ok so no seems to have an answer for me. maybe you guys will 
specs.
32 bit XP (sp3)
Q6600 @ 2.4
2gb 800mhz ram
2 x 9800gt in Sli
680i LT Sli
my mobo supports sli i have it enabled in nvidia CP. v sync off and on changes nothing. Iāve tried force frame rendering 1 and 2.
games i have tried it with are Fuel, Nba 2k10, Crysis, Fallout 3.
also my 3dmark 06 was about 8k with and without SLI enabled.
thanks for any input guys.
9800gt sli will make small difference
better u can sell those and try gts250 sli
man i had the exact same issue with my GTS250 SLI on a 750i chipset MB, i never really got a conclusive answer from anyone. Try OC your processor and see if this helps. In my case i did notice a vast difference in 3dMark vantage scores with SLI on/off but no in game difference! Weird indeed. Check in the BIOS if there are any settings regarding SLI and what res are you playing games at coz at low res SLI wont make much of a diff. Well i never could solve my isssue, upgraded to a 5850 
yea man i read through your thread before i posted this. im playing at 1440 
if only i could combine my 2 monitors
think im gonna stomp this card into pieces and throw it in a river. then buy a gtx 260 216core. the 5850 is a tad bit more than im willing to spend atm.
but if anyone has some magic fix lemme know
^^^ yea true..I dont have much more knowledge about sli of gpuās
anyway i am not interested in sli cardsā¦(more money+we need a good psu)
so try to find a used gtx 260 or gtx 280
i have seen some used cards in memberās market
Q6600 @ stock is bottleneck for SLi.. Overclock procy..
At 1440, you can forget about increases from SLI. Anything below 1920x is hopeless for SLI setups, with 2560 providing the biggest improvements. I was running two 9600GTs is SLI, and running a 30" Dell off them, and my framerates nearly doubled across the board, for games that supported it. For those that didnāt, I had to dial back to 1920x or 1680x to make the games playable.
That was two years ago, but I doubt the principles of it have changed. Remember the processing overhead of SLI may mean lower frame rates at lower resolutions than single cardsā¦
^^ ya i have to agree, i think at that res SLI wont have much of an impact and as mentioned the CPU is a bottleneck. OC the CPU to atleast 3Ghz and see what happens
Thatās the stupidest reply Iāve read in six monthsā¦
OP - try using benchmarks for Clear Sky, Resident Evil 5, Street Fighter and the HOC Bench Crysis Benchmark to benchmark.
The first 3 benchmarks are simple download and installs - donāt need the game. For the Crysis HOC, youāll need the game installed with the v 1.2 patch.
After installing everything, shutdown and remove the second card. Use the latest drivers and run these benchmarks logging the fps scores on paper or whatever.
Then put in the other card, reinstally drivers after uninstalling. Then enable SLI, for frame rendering, you can leave it at NVIDIAs default. Then run your benchmarks again and note the scores. In fact if you can take screenies of the benchmark results and post here. There should be a slight difference at leastā¦regardless of the resolution, even a 7-8 fps hike in Clear Sky will tell you everythings okay.
But really, SLI on anything lower than 1920 x 1200 will not scale much. 1440 x 900 is a smaller resolution that will be CPU bound. Try enabling AA and then benchmark - that should stress the cards some more. Also remember for SLI to really scale, you need a really fast CPU. However, the Q6600 is decent enough and you should get some fps difference if you run benchmarks like I suggested. Disregard Muzux2, whoād tell you to buy an AMD 
I suggest buying a bigger monitor and keeping this setup for at least 6 months. Save for the GTX 3xx, one card lol, for SLIing that sans bottlenecks youād need a 6 GHz core i7
^nice info
@honkeytot if fail to work then where u stay so many t.e member will help to for test another sli board 
so if your are at chennai so i can help to for fix recommend problem
nice joke 
ā¦i ve read a nice joke after 6 months
9800gt sli will not make any big difference
thank you everyone for your input but i found out there is another very similar card like mine for sell for 10 dollars less and when i searched the first time it was what i found so i bought it. but they donāt SLI together for some reasonā¦same clocks. i donāt know.
im just gonna get a evga 260 216core for 200. unless there is a better card at 200.
and also my mobo wonāt allow me to overclock. thereās no options for it in my BIOS. need a new mobo as well.
check SLi connector properly
Check GPUz to see if SLi has been enabled properly
get 4GB ram(k sry offtopic but still)
install the newest driversā¦
the performance cant be the sameā¦then SLI isnāt working.
monitor bottleneck
edit : how are you measuring fps ?
QFT.
10 characters.
L.O.L. 
well yea lolz the res is a bit low and same with my ram but i found out there is some āgreenā version of my card for the same price so i bought it and it wonāt SLI with the original. found some other people pissed off lolz.
SLI = PHAIL! Get a better single card always. Few games take full advantage of twin cards + U need high-end mobo + high-end PSU to run a SLI set-up. Realworld difference/jump in games is not worthy at all to invest in two cards!
for some reason..in all reviews..9800GT SLi doesnāt do half as good as 9600GT SLi and GTX series SLiā¦I dunno why but maybe nVidia do not want 2x9800GT to beat a GTX285 so they have not optimized the drivers for the lower end G9x based cardsā¦
on AMDās sideā¦even 2x HD4670 scale like 190% to 220%(yea it does) with CFxā¦and the same trend follows for the HD4770, HD4850, HD4870, HD4890(especially this one) and HD5k series(even though the drivers are only a month old for this one)..
Download Devil May Cry 4 Benchmark and run that with and without SLI enabled. This benchmark has 100% scaling for multi GPU. So if you get x FPS with one card. You should get 2x FPS with SLI enabled. So based on the result of the run
If you do not see any difference in FPS at all, then there is something wrong with the SLI setup itself (meaning SLI is not working at all).
If you see only minor improvement or anything between X and 85% of 2x FPS, you have a bottleneck. The Processor at 2.4 GHz is surely a bottleneck for Multi GPU, so you might want to overclock it to 3 GHz+