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Where is IOH voltage on my board?? - Page 3

post #21 of 35
Quote:
Originally Posted by stilllogicz;15161077 
The customer rep said since each card works without errors by themselves that most likely the SLI bridge is bad and that is a common problem encountered with SLI users. So he said to try a new bridge and then if it doesn't work, request an RMA.

Ah, that's one variable I forgot. It happened to me as well; tried two SLI bridges before my setup worked.
    
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post #22 of 35
I see that you have a 1000w psu. Your cards have 2 6pin's right?. You should have more than 4 6pin's on that 1000w psu. Have you tried using a different set of connectors from your psu? Maybe you have a bad rail or your overloading one rail. Just something else to try. If your sli bridge was working fine and you didn't mess with it, I wouldn't think that was it really. I've never had one go bad except for the one I painted:D
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post #23 of 35
Seeing that you psu is a modular design. I would try using a different cable for the pci-e connector. You have 6 spots on the psu for your cables. I had a Enermax 1050w that was similar and one of my plugs on the psu had a short in the connector. As soon as I moved it to a different spot, I was good. Your psu is a single rail design also, so you could have a short in a plug or a short has developed from a cable being pulled or in a certain spot for a while. Just some things to try before going through RMA.
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post #24 of 35
Thread Starter 
thanks for advice guys. 1 thing to note was my SLI was working great before I decided to overclock my CPU. Kinda leads me to think it's a voltage thing somewhere although my CPU is rock solid, 20 tests of IBT at maximum and 24 hours of p95 blend. I'm currently running occt gpu ram and stability tests on each card seperately.

I've read up on the PCH voltage and apparently it does not deal with the graphics cards:

"Platform Controller Hub voltage. The PCH voltage feeds the chipset on the motherboard, which is responsible for talking with all of the peripherals on your computer, such as USB devices, hard drives, and any add-on cards–except for the video cards–which now talk directly to the PCI-Express controller integrated into the CPU."

So does that mean vcore is the voltage that controls the IOH for the gfx cards?

UPDATING with some other relevant info that might help us figure this out:

Intel Processors – Chipset Options

Chipset-related options include all voltages that are not the ones described in the previous page. They include:

North Bridge voltage: This is the voltage that feeds the North Bridge chip from the motherboard chipset. It is important to note that Intel calls the North Bridge chip the MCH (Memory Controller Hub, on motherboards targeted to CPUs without an embedded memory controller), IOH (I/O Hub, on motherboards targeted to CPUs that have an embedded memory controller using a two-chip chipset solution) or PCH (Platform Contoller Hub, on motherboards targeted to CPUs that have an embedded memory controller using a single-chip chipset solution), so the name of this option can vary. PCH chipsets have two separate voltages, VccVcore (usually referred on the motherboard setup as “PCH 1.05 V” or “PCH Voltage,” which is the chip’s main voltage) and VccVRM (usually referred on the motherboard setup as “PCH 1.8 V” or “PCH PLL Voltage,” which feeds the clock multipliers inside the chip).

South Bridge voltage: This is the voltage that feeds the South Bridge chip from the motherboard chipset. It is important to note that Intel calls the South Bridge chip the ICH (I/O Controller Hub). Therefore, the name of the option can vary – “SB Voltage” and “ICH Voltage” are common names.

PCI Express voltage: If you want to change the PCI Express voltage, you will have to study and see where each PCI Express slot or lane is connected on your system. For example, some Intel CPUs can control one x16 or two x8 PCI Express connections for video cards, with the lower-speed slots being controlled by the chipset (PCH). On some other configurations, the PCI Express x16 slots are provided by the North Bridge chip (MCH or IOH) while the lower-speed PCI Express slots are controlled by the South Bridge chip (ICH). The voltage used by PCI Express lanes is usually hard-wired to the chip’s voltage rail and, therefore, are automatically changed when you change the CPU, the North Bridge (PCH/MCH), or the South Bridge voltage, depending on where the lanes are connected to. Some chipsets (most notably Intel X58) have a separate voltage supply for the PCI Express lanes, and on motherboards based on such chipsets, you may find separate configurations for adjusting the PCI Express voltage. For example, “IOHPCIE Voltage” would adjust the voltage from PCI Express lanes controlled by the motherboard North Bridge chip (IOH), while “ICHPCIE Voltage” would adjust the voltage from the PCI Express lanes controlled by the motherboard South Bridge chip (ICH).

PCI Express clock voltage: Some motherboards allow you to increase the voltage from the clock signal used by the PCI Express lanes. This option is called “PCI-E Clock Driving Control” or “PCI Express Amplitude Control.”

Also to note, changing the PCH voltage shows up in AIDA64 as southbridge voltage.

Updating once more: PCIE Frequency? thoughts? Right now it is @ 100.
Edited by stilllogicz - 10/3/11 at 10:34am
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post #25 of 35
Thread Starter 
So I've run the occt gpu test and ram test on both cards seperately and they both passed. I bought a new SLI bridge and my games still lock up. I'm really just thinking it's time for an RMA
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post #26 of 35
Thread Starter 
Could it be that I have a defective motherboard? When I revert my bios to default, none of these problems happen.
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post #27 of 35
Quote:
Originally Posted by stilllogicz;15161888 
Also to note, changing the PCH voltage shows up in AIDA64 as southbridge voltage.
.

Hmm. Isn't that what would transfer the information to your 2nd gpu?
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post #28 of 35
Thread Starter 
quite possibly hambone, i'm utterly lost on the subject
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post #29 of 35
LGA-1156 and 1155 have an integrated PCI-E controller and therefore have no IOH.

They do have a PCH, but this is nothing more than a glorified southbridge, and this has nothing to do with your GPUs either. Your graphics cards should not be connected to the chipset in any way.

It's likely the problems you are experiencing aren't caused by the GPUs, but instability elsewhere.
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post #30 of 35
Thread Starter 
could very well be blameless, considering when I got back to default in my bios the problems stop. I put in an RMA for my motherboard just in case because everything tests stable in IBT and Prime 95 blend. I honestly don't know what else to do.
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