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EVGA nforce 790I Ultra and TWIN3X4096-16000C7DHXIN


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I ended up with these combination of motherboard and RAM.

The memory speed detected by the board is 1067 MHz which is clearly incorrect. The ram is placed in alternate slots (slot #2 and #4 from the CPU socket, the black slots). I read that these should be used for anything higher than 1333 MHz.

Can anyone suggest the voltages tweaks that I'd need to perform in order to get this RAM running at 1600MHz.


I've looked at this as a guide http://www.houseofhelp.com/forums/showthread.php?t=54052

(the last bit about EVGA settings). However, the SPP voltages are too high from my understanding.


Please let me know asap.




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Having the BIOS set the values correctly would be Plug & Play. In actuality it is Plug & Pray. :D:


You must set the values in the BIOS. Even so, the Nvidia chipsets are known to be wonky with high end DRAM. Some have to RMA more than once to get a board that actually works correctly with high end DRAM.


For your research:



Download Memtest86+ V2.01 from--->

Download CPU-z from

For your DRAM to run at 1600Mhz you are advised set your FSB to 400Mhz to achieve the 1:1 ratio that Intel demands as a minimum. Drop your multiplier and raise the FSB. Enter your BIOS. Load setup defaults, save setup defaults and set to these values:

Extreme Tweaker

CPU Level Up = Disabled
Memory Level Up = Disabled 

AI Overclock Tuner = Manual
CPU Multiplier = 8.5
FSB - Memory Clock Mode = Unlinked
FSB (QDR) = 1600 (400)
MEM (DDR) = 1600 (800)
LDT Frequency = 5X
PCIE BUS, Slot 1 & 2, Mhz = 100
PCIE BUS, Slot 3, Mhz = 100
SPP <--> Ref Clock, Mhz = 200

Memory Timing Section

tCL (CAS Latency) = 7
tRCD = 7
tRP = 7
tRAS = 20
Command Per Clock = 2T

Advanced Memory Settings

tRRD = Auto
tRC = Auto
tWR = Auto
tWTR = Auto
tFAW = Auto
tREF = Auto

Over Voltage = All Set to Auto

CPU Configuration

CPU Internal Thermal Control = Auto
Lmit CPUID MaxVal = Disabled
Execute Disable Bit = Enabled
Virtualization Technology = Enabled
Enhanced Intel Speedstep(tm) Tech = Disabled

CPU Core 2 = Enabled
CPU Core 3 = Enabled
CPU Core 4 = Enabled

[b]System Voltages[/b]

CPU Core = Auto
CPU FSB = Auto 
Memory = 1.9v
nForce SPP = Auto	
nForce MCP = 1.55	
HT nForce SPP <-> MCP = Auto


Run Memtest for two full passes. When assured of stable DRAM, then enter Windows and run CPU-z. Please post screenshots of the CPU-z CPU, Memory and SPD tabs.

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Okay ran two passes successfully without errors.

Here are the screenshots from CPU-Z.


Any idea why my machine hung just when I hit ESC to exit Memtest to reboot the PC?





If you pass Memtest, then the issue is external to the DRAM.


Other than that one hang, how's the system stability? Don't ever let one single instance determine an issue. Repeating proof of instability is necessary. For one time can easily be an anomaly.

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