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ASUS P8Z77-V Premium SLI w/ 2x GTX660TIs Issue

Last response: in Graphics & Displays
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Hello,

I have a ASUS P8Z77-V Premium motherboard and 2x GTX660TIs running off a 750W power supply. When I connect one graphics card, everything works fine. When I connect the second one, the computer behaves slowly and crashes/freezes with no discernible cause -- regardless of whether SLI is enabled or SLI settings or whether the SLI connector is connected. I have confirmed both are receiving power by plugging a separate monitor into each one. I have tried swapping the graphics cards and they both appear to be working.

Does anyone have any thoughts or information that can help? Is this a valid configuration? Furthermore, should I try contacting Nvidia, EVGA, or ASUS directly?

Thanks
Jordan

More about : asus p8z77 premium sli gtx660tis issue

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Graphics card Master

Okay so let me ask a few questions here and maybe we can get this more narrowed down for you if we could please.

1. What power supply do you currently have.
A. I understand you have ample power however for reference sake it will be nice to know the quality of the unit.
2. You have one card that is from EVGA and one that is from ASUS correct?
A. The one company you can rule out to talk to would be NVIDIA.

1. Corsair AX750 (CMPSU-750AX)
2. Nope, the motherboard is ASUS and I have two of the exact cards. When I ordered them I literally selected "2" in the quantity field. They are both EVGA.
Graphics card Master

Oh okay I got it now so your board is ASUS and that is why you included them gotcha. Also you have a very high quality power supply I have the AX850. Do you get the weird errors as you enable SLi?
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No errors or error messages. Just general system instability. The system will freeze/crash if I start a game after about 5 minutes, and it will run very slowly. Additionally, the computer seems very sluggish even when not running a game when both GPUs are installed.

PS: I do have VIRTU MVP installed, but I disabled it.
Graphics card Master

I would uninstall it completely to be honest VIRTU MVP whether it is disabled or not I've heard it isn't very good. I have the ability to use VIRTU on my Z68 but I don't. Seems very odd that you would be experiencing slow down when you start to play a game.

What does your system look like

CPU:
MEMORY:
VIDEO CARD: 2x 660Ti's
PSU: CORSAIR AX750
MOTHERBOARD: ASUS P8Z77-V Premium

Well, it's slow all around. But seems to crash if I start anything graphically intensive.

CPU: Intel Core i7 3770K @ 3.50GHz Ivy Bridge 22nm Technology
MEMORY: 16gb
Patriot Viper 3 Extreme Performance DDR3 Dual-Channel 1600MhZ (4x4gb sticks)
VIDEO CARD: 2x EVGA Nvidia Geforce 660Ti's
PSU: CORSAIR AX750
MOTHERBOARD: ASUS P8Z77-V Premium
Graphics card Master

jn2guru said:
No errors or error messages. Just general system instability. The system will freeze/crash if I start a game after about 5 minutes, and it will run very slowly. Additionally, the computer seems very sluggish even when not running a game when both GPUs are installed.

PS: I do have VIRTU MVP installed, but I disabled it.


bigshootr8 said:
Well he did say that he doesn't have VIRTU MVP installed so I would say he is safe there quite possibly a bad bridge yea I just don't know. Just very weird behavior.


Graphics card Master

oh fair enough you got me mouse I thought I had told him earlier to uninstall it.
Quote:
I would uninstall it completely to be honest VIRTU MVP whether it is disabled or not I've heard it isn't very good. I have the ability to use VIRTU on my Z68 but I don't. Seems very odd that you would be experiencing slow down when you start to play a game.
doesn't mean he has though true enough.

Best solution

Graphics card Master

mak1e sure the mb reading both cards at 8x speed using gpu-z to read them. the other card should be in the white pci slot. also try switch the pci video bus speed from 3.0 mode to 2.0 mode and see if it the multiplex chip on the mb that having an issue.

Uninstalled VirtuLogic, no effect.

smorizio said:
mak1e sure the mb reading both cards at 8x speed using gpu-z to read them. the other card should be in the white pci slot. also try switch the pci video bus speed from 3.0 mode to 2.0 mode and see if it the multiplex chip on the mb that having an issue.


I set PCI Bus speed from 3.0 to 2.0, and all issues have seem to be resolved. Seeing as my motherboard is supposed to support PCI Express 3.0, I should bring this up with Asus, correct?

More info:

GPU-Z:
1:http://i.imgur.com/jdFUV.gif
2: http://i.imgur.com/kcYHB.gif
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