Help Overclocking AMD FX-8150 on MSI 890FXA-GD70

March 4, 2013 at 16:43:13
Specs: Windows 7 Ultimate 64bi, AMD FX-8150 OC 4.4Ghz
I would like some help with overclocking my 8150 on MSI 890FXA-GD70, I have had this up to 4.4ghz using FSB and also 4.4ghz just using multiplier. when using FSB I lose my USB 3.0 but other then that both O.C. are Stable under prime95. I would like help getting past this point. I am running a custom water cooling loop and with 4.4ghz my max CPU temp is 38c. Using a CPU voltage of 1.4v and CPU PLL of 2.8v. when just using multiplier.

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March 4, 2013 at 19:19:56
What you're referring to as FSB is called the reference clock. Have you tried O/C'ing using combinations of multiplier & reference clock settings or strictly one or the other? What are you doing with the RAM & HTT settings?

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March 4, 2013 at 22:00:28
I have tried a combo of all three just reference clock, just multiplier, and a combo of both. With just reference clock, I get up to very high voltages quickly so I been using just multiplier and a combo.

These are the setting in my motherboard and default values

CPU FSB Freq = 200
CPU Ratio = x18 = 3.6Ghz
CPU-NB Ratio = x11 = 2200mhz
FSB/DRAM Ratio = 1:4 = 1600mhz default timings
HT Link Speed = x13 = 2600mhz
PCI-E Freq = 100
CPU VDD voltage = 1.275v
CPU-NB VDD voltage = 1.62v
CPU voltage = 1.275v
CPU-NB voltage = 1.62v
CPU PLL voltage = 2.5v
CPU DDR-Phy voltage = 1.2v
Dram voltage = 1.5v
DDR Vref voltage = 0.75v
DDR VTT voltage = 0.75v
NB voltage = 1.097v
NB PCI-E voltage = 1.82v
HT Link voltage = 1.2v
SB voltage = 1.1v

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March 4, 2013 at 22:13:33
Multiplier and Reference Clock @ 4.4Ghz @ 38c under full load prime95
Im only going to list the changes made

CPU reference clock = 227
CPU ratio = x19.5 = 4.426Ghz
CPU-NB Ratio = x10 = 2270mhz
FSB/DRAM Ratio = 1:1.33 = 1513mhz using stock timings
HT Link Speed = x11 = 2497mhz
CPU Voltage in bios set to = 1.394v in CPU-z shows under prime95 = 1.376
CPU-NB voltage = 1.202v
CPU PLL voltage = 2.552v
Everything else is same as default

Multiplier Only @ 4.4Ghz @ 36c under full load Prime95

CPU Ration = x22 = 4.4Ghz
CPU voltage in bios set to = 1.377v in CPU-z shows under prime95 =1.36
CPU PLL voltage = 2.552v
Everything else is same as default

It seems like when I get over 4.4Ghz and try to raise the voltage it won't get stable. Any suggestion would be helpful. FYI my CPU is under custom water cooling loop.

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