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Help! installed Vista 64 bit, SLI not working

by rifeg2 / January 30, 2009 4:04 AM PST

Forgive me, I 'm not sure if this is the correct forum. First here is my setup: AMD 64bit dualcore 6000+, PCI express SLI ready ASUS raidmax board (cant remember model) Nforce setup on board. 6gig memory, SLI ed Geforce 8800GTs 350mb each. (if you need anymore system info just yell).

I recently switched from 32bit window XP pro to Vista Ult 64bit. My drivers for basically everything were dated so I updated all to include geforce 8800 GT sli forceware 181.22 and newest Nforce force ware. I have configured for SLI just as the windows drivers but notice a huge drop in graphics performace. Processor is working much harder with games such as world of warcraft. With XP setup I ran at about 80-100fps at full res settings. Now at half rez settings i run at 60fps sometimes 30. I am convinced my operating system does not see my second graphics card even though the nvidia softeware says SLI is active. I am far from a guru in this sort of thing and am open to all suggestions. second question- do i install games in the win 32 program files or thewin 64 files? (if there is some kind of board switch to go from 32 to 64 bit let me know)

On a side note i stoping running dream scapes in the background as it was pushing my processor at 30%.

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(NT) What PSU are you using ?
by VAPCMD / January 31, 2009 1:47 AM PST
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RE: what PSU
by rifeg2 / January 31, 2009 5:32 AM PST

Thermaltechtough power 750watt PSU with indipendant voltage output

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by rifeg2 / February 1, 2009 10:22 PM PST
In reply to: RE: what PSU

I was incorrect it is 700WAtts. Taking stock in our question, i have shut off the aux lighting in the case. I have also moved my killer lan card above my graphics cards as it was blocking one of the intake fans. I also installed a better fan for cooling the cards and it has brought there operating temperature down considerably. I also have now been able to confirm SLI is working (turned on indicators for SLI, which showed up on the game screen)however i still am suffering from poor perfomance. After further research i am using a ASUS Crosshair board. I am still at a loss why my performance is less that adeqaute for the gear i have.

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Some progress is good....might try the
by VAPCMD / February 2, 2009 8:18 PM PST
In reply to: RE PSU

ASUS user forum for your specific MB.

Does the BIOS support features which turn down the CPU when it's not under load or when the temp rises too high ?

Download and run PC Wizard 2008...then minimize it. The system/CPU temps, speed and load info will remain in the upper right hand corner of the screen for continuous monitoring.


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Re: some progress is good....
by rifeg2 / February 3, 2009 3:08 AM PST

The BIOS does support these features but the chipset never goes beyond 24C due to the themaltech big water cpu cooler. The ambient temp inside the case never exceeds 22C. At least thats what monitoring software says. On A side note, I loaded WINXPpro64bit on an alternate drive and ran it for 12 hours. With WOW running processor never went beyond 58% peak 20% norm ops capacity, no blue screens, no rez issues, 118fps.... I have since pruchased a full copy for myself. Vista will sit in a drawer or on ebay... what waste of $$$. thank you for your ideas and support

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Not the expected outcome but sounds like a positive
by VAPCMD / February 3, 2009 12:20 PM PST


Thought about the Win7 64 beta ? I'm going to give it a spin sometime soon.

Thanks for the feedback


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maybe too late but
by ramarc / February 3, 2009 11:11 PM PST

SLI problems with WoW are not uncommon:

did you try disabling SLI prior to running WoW? It's not that graphically intense and one 8800GTS should handle it nicely.

And, as you've found out, dreamscene is a hog.

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After several driver and software updates for SLI>>>
by rifeg2 / February 19, 2009 4:36 AM PST
In reply to: maybe too late but

Pc is funtioning normally with SLI active. Several driver updates were needed to correct my issues. When I get home I plan to try forcing my refresh rate of my monitor using - this is geared towards 8800 fps issues.
I may or may not have to disable vertical sync for this to actually work. Ill let you know the results.

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NVIDIA graphics cards-FPS fixes
by rifeg2 / February 23, 2009 2:40 AM PST

It worked!!! In Nvidia control panel you have the option to globaly or by porgram disable vert sync (this may cause tearing or distortion in graphics if you have underpowered G-card issues or are at max freq tolerance for refresh rate). I also Ran WOW in full mode not Max windowed mode. My FPS sky rocketed to 185FPS at one point in an instance and stays around 140 everywhere but large cities (down to 50fps) Crisis only made it up to about 55fps at full rez but thats not bad for a 2 yearold amd core 2 64 6000+.

Its my understanding that SLI for lesser coded games such as wow really dont take benifit. same can be said of dual core and sluggishly try to utilize the processor. However after after all of this mind numbing trouble shooting, 8800 g-card users can find a simple answer and an easy place to start to generate better performance. Happy

Almost forgot (make sure you select "single monitor, SLI config and vert sync forced off" all at the same time.

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