Well, I found this other forum where they discussed the same thing and it seems to work even without the flashing of the 9800 to 250..... so it will work I guess
http://www.hardwarecanucks.com/forum/hardwarecanucks-f-h-team/16599-mix-gts-250-9800gtx-folding.html
That's the link to the article but the next article from there on is actually not found
so will still look around and let you know, but I guess, Logically and practically a lot of people have done this, and they seem to have had no problems with it......
And heres a quote from Mansmind of the OC forums
"9800 GTX+/GTS 250 SLI OC
Before anyone asks, I didn't get either of these cards with the idea in mind of either overclocking them, or benchmarking with them. I bought the 9800 to put in a new system because it's a decent card for not a lot of $. I just happened to have a GTS 250 lying around at the office, so thought I would bring it home and play.
I guess you could say I've got the bug, I built my first system from scratch a month ago, and started playing with overclocking the system about 3 weeks ago, so I have a lot to learn still.
I've read several times that you should really have 2 of the same GPUs for SLI, although that seems to be dated news. Either way, I put them together in SLI configuration and they seem to work fine at stock speeds. It's not a huge boost in performance... 15% at worst and 25% at best in FPS.
The fun began when I started trying to overclock the cards. I'm using Precision Tune for the adjustments and Furmark for tuning (without links either between the GPUs or the core/shader clocks). The best SLI overclock I've got that's "stable" is:
9800 - 845/2025/1250 stock 738/1836/1100
250 GTS - 740/1750/1020 stock 675/1500/900
While it may be stable in just about everything, it gives me fits in 3DMark Vantage. I start seeing artifacts, primarily in the water...actually only in the water (1st test scene). To get rid of it I have to back off the core clock on the 9800 to around 830...that's the only change. Even then I still see them from time to time but it's not consistent.
While benchmarking, I had one heck of a time even getting some of them to run. 3DMark06 and AquaMark3 (still can't get this one) especially. Yes I've applied the patches and deleted dlls, etc. I did get 3dm06 resolved.
I'm not sure how, or even if.. running in SLI affects the overclocking ability of cards, but in this case it certainly does. Just for kicks I disabled SLI and ran on the 9800 GTX+ alone.
I was able to get the core clock up to 855 and remain stable (860 locked). I haven't pushed the shader yet, and I almost know I can take the memory up above 1250 easily enough...probably 1300 or so (I did this even in SLI mode).
Disabling SLI made a significant difference in benchmark rankings in comparison with like systems. I suppose that is expected since when using SLI it lists me as 2x 9800 GTX+ which I'm certainly not.
Excuse my wordiness, but I wanted to get the process I've gone through out there in the hope that one of you with far more experience than I have can answer some questions:
1. Seems to be a bad idea to mate these two cards if you're going to try to push them, correct? That being said, running at stock speeds does give you some improvement.
2. Suppose I get rid of the GTS 250 and buy a much better GTX 480? Would I be able to run that in SLI with the 9800 GTX+ or would I run into the same issues? If so, would I be better to just get another 9800 GTX+?
3. Anyone know of any OC'ing tricks I could try with the 2 cards I already have that may give me more stability?
4. I have a feeling if I could get a little more voltage to the 9800 I could take it up some more. According to GPUz it's running at 1.20v max. Any way of changing this short of flashing the BIOS?
Before I forget, here's my system info (I need to put this in my sig):
i7-930 @4.2 on air
12GB Corsair DDR3 1600
Asus P6TD Deluxe
Corsair HX 1000 PSU
6 WD Caviar Black 1TB HD's 2 in Raid 0, 4 in Raid 10
Coolermaster HAF 932 case
If you have any thoughts, comments, or advice I would appreciate hearing it.
Thanks"
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