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Paul J

Well...I'll be.......I had 3 gigs of RAM, but was NOT USING IT!.....

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I was under the impression that XPSP2 Pro could USE and see up to ***3 Gigs*** of system RAM if you had it installed. I have had 3 gigs installed for months...I was reading around the forum and came across a post that stated:----------------------------For XP:disable hidden files and folder, then on the root C: you will find a file named: boot.ini Open it in notepad and add the following to the end of the OS boot line: /3GB/Userva=2560 multi(0)disk(0)rdisk(0)partition(2)WINNT="Microsoft Windows XP Professsional" /fastdetect /3GB /Userva=2560 :(I now obviously have 33 percent greater resources for my system to utilize, because the O.S. is seeing it. So...I guess that the STOCK SET-UP of XP PRO...does NOT SEE the third gig installed unless you set the new flag in the above instructions. I'll be damned! Here I was thinking all along that I had a 3 gig system...when in fact, my O.S. was only using 2!!!!Jeez.....That third gig of RAM opened up storage resources for textures that overflowed my VID RAM of 256 meg. The performance is now like night and day!Cheers,Mitch

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Mitch - you obviously do far too much flying and don't spend the required amount of time on this site! To properly support FSX one needs to spend at least four evenings per week here, plus any time available at work. EVERYONE knows this!!!;-)

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>Mitch - you obviously do far too much flying and don't spend>the required amount of time on this site! To properly support>FSX one needs to spend at least four evenings per week here,>plus any time available at work. EVERYONE knows this!!!>>;-)>-------------------LOL! I truly thought that XP could/would use 'up to' 3 gigs of RAM, if you had it in your system. I knew about that '4 gig' switch, but thought that only THAT switch was required to force XP Pro to 'see' the fourth. Well...anyway...since using the '3 gig' switch, what a difference to my whole system, let alone flight sim'ming!I would never have seen that post unless I was following a certain thread and it lay buried in it.RECAP...anybody else that has three gigs, you need to enable the boot.ini switch. You'll love the results! For myself, no more snapping in of ground textures, and frankly...I'm wondering if I really even need to upgrade from my P4 until FSXI shows its face. All I wanted was smooth fps performance and clear scenery. I'm now getting all that with my 'dated' lol, system...Life was good. Now, it's even better! :)

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I have four gigs, I can't wait to see what happens! thanks!

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Do you need to do this in Windows XP home edition?I have 2 gigs and bad perfromance with a 512 mb card so...

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>Do you need to do this in Windows XP home edition?>I have 2 gigs and bad perfromance with a 512 mb card so...Uh, no. This is only if you have 3 and or 4 gigs of RAM installed.

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>>Do you need to do this in Windows XP home edition?>>I have 2 gigs and bad perfromance with a 512 mb card so...>>Uh, no. This is only if you have 3 and or 4 gigs of RAM>installed.>>Uh NO! This is for 2 or 3 or 4 gigs of RAM and has NOTHING to do with actual physical memory. If you are going to start a post like this you should do your homework first...There have been SO MANY good informative articles on this subject, just do some searching.Primary RigLiquid CooledIntel C2D E8500 @ 3.8Asus P5N32SLI-Plus2 gigs Corsair XMS PC6400 4 4 4 12 @940Dual OC'd XFX 8800GTX @ 2 gigs24 inch Widescreen LCD 16XAA/16XAFDual 19 inch LCD'sRaid-0+1PCPower and Cooling 1k Quad SLIhttp://home.comcast.net/~psolk/3monitorsa.htmlBackup RigAMD 4000 San Diego @ 2.72 Gigs Kingston Corsair XMS CL2XFX 7900 GTX Raid-0psolk.jpg

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You mean homework like this?http://support.microsoft.com/kb/328882 or this?http://blogs.msdn.com/oldnewthing/archive/.../05/208908.aspxRead the article. There is no reason to delegate virtual address on a system with only 2 gigs of PHYSICAL memory. There is no payout. That was my recommendation after reading my 'homework'...On my 3 gig system, opening up more address space for application use gave me a huge boost on ground texture clarity, than what the Kernel had reserved for itself without the modifier.

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Just so you are aware Mitch, you have now made Windows 3GB aware but FSX is not.There are only 2 ways to get FSX to be aware of and use the extra memory1. Mark the fsx.exe file using software that will allow you to set the >2GB marker2. install Sp2 which has the marker in the fsx.exe fileSince you do not like SP2, you must edit fsx.exe manually so it will use the memory. Download CFF Explorerhttp://www.download.com/CFF-Explorer/3000-...4-10431156.htmlStart CFF ExplorerGo to: File - Open browse and open FSX.exelook for " File Header" and in the right pane you will see "click here". Click it. A box will open. Look for "App can handle >2gb addressest" Check it. Save and close FSX will now use more than 2GB

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Not true... you can get OOM errors with 2 GB of real memory which can be cured by setting the /3 GB switch.Happy you are seeing benefits, but please recognize that this switch is of value, regardless of physical memory on the computer - including a 2 GB system !It is all about giving FSX more virtual address space to play with, or in.:-)

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Well, most people will be totally confused reading this whole thread now. Could someone, who has the definitive answer, please summarize this topic. Thanks,

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Hi Nick!Nick, I only used the above switch recommendation, and POW...my ground textures were no longer snapping, but were just in focus no matter where I panned.I'll add your recommendations on top of that and see what results unfold.Over the past few weeks...well..actually since you published that XPSP2 Tune-Up, things have slowly just been getting better and better,...more fined tuned each day.The effect upon my 'dated' system is massive!FSX has been brought to life, for sure, and so VERY USABLE upon a P4 D0, 3.4GHz Prescott Core with HyperThreading enabled, and 3GB of System RAM.Thanks for all your forum contributions. They are very much appreciated by not only myself, but by all!Mitch

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Does the switch apply to Vista64?My sim computer is running Vista64 with 4GB physical ram. I also have FSX w/ SP1 only installed. SP2 causes constant crashes.Are there any adjustments I need to make?Regards,Richard

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NoA 64 bit OS will use all the memory you can throw at it without the need for switches or cache edits which is why I run XP x64If FSX is SP2, you already have the >2GB marker in the exe file

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It does not surprise me you results are better even without the >2GB marker in FSX. FSX/XP/Vista really need 3GB to do the job right. 2GB is the absolute minimum and with Vista 3-4GB is needed even more

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C'mon guys, what about Windows XP SP3? Anyone have definitive info? I've been told SP3 overcomes the RAM limit without needing further tweaks but I'd prefer something more concrete than hearsay. All I know for sure is that the boot.ini tweak does nothing for my system using XP SP3.Cheers,Noel.

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One more time... this switch has nothing to do with how much physical RAM Windows can use.It simply allows an application that can use it, to use more than 2 GB of virtual address space, taking that address space away from the Operating System.

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You are right, this is confusing...The initial statement, that the /3GB switch allows someone to "use 3 gigs of RAM" is simply incorrect.If you search for the original thread, you'll find that the limitation that is overcome with this switch, is the amount of virtual address space that is made available to an application. This process is INDEPENDENT of the actual amount of physical RAM on the computer.

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XP SP3 doe not do anything to the PAE systemIt requires the same boot.ini editsJust because you are addressing >2GB of memory does not mean FSX will change or run better. That all comes down to the system and how well you have tuned it and FSXMitch has followed my instructions for XP tuning and because of that, when he makes changes he sees results. Most systems are not set up for heavy load graphics applications and FSX is the king of them all. When you set up Windows correctly and properly defrag the hard drive (and I dont mean with the Windows defrag or even other typical payware defrag software) FSX runs much better and changes made which upgrade things further typically display results.

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>You mean homework like this?>>http://support.microsoft.com/kb/328882 >>or this?>>http://blogs.msdn.com/oldnewthing/archive/.../05/208908.aspx>>Read the article. There is no reason to delegate virtual>address on a system with only 2 gigs of PHYSICAL memory. There>is no payout. That was my recommendation after reading my>'homework'...>>On my 3 gig system, opening up more address space for>application use gave me a huge boost on ground texture>clarity, than what the Kernel had reserved for itself without>the modifier.>OK, So where does that homework say you unlocked a 3rd gig of memory? Your OP is completely incorrect confusing and misleading. Especially when forum members have gone to such great lengths to explain this correctly.Primary RigLiquid CooledIntel C2D E8500 @ 3.8Asus P5N32SLI-Plus2 gigs Corsair XMS PC6400 4 4 4 12 @810Dual OC'd XFX 8800GTX @ 2 gigs24 inch Widescreen LCD 16XAA/16XAFDual 19 inch LCD'sRaid-0+1PCPower and Cooling 1k Quad SLIhttp://home.comcast.net/~psolk/3monitorsa.htmlBackup RigAMD 4000 San Diego @ 2.72 Gigs Kingston Corsair XMS CL2XFX 7900 GTX Raid-0psolk.jpg

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I run XP32 and FSX SP1 and I tried the 3 gig switch a while back and also edited the FSX.exe. On my system I got a lot stuttering with it turned on so I had to deleted it.

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... I can't believe this thread... Bill L. - don't you just feel like you've wasted your breath on your long and detailed post three weeks ago? I sure do. This topic has been SO done to death on AVSim and the CoolSky forum. Doesn't anybody read? Or search? :-roll

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Well, I did just as you (Sesquashtoo) say. I edit manually boot.ini file. That also include visit to hardware store and buy that extra 1G of RAM! Windows recognize it... OK, cool. Plus I did just as Nick say - edit FSX.exe ! Then - some testing, of course..... :) And only jump I'm about to see...... is my own, from my balcony !:-bat (I live on 1st floor, don't look for some spectacle!) So,...did I done anything wrong ? Am I miss something ? My PC spec : AMD 2core 5200+, nVidia 8600 GT, 3G:-badteeth of RAM. regards, shnala ____________________________________ edit: I forgot to say : 1) Now I got multiple (3) boot start options (when turn on my PC, now I must sit and wait to choose on of the 3! boot start options !!! How can I eliminate this !?? 2) I notice (maybe it's just me, though!?) that on every switch between full screen & windowed mode my FSX freeze !? That option used to work just fine every time.... x(

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