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Rosewill 750w Fortress psu inadequate for SLI? No SLI configuration with nvidia GTX 660Ti cards x 2 and msi Z77a-GD80 mobo

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September 5, 2013 11:24:31 AM

I have spoken with msi and nvidia techs many times and tried every suggestion they have. Could my Rosewill 750w Fortress PSU be inadequate? An nvidia tech informed me there is a bigger power draw on the initial start/boot-up, followed by drastically reduced power needs/consumption. Thanks in advance for any suggestions/insights.

My PC: HAF 932 case, Rosewill 750w Fortress PSU, i7 3770 quad core intel CPU with Turbo Boost, msi Z77A-GD80 mobo, 32 GB Crucial RAM, two genuine nvidia 660 Ti 2 GB RAM video cards
a b Î Nvidia
September 5, 2013 12:00:05 PM

There should be absolutely nothing wrong with that PSU for SLI. I have used many less expensive Rosewills in budget builds and all of them are still going strong. And that Rosewill is one of the better ones. It has a strong 52.5A (+12V) rail. More than enough for both cards.
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September 7, 2013 11:30:19 AM

clutchc said:
There should be absolutely nothing wrong with that PSU for SLI. I have used many less expensive Rosewills in budget builds and all of them are still going strong. And that Rosewill is one of the better ones. It has a strong 52.5A (+12V) rail. More than enough for both cards.

Thank you for your reply, Clutchc. Unfortunately, that leaves me clueless as to why my Z77A-GD80 mobo with two genuine NVIDIA 660Ti graphics cards, an intel i7-3770 quad processor and 32GB Crucial ballistics RAM has no option for turning on SLI mode. Everything inside the HAF 932 box checks out ok. Both graphics cards have 2 GB video RAM, I've updated the Bios to v1.6, updated the ME from 8.xx to 9.xx, reset the CMOS, checked out each video card, and found no reason I cannot enable SLI in the NVIDIA control panel. Is there anything else I might be able to check out to enable SLI mode that you could suggest? After several calls to msi, tech support, the tech suggested I send the mobo back for msi to check it out. Other than being unable to utilize SLI mode, everything else seems A-OK.

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a b Î Nvidia
September 7, 2013 11:58:45 AM

I have had that same anomaly occur a few times in the past. It is usually fixed by uninstalling everything Nvidia through Control panel and then re-booting. After Windows loads its generic driver, re-boot again to safe mode and run Driver Sweeper.
http://www.techspot.com/downloads/4266-driver-sweeper.h...

Have it remove any remnants of any graphic drivers it finds. Then re-boot and install the latest Nvidia driver for your cards/OS. After the required re-boot, wait until it gives the pop-up allowing you to enable SLI. If the pop-up doesn't show up, go to the NCP and do it yourself.
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October 13, 2013 11:43:33 AM


clutchc said:
I have had that same anomaly occur a few times in the past. It is usually fixed by uninstalling everything Nvidia through Control panel and then re-booting. After Windows loads its generic driver, re-boot again to safe mode and run Driver Sweeper.
http://www.techspot.com/downloads/4266-driver-sweeper.h...

Have it remove any remnants of any graphic drivers it finds. Then re-boot and install the latest Nvidia driver for your cards/OS. After the required re-boot, wait until it gives the pop-up allowing you to enable SLI. If the pop-up doesn't show up, go to the NCP and do it yourself.


Thank you for all your suggestions, clutchc. I tried your suggestions for deleting/reinstalling all nvidia drivers after running Driver Sweeper and still had no SLI configuration available. I contacted msi and an msi tech asked me if I tested each graphics card separately. I said "yes" and further replied I tested each card separately with the msi Z77A-GD80 motherboard. The msi tech informed me the only way to truly test each video card would be installing them one at a time into another pc. I couldn't understand why I needed a second pc to test each 660Ti video card. If the cards work ok installing/testing one-at-a-time, what difference does it make?

I also contacted Nvidia tech support. Nvidia's tech support was really awesome. Nvidia support called me and suggested I try a clean install of a slightly older 660Ti driver which (unfortunately) did not solve my SLI problem. Nvidia requested additional info about my PC and I am waiting for another possible solution.
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a b Î Nvidia
October 13, 2013 7:55:59 PM

OK. Let's go over this again...
1) Are both cards identical? What MSI model are they?
2) Is the SLI bridge installed securely? (although, SLI should work independently of the bridge) Try it w/o the bridge.
3) Are the 2 cards in slots PCI E2 and PCI E5?
4) I understand you tested each card individually to be sure they each worked. Have you tried each card in all 3 PCIe x16 slots individually to be sure the slots work?

At this point, I would have to assume the MB is defective and would be tempted to RMA it back to the retailer or, if too late for the RMA, set up a return/replacement with MSI.
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October 28, 2013 9:17:47 PM

clutchc said:
OK. Let's go over this again...
1) Are both cards identical? What MSI model are they?
2) Is the SLI bridge installed securely? (although, SLI should work independently of the bridge) Try it w/o the bridge.
3) Are the 2 cards in slots PCI E2 and PCI E5?
4) I understand you tested each card individually to be sure they each worked. Have you tried each card in all 3 PCIe x16 slots individually to be sure the slots work?

At this point, I would have to assume the MB is defective and would be tempted to RMA it back to the retailer or, if too late for the RMA, set up a return/replacement with MSI.


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October 28, 2013 9:19:12 PM

Hello clutchc:
I just found/read your latest reply (above) to my question; thank you very much for ALL the info you've posted. Both of the video cards are identical, GeForce 660Ti's genuine nvidia cards purchased at a local Best Buy. The mobo I am using is an msi Z77A-GD80 with only 3 PCI express slots with the video cards on slots 1 & 2 (slot #3 space is cut off by the PSU). I now have a collection of 3 SLI bridges; no difference noted with any of them. What's interesting is with only one 660Ti card installed the nvidia control information displays IRQ 16 and Bus x8 Gen 3 in the nvidia information window. With two GeForce 660Ti's installed, the Bus is x8 for the first card and x4 for the second card; IRQ = 16 with two GeForce 660Ti cards installed. My PC did go into SLI configuration; when I tried to save the SLI set-up, I was prompted to close a few programs running in the background. I was unable to close all of the programs and could not get into SLI again. I called msi and nvidia today. The final verdict pretty much came from nvidia: that something is going on with the motherboard; some sort of incompatibility - and the video card is running at half the speed it is capable of, to protect the motherboard. I will request an RMA from msi for the motherboard. On a recent call to msi support the tech I spoke with said I could return the board, it would be tested and probably nothing would be found wrong. The msi tech told me I would definitely get another board, but it would be refurbished. I felt the msi tech was being very honest with me. My Plan B is to research and purchase a new motherboard; suggestions would be welcome.
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a b Î Nvidia
October 29, 2013 10:16:41 AM

Look on page 1-5 of your MB manual. Since you are using a 3rd gen processor (i5-3xxx), you should be in the 1st 2 slots (E2 and E5), and they should be producing x8, x8 bandwidth. (1) Is this the situation? And (2) are there any cards in any of the other slots?

You may have to temp un fasten the PSU and ease it out of the case a bit to try this next thing... but on the off chance that the 3rd slot has some pins touching causing the MB to think there's a card in it, insert a card temporarily in and out of the slot to see if that resets things. You might even give the 3rd slot a test just for the heck of it.

The other thing that makes me more suspicious that the MB is the problem, is the fact that you say your 2nd card is only at X4 bandwidth while in the 2nd slot. That is not right. It should only be x4 bandwidth in the 3rd slot. The 1st and 2nd slots should default to x8, x8.
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October 29, 2013 12:10:05 PM

clutchc said:
Look on page 1-5 of your MB manual. Since you are using a 3rd gen processor (i5-3xxx), you should be in the 1st 2 slots (E2 and E5), and they should be producing x8, x8 bandwidth. (1) Is this the situation? And (2) are there any cards in any of the other slots?

You may have to temp un fasten the PSU and ease it out of the case a bit to try this next thing... but on the off chance that the 3rd slot has some pins touching causing the MB to think there's a card in it, insert a card temporarily in and out of the slot to see if that resets things. You might even give the 3rd slot a test just for the heck of it.

The other thing that makes me more suspicious that the MB is the problem, is the fact that you say your 2nd card is only at X4 bandwidth while in the 2nd slot. That is not right. It should only be x4 bandwidth in the 3rd slot. The 1st and 2nd slots should default to x8, x8.


Thank you, clutchc, for pointing out the Bus values & configurations in the motherboard manual. I had all 3 PCIe slots filled, tried reversing the video cards - the 660Ti card from slot 2 inserted into slot 1 and the slot 1 card inserted in slot 2. Slot 3 has a Creative Audio soundcard inserted and it works just fine. With nvidia 660Ti cards in slots 1 & 2, the Bus values were x8 and x4. The processor is an i7 3770 with turboboost (no K). When the video cards in slots 1 & 2 are swapped, the Bus values remain x8 for slot 1 and x4 for slot 2. I called msi about this and was informed slots 1 & 2 on my motherboard should both have x8 values. I have enough credit from parts I returned to Newegg to get me half way to purchasing another motherboard. The msi tech I spoke with yesterday suggested I read the motherboard manual for a board I consider purchasing. The msi tech also told me a motherboard used in an SLI configuration should have 4 or 5 PCIe slots.
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a b Î Nvidia
October 29, 2013 12:21:58 PM

You have a sound card in the 3rd PCIe X16 slot? Try removing it. (You may want to uninstall the driver first) There should be nothing in the 3rd PCIe X16 slot in order to have x8, x8 available at slots 1 and 2. With gen 3 CPUs, you will lose some bandwidth in slot 2 if it sees the 3rd slot populated. That may also be your SLI problem. It is thinking it has to SLI the 1st 2 cards with the "card" in slot 3.
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October 29, 2013 1:37:43 PM

clutchc said:
You have a sound card in the 3rd PCIe X16 slot? Try removing it. (You may want to uninstall the driver first) There should be nothing in the 3rd PCIe X16 slot in order to have x8, x8 available at slots 1 and 2. With gen 3 CPUs, you will lose some bandwidth in slot 2 if it sees the 3rd slot populated. That may also be your SLI problem. It is thinking it has to SLI the 1st 2 cards with the "card" in slot 3.


THANK YOU clutchc! I will try uninstalling the Creative driver & sound card and let you know how things turn out.
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November 9, 2013 7:59:06 PM

clutchc, THAT WAS IT!! you were right on - The creative soundcard in the 3rd PCI Express x16 slot prevented the SLI from being enabled! I used the Windows Task Manager to close the "interfering" programs, connect the SLI bridge (would not go into SLI without it) & the SLI was enabled.

Sorry to take so long to reply and thank you once again for all your help - I had major surgery this week, & looked forward to returning home to a machine that was working.
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a b Î Nvidia
November 9, 2013 8:08:38 PM

Glad to hear all is working now. And good luck with the surgery.
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