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unstable sandy bridge PCI-E controller w/ high overclock

post #1 of 6
Thread Starter 
EDIT: seems either my video card or PSU are at fault, not my SB.

I can't seem to get my 4.6GHz sandy stable, I keep getting very minor artifacts in OCCT with my video card on stock speeds. It's not memory or vcore I'm pretty sure of.

what voltage does the on-die PCI-E controller run on? is it VTT? or what?
Edited by s74r1 - 1/18/11 at 3:03pm
Cygni
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Cygni
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post #2 of 6
The PCI-E Controller is on VCCIO if I recall.
The Wtfer
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The Wtfer
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post #3 of 6
Thread Starter 
thanks,

VCCIO: more commonly known at QPI/VTT voltage, this is the VTT voltage. Formally known as Processor Power for I/O it is the voltage for the integrated memory controller as well as the PCI-E controller. While Intel’s Maximum is 1.05 +/- 3% = 1.08v, you can go higher, much higher. I would recommend staying below 1.2v for 24/7 use, but depending on the quality of the IMC on your chip, I have seen 2133 MHz done on as little at 1.1v. I used 1.12v for overclocking my Dominator 1600 MHz to 1866 MHz, and it did it without any problems. Do realize that this voltage contributes heat as well to the whole thermal package.
Cygni
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Cygni
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post #4 of 6
Thread Starter 
Ugh... still artifacting after playing with the QPI/VTT voltage. I'll try upping some other things too...
Cygni
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Cygni
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post #5 of 6
Thread Starter 
I think a combination of VDIMM and VTT fixed it.
Cygni
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Cygni
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post #6 of 6
Thread Starter 
I found the culprit... I was unstable in OCCT even at default clocks and noticed weird fps gains/drops in regards to voltages or clocks.

266 nvidia drivers seem to have a new overcurrent protection that GPU-Z can't disable anymore. I really hate OCP....
Cygni
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Samsung 950 Pro 512GB NVMe M.2 Sandisk X400 1TB mSATA SSD Custom Liquid Cooling Loop Windows 10 Pro 
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Acer Predator X34 34" IPS/G-Sync Curved UltraWi... Logitech G910 Orion Spark Mechanical RGB Gaming... EVGA SuperNOVA 1000 P2 w/ Noctua NF-P14s Redux Lian-Li Armorsuit PC-P50R w/ W-LM2AB-1 side pan... 
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Cygni
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CPUMotherboardGraphicsRAM
Intel Core i7 4790k 4.7GHz delid w/ CLU Asus Maximus VII Formula GeForce GTX 1080 FE w/ fullcover block 32GB (4x8GB) G.Skill TridentX 2400MHz CL10 
Hard DriveHard DriveCoolingOS
Samsung 950 Pro 512GB NVMe M.2 Sandisk X400 1TB mSATA SSD Custom Liquid Cooling Loop Windows 10 Pro 
MonitorKeyboardPowerCase
Acer Predator X34 34" IPS/G-Sync Curved UltraWi... Logitech G910 Orion Spark Mechanical RGB Gaming... EVGA SuperNOVA 1000 P2 w/ Noctua NF-P14s Redux Lian-Li Armorsuit PC-P50R w/ W-LM2AB-1 side pan... 
MouseMouse PadAudioOther
Logitech G900 Chaos Spectrum Logitech G240 Cloth Gaming Pad HDMI->Custom 7.1 Home Theater Sony Dualshock 4 Controller 
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