Guys, need a little bit of help with my overclock. I have the following stuff:
QX9650 watercooled
2x 2GB Gskill DDR2 800
4870 X2
Auzentech DTS Xplosion

Since I've had this CPU, I've been at 4 Ghz, previously on the DFI P35 board. I'm having trouble getting everything perfectly stable on this board. By trouble, I mean: I can pass IntelBurnTest at maximum stress for 20 tests, and it will pass stable. I can do Orthos on all 4 cores Blend and small fft's for hours, and it will be fine. SuperPi stable. 3d Marks stable. However, sometimes doing random things, like repairing Par2 files and installing a game, or playing a game, for instance, USB's will start disconnecting and reconnecting repeatedly, and before I changed my RAM speed, it would even lock up.

At first, I tried 400 x 10, the settings from my last board. It will pass every stability test, but would still lock up sometimes. Then I tried 450 x 9, and the same thing. With both of those settings, I was trying 1:1 ratio on the RAM, keeping it low, around 800 (400) and 900 (450). However, when it locked up, I changed it to the current setting. I have not had a lock up since, making me think RAM was the issue for the lockups. However, I still have other stability issues: when I'm playing a fairly intensive game like Assassins Creed, sometimes after playing it for awhile, the USB's will start disconnecting and reconnecting (usually it's my fan controller that it disconnects and reconnects, not my mouse/keyboard). Also, sometimes it seems the PCI stuff gets messed up - my sound started losing synch., and being way behind what I was seeing on screen. It seemed possible my graphics got choppier too. It never froze up though.

I'm not sure what's going on and would like some help. I experimented once by giving 1.35v to NB & VTT, but after playing Assassins Creed for an hour or so, the NB heat built up to 66 degrees C, and it started locking up. It did not do the USB disconnecting though, or the weird PCI issues. I went down a lot (to 1.25V for NB & VTT) to avoid the heat issue, but have been working up slowly trying to make the USB & PCI issue go away. At my current setting, 1.31V for NB & VTT, it doesn't get much warmer than 55 degrees, but I'm still having the issue.

I'm using BIOS 0802.

PHP Code:
Ai Overclock Tuner: Manual
OC From CPU Level Up: Auto
Ratio CMOS Setting: 9
FSB Frequency: 450
CPU Clock Skew: Normal
NB Clock Skew: Normal
FSB Strap to North Bridge: 333
DRAM Frequency: DDR2-1081MHz

DRAM CLK Skew on Channel A1: Auto
DRAM CLK Skew on Channel A2: Auto
DRAM CLK Skew on Channel B1: Auto
DRAM CLK Skew on Channel B2: Auto
DRAM Timing Control: Manual

1st Information: 

CAS# Latency: 5 DRAM Clocks
DRAM RAS# to CAS# Delay: 5 DRAM Clocks
DRAM RAS# Precharge: 5 DRAM Clocks
DRAM RAS# Activate to Precharge: 15 DRAM Clocks
RAS# to RAS# Delay:  Auto
Row Refresh Recycle Time: Auto
Write Recovery Time: Auto
Read to Precharge Time: Auto

2nd Information:

Read to Write Delay (S/D): Auto
Write to Read Delay (S): Auto
Write to Read Delay (D): Auto
Read to Read Delay (S): Auto
Read to Read Delay (D): Auto
Write to Write Delay (S): Auto
Write to Write Delay (D): Auto







3rd Information:

Write to PRE Delay: Auto
Read to PRE Delay: Auto
PRE to PRE Delay: Auto
All PRE to ACT Delay: Auto
All PRE to REF Delay: Auto
DRAM Static Read Control: Auto
DRAM Read Training: Auto
MEM. OC Charger: Disabled
Ai Clock Twister: Auto
Ai Transaction Booster: Auto


PCIE Frequency: 100

CPU Voltage: 1.525
CPU PLL Voltage: Auto (usually goes to 1.69)
FSB Termination Voltage: 1.31
DRAM Voltage: 2.1
North Bridge Voltage: 1.31
South Bridge 1.5 Voltage: 1.51325
South Bridge 1.1 Voltage: 1.11325

CPU GTL Reference (0): Auto
CPU GTL Reference (1): Auto
CPU GTL Reference (2): Auto
CPU GTL Reference (3): Auto
NB GTL Reference: Auto
DDR2 ChA Reference Voltage: Auto
DDR2 ChB Reference Voltage: Auto
North Bridge DDR Reference: Auto









CPU Configuration:

Ratio CMOS Setting: 9
C1E Support: Disabled
Max CPUID Value Limit: Disabled
Intel Virtualization Tech: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled

Load-Line Calibration: Enabled
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled