Settings to hit 1800 FSB with minimal voltage
With ram able to run at 1800 MHz :rolleyes:
Extreme Tweaker
CPU Level Up = Auto
Memory Level Up = Auto
AI Overclock Tuner = Manual
FSB - Memory Clock Mode = Linked
FSB - Memory Ratio = Sync Mode
FSB (QDR) MHz = 1800
MEM (DDR) MHz = 1800
LDT Frequency = 5x
PCIE Bus Slot 1 & 2 MHz = 100
PCIE Bus Slot 3 MHz = 100
SPP<->MCP Ref Clock, MHz = 200
SLI-Ready Memory = Disabled
Memory Timing Setting
P1 = Enabled
P2 = Enabled
(CMD) = 4GB and above should just go for 2T
tRRD = Auto (then set it to whatever the auto was)
tRC = The rule is don't go lower than tCAS + tRAS + 2 but will go abit lower than that with more voltage, usually gives memtest erros at test 4/5 if tightened too much
tWR = 12 but can go 10 with adequate voltage
tWTR = Auto (then set it to whatever the auto was)
tFAW = Auto (then set it to whatever the auto was)
tRD = Auto (then set it to whatever the auto was)
tRTP = Auto (then set it to whatever the auto was)
tRFC = Depends upon ram, if tighten too much you will get BSOD during os load
tREF = Auto, usually 7.8ms
Over Voltage
Loadline Calibration = Enabled
CPU PLL Voltage = Varies, if it helps running 24/7 q6600 VID 1.26 from 1066 (9 x actual FSB) to 3.8GHz, 1900 (8 x actual FSB) with 1.54vCore and VTT, with just 1.58v (actual 1.6) vPLL.
CPU VTT Voltage = Might be a good idea to set this same as vCore
NB Core Voltage = 1.56 minimum, P1 & P2 enabled should go up to 1.6. If you are more stable with more voltage then increase vDimm because ram takes it out NB. I can run 1900FSB with 1.58 (actual 1.6) vNB
SB Core Voltage = 1.5 unless changing PCI express busses and MCP to SPP freqs.
CPU GTL REFs Ratio = Depending on your VTT, formula is (VTT * 0.667) - (VTT * 0.635) for 65nm and (VTT * 0.635) - (VTT * 0.667) for 45nm (unconfirmed, I think positive number would work)
NB GTL REF Ratio = AUTO
DDR3 CHA1 Ref Volt = DDR3_REF
DDR3 CHB1 Ref Volt = DDR3_REF
DDR3 CHA2 Ref Volt = DDR3_REF
DDR3 CHB2 Ref Volt = DDR3_REF
CPU Configuration
CPU Internal Thermal Control = Auto - This doesn't affect OC ability.
Limit CPUID MaxVal = Disabled
Enhanced C1 (C1E) = Disabled
Execute Disable Bit = Enabled
Virtualization Technology = Disabled
Enhanced Intel SpeedStep(tm) Tech. = Disabled - Doesn't work with overclocked CPU.
CPU Core 2 = Enabled
CPU Core 3 = Enabled
CPU Core 4 = Enabled
Spread Spectrum Control
CPU Spread Spectrum = Disabled
PCIE Spread Spectrum = Disabled
MCP PCIE Spread Spectrum = Disabled
SATA Spread Spectrum = Disabled
LDT Spread Spectrum = Disabled
Run ram at stock timings and voltage. If this is unstable for you increase vDimm, loosen timings and/or disable P1 and P2. vDimm drops a bit on load and it does drop as low as what you set it to.
The most important thing is to run ram sync'ed with fsb.
Once you test small fft's on prime for at least 4 hours, try blend for another 8 h. Now monitor for any load drop on CPU load, if you do then GTL ref's are wrong; as I haven't got a 45nm CPU my guess is you should do a positive number. Having different gtl refs leads to instability on any clock, all gtl ref's EXCLUDING NB GTL and RAM GTL should be about the same. If it helps I run task manager with Update Speed set to Low then I regularly check for any drop by not being in front of the monitor for hours . If any core fails after 4h small fft's passed then you need to increase vDimm, vNB or SB (if you increase pci epxress busses or MCP to SPP freqs).