Hi ppl. Heres the deal. My oc sometimes passes ibt/linx and sometimes it dont, without changing the settings in bios.... Ive been trying to stabilize it for weeks now, with no success. it doesnt crashes in games, even cpu more demanding ones... ive tried several settings in bios when it doenst passes the stress test... My specs are: q6600 g0 vid 1.3250 asus p5q (bios 1406) 2x2GB teamgroup xtreem dark pc2-8500 This is what ive came up so far: Same settings Always 400*9, ddr's 1066 5-5-5-15 2.2v vcore 1.50625 cpu pll 1.58 sbv 1.10 pci sata 1.50 Settings that changed: Can anyone understand this ?? because i dont... i tried even with higher (1 notch - 1.51xxv) vcore.. but the same thing.. sometimes it passes and other times it don't with the same settings and without changing anything in bios.. after some search i raised the cpu pll to 1.64 and run ibt ant it passed, rebooted run ibt and it passed so i thought finally was stable, but a few days ago i run ibt again and it didn't passed. same settings but cpu pll at 1.64: but sometimes it passes and sometimes it doesn't, the same thing... decided to play with the x8 multi, since i already have 425*8 stable (for sure!). ended up with this settings stable (for sure!): CPU Ratio = 8 FSB Frequency = 447 PCI-E Frequency = 100 FSB Strap to North Bridge = 333 DRAM Frequency = 1074 DRAM Timing Control = Manual - 5-5-5-15 DRAM Static Read Control = Disabled DRAM Read Training = Disabled Memory OC Charger = Enabled AI Clock Twister = Moderate AI Transaction Booster = Manual - Performance 10 CPU Voltage = 1.50625 CPU GTL Voltage Reference = 0.65x CPU PLL Voltage = 1.64 FSB Termination Voltage = 1.46 DRAM voltage = 2.2 Northbridge Voltage = 1.44 Southbridge voltage = 1.20 PCI-E SATA voltage = 1.50 Load Line Calibration = Enabled CPU Spread Spectrum = Disabled PCI-E Spread Spectrum = Disabled CPU Clock Skew = Normal NB Clock Skew = Normal CPU Margin Enhancement = Compatible Mode C1E = Disabled Max Cupid Value Limit = Disabled Intel Virtualization Mode = Disabled CPUTM Function = Disabled Execute Disable Bit = Disabled but 450x8 is really becoming impossible to stabilize... do you guys have any idea, hint or tip to help me? thanks.