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Cant get 1066MHZ 8500C5D & P5N32-E SLI


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I have a P5N32-E SLI Motherboard and Dominator twin2x2048-8500c5d and the fastest stable speed i can get is 934Mhz. Do you know the correct BIOS settings for this combo to get a stable 1066Mhz?


I have tried SLI ready memory at 0%OC set memory voltage for 2.2V and set memory to 5-5-5-15 2T. And disabled Legacy USB. And even tried bumping NB voltage to 1.5V. But can only get it stable at 934Mhz. testing with memtest86. Anything over 934Mhz gives many errors.


Thanks for the help RamGuy!


PS. My other components are intel qx6850 processor, dual EVGA 8800GTX and Audigy 2 Pro Sound card. Also Bios for mother board is latest one.

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This is for population of 2Banks. Only 2 X 1024 of 8500C5 V2.xx

Enter BIOS. Load Default Settings. Save Default Settings. Do NOT overclock your CPU FSB. Set to these values:


Multiplier = 9

FSB = 333

DRAM = Unlinked and set to 1066Mhz


Memory Timing


FSB - Memory Clock Mode: Unlinked

CPU FSB: 333

CPU Multi: 9

DDR FSB: 1066

tCL: 5

tRCD: 5

tRP: 5

tRAS: 15


Advanced Memory Settings

tRRD: 5

tRC: 24

tWR: 6

tWTR: 8

tREF: Auto

tRD: 7

tRFC: 42

Async Latency: Auto



CPU Spread Spectrum: Disabled

PCIE Spread Spectrum: Disabled

MCP PCIE Spread Spectrum: Disabled

SATA Spread Spectrum: Disabled

LDT Spread Spectrum: Disabled


CPU Internal Thermal Control: Enabled

Limit CPUID MaxVal: Enabled

Enhanced C1 (C1E): Enabled

Execute Disable Bit: Enabled

Virtualization Technology: Enabled

Enhanced Intel Speedstep Tech: Enabled

LDT Frequency: 5x


PCIEX16_1 Frequency (Mhz): 101

PCIEX16_2 Frequency (Mhz): 101

PCIEX16_3 Frequency (Mhz): 101

SPP<->MCP Ref Clock, Mhz: 201



Vcore = 1.35v

Vdimm (DRAM Voltage) = 2.2v

Termination Voltage = 1.4v

1.2v HT: 1.3v

NB Vcore: 1.4v

SB Vcore: 1.50v

CPU VTT: 1.30v


Test with Memtest. Results?

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Tried these settings and still getting many errors with memtest86. memory tests fine at 800mhz and 934mhz. any higher and errors. Memory seems fine just cant get it up too speed. please help as i have always had corsair. dont wanna switch.
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  • Corsair Employees
Test the modules one at a time, if they both fail at less than 1066MHz when tested individually then there is something else holding you back. If one of them hits 1066MHz, and the other one stops at 934Mhz then we need to get them both replaced.
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