Hi all.Well I have been playing around with the FSX Demo and no way is there a FPS gain in SLI Well not on my system.The only other problem I have not found an answer for is. When I click any of the panels to show they are transparent,you can see the background through them,All sliders Maxed out with the barron on the demo defalt runway FPS max 18 with SLI with SLI dissabled 17 FPS,Rig Spec.This systems scores in 3D mark 05 with SLI enabled 12100 Disabled 6800.Asus A8N32 SLI / AMD 64X2-4800 / 2Gig Corsair XMS3200c2PT twinX /2 x XFX 7800gt Extreme ed./ WD Raptor / Akasa 650W powerplus. / Viewsonic VX922.Hopefully the full version will show a gain with SLI.Best regards to all,Rex

What resolution, AA and AF settings?

Hi rich 135.AA set at 8x Res at 1280x1024,AF at 8x The way it is working out for me at the moment I may as well run AA at 18x.and AF at 16x and let one card do the FPS and the other to make it look good.Regards.Rex

I have an SLI rig also. running 7800gtx (91.47 drivers) with AA 16 and Anisio 16. SLI is working great. Even though I am running an fx-57 with 2gig dual channel mem and 10k rpm sata drives, I must turn off the autogen. I have everything maxed except running water at low.2 I must say that IMO FSX is really nice. Ace's have put many in some very nice features. I just hope someone will fix the autogen issue. RegardsBob Gin

Yikes, we have very similar rigs except for the motherboard. I have DFI SLI Mobo and I have 2 Samsung 930BF monitors (I only use one with FS now because aircraft can now be flown from the virtual cockpit exclusively without need to display supplementary windows).I have never found any appreciable increase in frame rates using SLI in either FS9 or the demo. As FS is known to be CPU dependant this is not surprising. However, I have been using SLI16AA and it vastly improves the quality of the display in FS. So SLI doesn't give higher framerates in FS but it can make it look very pretty and improve immersion that way. Might as well use both the graphics cards to some advantage.AMD 64X2 48002 x 7800 GTX2 Gigs corsair

Hi.Thank you both for comeing back to me.So it looks like FSX is the same as FS9 no benefit by useing SLI.I always used to get problems in FS9 with my setup,in the end I gave up.I could get it to work of sorts with coolbits with AA @ 16x but that is not what most of us buy two cards for.Well there is a slight chance that Nvidia may be able to sort something out,It dose make you cross when you have the caperbility to double your frame rate in all up to date games exept FSX.Best regards.Rex

>I just hope someone will fix the autogen issue. >>Regards>Bob GinBob, see Matt's thread "Some Help for Autogen" for a pair of files that reduce the tree variety and roof variety. Between the two of 'em my fps has a good 50% increase, from a solid 20fps to 30+fps on "NORMAL" autogen setting.

I have to dispute your assertion that SLI doubles your frame rates in all modern games. I don't do games much at my age but I have both Oblivion and X3 and neither have their frame rates doubled with SLI. In fact I have never seen a game where the frame rate was doubled but I don't do FPS games.You should try and understand that your graphics sub system is driven by your CPU. If your CPU has a lot of work to do then it will not be able to 'feed' the graphics sub system at a fast rate. So in a sense, the dumber the game the more the improvement with SLI because the CPU has plenty of time to feed the grpahics at a fast rate. In Flightsim CPUs have a lot of work to do and this is in many senses a function of the scope of the simulator. So do not blame Nvidia as they can do nothing about the design and implementation of FS. Beside in FS an FPS of 20 or more is acceptable to most users. Check out the forum topics on FSX current performance for the good oil.;-)

Numerous reviews have also shown that SLI and Crossfire may only produce better FPS at 1600x1200 and higher resolutions compared to one video card at the same resolution. In fact, multi-GPU is really designed for gamers who want to use the higher resolutions. If you seeing less than 30 FPS at 1280x1024, chances are FS can not get the data to the card(s) fast enough to leverage the extra capacity.

Hi you are quite right about the cpu function but wrong about the frame rates in SLI.I use both 3D mark 05 & 06 to check my pc When I have Flashed my bios or updated my video cards.I do not over clock but the check lets me know how my pc is performing.In 3D mark 05 with SLI disabled my mark is around 6000.With SLI enabled this jumps to 11800 not quite double but not far of,These tests by Future Mark realy put your PC to the test,But I will agree that FS9 was the most demanding game I ever played,And FSX will be more.But with a X2-4800 and two gpu,s @450 stock speed I would have liked to have seen some gain in FPS with SLI.but to acheve no gain what so ever Is somewhat dissapointing.I was not blameing Nvidia I said I hope Nvidia may be able to do something. It is all down to Microsoft they would not discuss the SLI problem in FS9 and I bet they will not discuss it in FSX.Best regardsRex.

Hi Rich 135,I have read about what you are sujesting,But to my knowlage this only applys to 7900 cards with 1280x1024 or less,but I am still only a noviceon these matters,RegardsRex.

Hi Yellowjack.I owe you an apology,I am going to blame this on my age.I have just run 03D mark 05 with SLI enabled and disabeled.I can not see a way to send the exel files so will will copy the results for you. SLI BenchmarK= 11531 (Return to prox 43.4FPS) (firefly 35.2FPS) (Canyon 64.3FPS)(CPU test 1 2.6) (CPU test 2 5.4)Dissabled SLI Benchmark = 7375 (Proxy 33.0FPS) (Firefly 21.9FPS) (Canyon 35.6FPS)(CPU test1 2.4) (CPU test2 5.5)That only Gives me a gain of 64% So I am sorry that I said you were wrongBest regards,Rex.

Hi Rex, No need to apologise you are welcome to dispute my views. But all I said was that I disagreed with the OPs claim that SLI doubles the FPS in all other games and that FS (in all its versions) has been CPU bound and will continue to be so I think. I did not say that SLI doesn't improve frame rates and I have no doubt that they will improve FPS to a significant degree in some applications. I too have run the FutureMark benchmarks but they are synthetic benchmarks and are irrelevant to FS performance. I still maintain, from my own experience that the one SLI mode that gave me a noticeable improvement to FS9 visual quality was SLI16AA and I would recommend to any SLI equipped user that they give it a go but I realise that it may not make the same improvement in other rigs. Yellowjack (64 years on the clock and counting)

Yellowjack is correct in his assesment of multi-GPU performance. Runnig SLI or Crossfire does NOT automatically equal huge performance gains and MOST DEFINATELY not in "all modern games" as was stated earlier. IF the game and/or your display settings are limited by the GPU, then yes, you'll see some (possibly major) gains with two cards. If the game is being dragged down by the CPU, you're gonna get little if anything from adding a second video processor. Doesn't matter how much video power you have, if the main processor can't tell 'em to draw the pictures faster, they can't draw 'em.3DMark (and other similar benchmarks) are not "real world" numbers and can be very misleading if not understood in their proper context. A test purely of graphics drawing power is not a true test of a system for gaming. Again, it doesn't matter how quickly the screens can be drawn if the main processor cannot tell the graphics processors to draw them. Anyone who'd like to understand a bit more about what a multi-GPU system can do for you (and what it can't) should read the roundup test which was put together this last summer by several different enthusiast web sites. http://www.penstarsys.com/reviews/video/mu.../pss/index.html

Hi again jack.Thank you for your reply,One month to go and I reach 64, but a friend of mine who is a chief pilot with BA virtual airlines is 75 and still learning. I have struggled with sli & FS9 since Nvidia brought out the 6800 cards for SLI.The only way I could get FS9 to run was as you say with AA set to x16 or x18 with the use of coolbits, but the new control panel it makes things easier.I got good results in the new Demo with AA set to x18 AF x16 I pushed all the sliders to max including autogen and water and got an acceptable result,I am not FPS oriantated I realize that once past 25 to 30fps I will not be able to notice the differance.All the BestRex