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Not exactly getting the performance I expected out of my 9800 GTX+ SLI

Last response: in Graphics & Displays
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July 9, 2010 7:43:16 PM

Last Christmas, I got a second 9800 GTX+. I ended up getting significantly worse performance on it (like, 40 FPS in Mass Effect to 23), however, and I RMA'd it. Then I got... a 9800 GTX instead, so I RMA'd it again.

Regardless, I just haven't been feeling like the SLI is doing anything. I've been getting some decent gains in places, but I feel like I've been getting a crapload of visual tearing and microstutter as well. It was brought to my attention when I tried out the FFXIV benchmark and found my FPS line jittering a lot:



The sudden jumps are mostly changes in the scene, but the constant up-and-down motions aren't.


The rest of my setup is such:

Win7x64
C2D E8400 Oc'd to 3.7GHz
4 GB DDR2 RAM

What can I do, if anything? Are there any programs I can run to enhance the performance? I already updated to the newest drivers and applied the SLI patch, which technically should have especially helped Borderlands but I'm getting more or less the same performance as one card. Maybe a touch better.

Or, maybe, is it a CPU problem? Is there a bottleneck or something...? Gah!

EDIT: Just for more info, I play at 1920x1200 usually.
a c 125 U Graphics card
July 9, 2010 7:48:03 PM

In general you do get some up and down with FPS like that, although the larger ones at the beggining are interesting as are the 3 large dips.

Screen tearing is generally due to too much FPS. Enabling VSync should fix that.
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a c 272 U Graphics card
July 9, 2010 7:53:02 PM

What happens if you run the CPU at 3ghz?
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a b U Graphics card
July 9, 2010 8:30:41 PM

Did you connect the SLI bridge?
Did you make sure SLI in enabled in the ForceWare drivers?
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a b U Graphics card
July 9, 2010 8:39:42 PM

I went from a single 9800GTX to dual 9800GTX's and if anything my performance went through the roof w/o a hiccup, the only thing that comes to mind is that you have a driver conflict and/or you left a value unchecked just like sabot00 pointed out.
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July 10, 2010 3:48:37 AM

Wow, thanks for the quick replies!
I opened Borderlands a moment ago to test the Vsync, and I noticed it was running silky-smooth for some reason, even when I went out from the cave I saved in to the overworld, which was odd... But as I drove to Fyrestone it worked its way from around 50 to 40 to 30 to probably 24 FPS. I looked down (G15 keyboard <_<) and noticed that my CPU utilization (in Everest) had also worked its way to to 97%. :/  Is that the sign of a bottleneck? Underclocking the CPU back down to 3 GHz brings the utilization up to around 96% normally...

Vsync helped alot in Mass Effect especially, thanks.

Definitely connected the SLI bridge and SLI is definitely on in the drivers. This is just something that's been going through my head since I RMA'd the thing a while ago... However, what can I do to get rid of driver conflicts?
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a b U Graphics card
July 10, 2010 4:14:03 AM

try uninstalling all nvidia drivers then boot into safe mode and run driver sweeper, deleting all nvidia folders and registry entries. then install the drivers again.

if it's still the same then backup your stuff and do a clean install.


if that doesn't fix it then the problem is most likely on the card itself
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a b U Graphics card
July 10, 2010 4:18:07 AM

you can get driver sweeper from here
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a c 153 U Graphics card
July 10, 2010 5:20:32 AM

Erhm, according to another thread the FFXIV benchmark doesnt' correctly use SLI (becuase it is windowed mode), and that is why you are getting poor marks. This is the reason you are doing so bad in the FFXIV bench, and thus it isn't something you should concern yourself with.

http://www.tomshardware.com/forum/290906-33-whats-ffxiv...
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a b U Graphics card
July 10, 2010 5:31:12 AM

Yeah, I would much use Furmark or 3DMark instead, or game-based one's like Crysis and STALKER: CoP.
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July 10, 2010 5:35:33 AM

I'll try that tomorrow and see what happens, then, but thanks for pointing that out.
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a b U Graphics card
July 10, 2010 9:37:19 AM

Sli 9800 gtx is equal to one gtx 260.I donot think it has enough muscle to run latest games in high setting with decent framerate.so just upgrade ur gpu.
said:
Sli 9800 gtx is equal to one gtx 260.I donot think it has enough muscle to run latest games in high setting with decent framerate.so just upgrade ur gpu.


placebo-effect(ed).
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a b U Graphics card
July 10, 2010 2:40:53 PM

Quote:
Sli 9800 gtx is equal to one gtx 260.I donot think it has enough muscle to run latest games in high setting with decent framerate.so just upgrade ur gpu.


You surely must be thinking of something else, a pair of 9800GTX's in SLI will be much faster than a single 260GTX, at least 30%, and up to 50% depending on the game and resolutions. A pair of 9800's should do fine in today's games, just fine.
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a c 272 U Graphics card
July 10, 2010 3:35:45 PM

Quote:
Sli 9800 gtx is equal to one gtx 260.I donot think it has enough muscle to run latest games in high setting with decent framerate.so just upgrade ur gpu.

SLi'd 9800GTX's and SLi'd GTS250's should be about the same performance wise due to them being one and the same, so...











Only equal to a GTX260? I don't think so. :lol: 
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a b U Graphics card
July 10, 2010 3:52:05 PM

Quote:
Those result are impossible.sli gts 250 performing better than gtx 285.becoz 2 gts 250 is cheaperthan one gtx 285.what are the authencity of those benchmark.which website.which part of the game was benchmarked.



I am not positive about the benchmarks, but I can tell you that 250GTX is merely a rebranded 8800GTS (G92)/9800GTX with a little faster memory. That is all. So there is no way a single 250GTX is going to perform much better than a single 9800, or even 8800 for that matter.
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a c 272 U Graphics card
July 10, 2010 3:53:54 PM

Actually it's not impossible it's just a follow on from the what the 8800GT's were able to do when SLi'd. And the website those benchmarks were taken from is Xbit.
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a b U Graphics card
July 10, 2010 4:33:39 PM

Quote:
Those result are impossible.sli gts 250 performing better than gtx 285.becoz 2 gts 250 is cheaperthan one gtx 285.what are the authencity of those benchmark.which website.which part of the game was benchmarked.



Mousmonkey is 100% correct ;) 

Quote:
Just as we had expected, the GeForce GTS 250 SLI configuration showed a very impressive performance in modern 3D games. It was considerably faster even than the GeForce GTX 285 across a number of applications thanks to its advantage in core clock rates as well as in the amount of ALUs (256 against 240) and texture processors (128 against 80).


I used to have dual 250's and it would absolutely destroy any game @ 1680x 1050 or 1920x 1080. The 285 was known for being overpriced hence the reason I never even considered buying one ;) 

Don't ever judge a card by its price-tag, look at the benches and then decide...

http://www.xbitlabs.com/articles/video/display/gf-gts25...
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a b U Graphics card
July 10, 2010 5:52:38 PM

9800GTX+ SLI is just like a 4850X2 (not counting the different scaling), a 4850X2 easily reaches a 5850's performance which is more than any GTX 200 single-GPU based product.
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a c 125 U Graphics card
July 10, 2010 9:29:13 PM

2 cards in SLI/CF can easily be faster than a single more expensive card, price isn't really any way of determining performance. I get better performance on my OCed 5850s than a single 5970 based off benchmarks I've seen, and it was $150 less.
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Anonymous
July 10, 2010 11:42:08 PM

OP, just a quick question, what PSU are you running?
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July 18, 2010 3:59:36 AM

Anonymous said:
OP, just a quick question, what PSU are you running?

I'm running a 600w OCZ StealthXStream.

(yay topic revival)
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a b U Graphics card
July 18, 2010 4:31:01 AM

basing on the specs, that psu should be fine for those 9800s in SLI.

did you try the cleanup using driver sweeper, or a reformat?
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