Shortly, I plan to buy an nVidia 7900GTX card and swap out my ATI Radeon X850 XT PE so I can instal MATROX Triplehead2go with (probably) 3x19" LCDs. At present, my XPS Gen 4 runs FS9 extremely well and the ATI card drives a DELL 2405FP and another 1905FP flawlessly for a total of 3.6 million pixels.Should I add another GB of RAM to my system when I change the video card to the 7900?Appreciate advice, thanks!JS

yeah, I would... I think at this day and age 2gigs is the sweet spot. I added another 2 gigs to my already 2 gig rig and at 4 gigs i never see my memory meter go above about 33%. So if you halved it to 2 gigs i guess you would only use 66% of it. I'm betting you are using all of the 1 gig you have now. Hopefully someone more technically inclined could give you some more concrete numbers. I'm just describing my case. sounds like a nice set up you got going there.later,joe

Sure 2 GB is the minimum if you are thinking about migrating to FSX and Vista in the future. In these circumstances perhaps 4 GB would be a little better (if you can afford it!). If you're sticking with FS9 and Win XP you won't see much benefit from more than 1 GB of RAM. Cheers,Noel.

Technically I don't think the triple heads setup would require more RAM with everything else being equal. And it doesn't sound like you have any problem running FS9 with your original setup with 1GB ram. So my guess is whatever performance you get with 1GB on triple heads will stay the same with 2GB of ram.1GB vs. 2GB for FS9 has been discussed extensively in the past in various threads. I think the conclusion is it won't hurt. But if running services and programs are kept to a minimum when FS9 is running, most people don't really need another GB of ram.

I am sticking with FS9 and my non-DX-10 rig until late 2007. I wanna see how FSX goes for others and wait for Vista to be released and then be patched to fix 15,000 bugs!I can't believe how much RAM some folks are seriously installing to get ready for FSX. 4 GB? It's....unbelievable !Thanks to all for their replies.JS

I have 4 GB of RAM but it's for more for Solidworks. My workstation at the office 4 GB is a minimum for large complex assemblies. I cant wait for Vista to cram 8 GB into it. It's overkill at home but FS gets to eat the leftovers ;-)

All these answers and no one asked the original poster the most important questions?What add-ons do you use?What planes are you flying?What sceneries do you use?If the answers are things like PMDG and LVL-D or PSS with ASV6, FS2Crew, FSPassengers and add-on sceneries then yes, you want two gigs. If you are sticking with default FS then no need.It is really a very simple answer, can't believe no one asked you what software you were running...-Paul

I run everything:PMDG NG and 744CoolSky MD-80Level D767Every add-on by Milton Shupe and David Maltby.Eight modules of GoFlight hardware including the MCP.CH Throttle, Rudder Pedals, and YokeEvery USB port into the PC is occupied with hardware add-ons.PC is NOT online and never will be. No AV, no security utilities. I use my other PC to check for that stuff and then load it onto the XPS.JS

Very limited add-on sceneires:FLY Tampa (4 airports)A few freeware sceneries for EDDF and such like.No other scenery stuffJS

Oh, yeah, and UT but set to 25-30% because anything higher is a killer at large airports and I also risk getting rear-ended (!)JS

Off topic but you've gotta get the flightscenery stuff. :)I do the same as you do. Go extensive on planes and keep sceneries to a minimum. Cheers!

Yep, do it. PMDG 744 alone is reason enough to do it ;)Depending on what you have, you might want to consider just getting a matched 2 gig pair. Personally, I am a Corsair XMS man myself...-PPrimary RigLiquid CooledAMD FX-57 @ 3 gigsAsus A8NSLI-Premium2 gigs Corsair XMS PC3500LL 2 3 2 6 1TXFX 7900 GTX 690/1750XFX 7800 GTX 515/135024 inch Widescreen LCDDual 19 inch LCD'sRaid-0+1PCPower and Cooling 1khttp://home.comcast.net/~psolk/3monitorsa.htmlBackup RigAMD 4000 San Diego @ 2.72 Gigs Kingston Corsair XMS CL2XFX 7800 GTX 515/1350 Raid-0http://forums.avsim.net/user_files/157272.jpg

Do 4 gigs if you can.

My existing RAM is 2x512MB. Would it make any diff to get one extra stick of 1GB or must I get another round of 2x512?JS

Let's not go overboard. FS9, even with every addon under the sun, will happily wallow in 1G RAM with minor hard drive caching. FSX seems to want more based on my experience with the FSX beta, but not that much more. 2G should do you plenty for both FSX versions.Gary