Simviation Forums

Hi,

I have edit boot.ini as NickN suggested in Setting up FSX and how to fix it (/3GB/userva=2560) but I still have problem.

It happens when I switch screen for a add-on that are running on the same computer as FSX, I use UltraMon with hot keys.

My question are, what number should I try ?

Par

Need to see your system specs.

It might be due to your GPU(Graphics card or on-board).

By the way, Welcome to SimV.

Need to see your system specs.

It might be due to your GPU(Graphics card or on-board).

Hi,

I have FSX Delux and FSX accelerator install and here are my spec. from Belarc.

Windows XP Home Edition Service Pack 3 (build 2600)

2,20 gigahertz AMD Athlon 64
256 kilobyte primary memory cache
2048 kilobyte secondary memory cache
64-bit ready
Not hyper-threaded

Board: MSI AMETHYST-M 1.0
Bus Clock: 200 megahertz
BIOS: Phoenix Technologies, LTD 3.47 03/03/2006

3328 Megabytes Usable Installed Memory

c: (NTFS on drive 0)      1000,19 GB      785,87 GB free
d: (NTFS on drive 1)      293,59 GB      129,71 GB free
e: (NTFS on drive 6)      160,04 GB      104,51 GB free

NVIDIA GeForce 9600 GT [Display adapter]
Samsung S/M 1100p+ [Monitor] (19,7"vis, s/n H3NRB02269, november 2001)
Standardbildsk

Take a look at this and see if it sheds a little light on the subject.

http://blogs.msdn.com/ptaylor/archive/2 ... space.aspx

Hi ,

Thank's for the link, but it to advance for me (LOL)
Anyway, I found this info in a other forum that I think is a good info how to set userva.

---------------
What's your graphics card memory? I assume your Windows XP is the 32bit version. For a 64bit version the rest of the post is of no use, since has no the Virtual Address practical constraints of the 32 bit's.

As a rule of thumb I've found somewhere a formula to calculate the memory to be reserved for user VAS (Virtual Address Space):

App_VAS (/userva param) = 4096 - 768 - = 3328 -

The reasoning after this formula is as follows:
- At least 768 MB should be reserved for the kernel code and data.
- PCI(express) graphics cards map their memory onto the System VAS
- The rest until 4096MB can be reserved for user mode processes (applications)

That gives us for:
- 256MB Graphics cards -> /userva=3072 (ie, 3GB)
- 512MB -> /userva=2816
- 768MB -> /userva=2560
- 1024MB -> /userva=2304

------------
Hope you find it usefull.

Take Care
Par

That information is correct but the numbers presented are not exact.. they are calculated based on subtracting the video memory amout from the base value specified for address space...

Good to see you having a minute to post again Nick.  Thanks.

best,

...............john

[quote]



That information is correct but the numbers presented are not exact.. they are calculated based on subtracting the video memory amout from the base value specified for address space...

no problem Par

As I said, what was posted is OK to use and it will do the job. The person that posted it does know what they are talking about.

The values are SUBTRACTED and not ADDED to the USERVA edit based on increased PCIe video memory


good luck

[quote]Good to see you having a minute to post again Nick.