAM with VAS (virtual address space) which is limited to 4GB's for all 32 bit applications (FSX, FSX-SE, and P3D). X-Plane is 64 bit so it has almost an unlimited amount of VAS available.

 

The general recommendation for all computer users is to have at least 8GB's of RAM (that's the modules/simms located on your motherboard). VAS is set up by Windows.

 

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Exactly. You need room to run your "other stuff". Using ORBX NCA and the default C172 and with my "other stuff" running I'm using 6.6GB. If you have a lot of "other stuff" running even 8GB will get you an OOM.

 

Doug

No, as long as you haven't disabled the page file, you'll not get an oom. It will just butcher performance as windows will have to heavily use the page swap file to swap memory pages as they are required. 

Matus Celko

No, as long as you haven't disabled the page file, you'll not get an oom. It will just butcher performance as windows will have to heavily use the page swap file to swap memory pages as they are required. 

 

That's true. I guess it just never occurred to me that anyone would intentionally limit the physical RAM and rely on the pagefile knowing that the VAS usage is 4GB (or 3GB with fix on a 32-bit OS).  The ultimate stutter scenario... :rolleyes: .

 

Doug

Intel 10700K @ 5.1Ghz, Asus Hero Maximus motherboard, Noctua NH-U12A cooler, Corsair Vengeance Pro 32GB 3200 MHz RAM, RTX 2060 Super GPU, Cooler Master HAF 932 Tower, Thermaltake 1000W Toughpower PSU, Windows 10 Professional 64-Bit, 100TB of disk storage. Klaatu barada nickto.

How about the additional DLLs some addons use. They should take up their own slice of the internal memory, but do not take part in the VAS usage of fsx - do they?

 

Yes they do. Which is why Microsoft recommends using .exe files rather than .dll.

Gerry Howard

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