OC Problem 790i Ultra SLI
Hi all,
I'm having trouble finding stable settings for overclocking my system:
-nvidia nforce 790i Ultra SLI (FSB 1333MHz default, want 1600MHz)
-Q9450 @ 2.66GHz default (want 3.2GHz)
-Patriot Viper xtreme 2x4GB 1600MHz (1066MHz default, want 1600MHz)(in black slots)
-Geforce GTX460 1GB
-Couple of crappy Seagate HDD's

Tried the following settings, got a good boot, checked CPU-Z and it reported the default speeds (CPU-2.66GHz, FSB-1333MHz, Mem-1066MHz). Restarted, checked BIOS, all was set properly at my OC'd config. Confused, I restarted and got blue screen, and can't get stable boot now except in BIOS default. Suggestions? Thanks in advance for your time.


**System **
CPU Freq, MHz: 3.0Ghz
FSB Reference Clock, 1600
CPU Multiplier: 8X
CPU N/2 Ratio: Disabled
PCle x16-1 & 16-2, MHz: [Auto] 100
PCle x16-3, MHz: [Auto] 100
SPPc->MCP Ref Clock, MHz: [Auto] 200
nForce SPP --> nForce MCP: [5X]
nForce SPP c-- nForce MCP: [5X]

**Spread Spectrum**
CPU Spread Spectrum: [Disabled]
HT Spread Spectrum: [Disabled]
PCle Spread Spectrurn(SPP): [Disabled]
PCle Spread Spectrurn(MCP): [Disabled]
SATA Spread Spectrum: [Disabled]

**FSB & Memory Config**
FSB - Memory Clock Mode: [Linked]
FSB - Memory Ratio: [Synced]
FSB (QDR), MHz: 1600
Actual FSB (QDR), MHz: 1600
xMEM (DDR), MHz : Auto 1600
Actual MEM (DDR), MHz: 1600
P1: [Auto]
P2: [Auto]

**Memory Timing Setting**
Memory Timing Setting: [Manual]
tCL (CAS Latency): 9
tRCD: 11
tRP: 9
tRAS: 27
Command Per Clock: [2T]

** Advanced Memory Settings **
tRRD: [Auto(5)] 5
tRC: [Auto(34)] 34
tWR: [Auto(12)] 12
tWTR: [Auto(16)] 16
tFAW: [Auto(26)] 26
tREF: 7.8uS
tRFC: [Auto (74)] 74

**System Voltages**
(Manually set System Voltages)
CPU Core: (1.32v)
CPU FSB: (1.25v)
Memory: (1.65v)
nForce SPP: [Auto] 1.40V
nForce MCP: [Auto] 1.55V
GTLVREF Lane 0: [Auto] +00mv
GTLVREF Lane 1: [Auto] +00mv
GTLVREF Lane 2: [Auto] +00mv
GTLVREF Lane 3: [Auto] +00mv

**CPU Configuration**
Limit CPUlD Maxval: [Disabled]
Intel Speedstep: [Disabled]
xPPM Mode: [Native Mode]
CPU Thermal Control: [Disabled]
C1E Enhanced Halt State: [Disabled]
Execute Disable Bit: [Disabled]
Virtualization Technology: [Disabled]
Hi all,

I'm having trouble finding stable settings for overclocking my system:

-nvidia nforce 790i Ultra SLI (FSB 1333MHz default, want 1600MHz)

-Q9450 @ 2.66GHz default (want 3.2GHz)

-Patriot Viper xtreme 2x4GB 1600MHz (1066MHz default, want 1600MHz)(in black slots)

-Geforce GTX460 1GB

-Couple of crappy Seagate HDD's



Tried the following settings, got a good boot, checked CPU-Z and it reported the default speeds (CPU-2.66GHz, FSB-1333MHz, Mem-1066MHz). Restarted, checked BIOS, all was set properly at my OC'd config. Confused, I restarted and got blue screen, and can't get stable boot now except in BIOS default. Suggestions? Thanks in advance for your time.





**System **

CPU Freq, MHz: 3.0Ghz

FSB Reference Clock, 1600

CPU Multiplier: 8X

CPU N/2 Ratio: Disabled

PCle x16-1 & 16-2, MHz: [Auto] 100

PCle x16-3, MHz: [Auto] 100

SPPc->MCP Ref Clock, MHz: [Auto] 200

nForce SPP --> nForce MCP: [5X]

nForce SPP c-- nForce MCP: [5X]



**Spread Spectrum**

CPU Spread Spectrum: [Disabled]

HT Spread Spectrum: [Disabled]

PCle Spread Spectrurn(SPP): [Disabled]

PCle Spread Spectrurn(MCP): [Disabled]

SATA Spread Spectrum: [Disabled]



**FSB & Memory Config**

FSB - Memory Clock Mode: [Linked]

FSB - Memory Ratio: [Synced]

FSB (QDR), MHz: 1600

Actual FSB (QDR), MHz: 1600

xMEM (DDR), MHz : Auto 1600

Actual MEM (DDR), MHz: 1600

P1: [Auto]

P2: [Auto]



**Memory Timing Setting**

Memory Timing Setting: [Manual]

tCL (CAS Latency): 9

tRCD: 11

tRP: 9

tRAS: 27

Command Per Clock: [2T]



** Advanced Memory Settings **

tRRD: [Auto(5)] 5

tRC: [Auto(34)] 34

tWR: [Auto(12)] 12

tWTR: [Auto(16)] 16

tFAW: [Auto(26)] 26

tREF: 7.8uS

tRFC: [Auto (74)] 74



**System Voltages**

(Manually set System Voltages)

CPU Core: (1.32v)

CPU FSB: (1.25v)

Memory: (1.65v)

nForce SPP: [Auto] 1.40V

nForce MCP: [Auto] 1.55V

GTLVREF Lane 0: [Auto] +00mv

GTLVREF Lane 1: [Auto] +00mv

GTLVREF Lane 2: [Auto] +00mv

GTLVREF Lane 3: [Auto] +00mv



**CPU Configuration**

Limit CPUlD Maxval: [Disabled]

Intel Speedstep: [Disabled]

xPPM Mode: [Native Mode]

CPU Thermal Control: [Disabled]

C1E Enhanced Halt State: [Disabled]

Execute Disable Bit: [Disabled]

Virtualization Technology: [Disabled]

#1
Posted 03/31/2012 06:45 AM   
You need to be walking the frequency up slowly and adjusting the voltages as needed, not just jumping from 2.6 to 3GHz.
^Raptor is correct if you have the time, a quicker way (specially with such a low overclock) I would start by setting your NB to 1.5 and CPU to 1.35. Nothing should be auto excepted advanced memory timings (unless you know how to set these). This will get you stable and its not too much voltage to be worried about. As you have time to test for stability, drop your voltage slowly. If you dont have time, its not too high and can be run just fine.

GTL is a must and will only be adjusted when you change your VTT. But, this can be tricky. Some boards operate their GTL's at weird ratios, but with a quad core, it should be at .635 vice .677. IIRC, your lane 0 and 2 are already set at .635 and your lane 1 and 3 are at .667. You will need to adjust lanes 1 and 3 to values of a .635 ratio using the below formula (this goes for your NB GLT if you have it). Remember, with a quad core you will generally only be adjusting down (negative numbers).

VTT x .677 - VTT x .635

In your case, with VTT at 1.25 (this should never have to go over 1.3V btw), your lane 1 and 3 should be set at -40 (or the closest value). If you have a NB GTL, this should also be set at -40. Let me know if this helps or makes it worse.

Another good tip: Memory timings should be relaxed considerably to factor out memory instability. That way you are only worried about CPU and moboard in your initial overclock. Once you are stable, you can ramp up your memory knowing that the only three factors affecting your clock rate stability are mem timing, NB volt, and memory volts. If you are running your memory at stock settings, its generally safe to assume the memory is stable and any instabilities are with the NB, giving you only one setting to tweak: NB voltage. Makes things a lot easier.
^Raptor is correct if you have the time, a quicker way (specially with such a low overclock) I would start by setting your NB to 1.5 and CPU to 1.35. Nothing should be auto excepted advanced memory timings (unless you know how to set these). This will get you stable and its not too much voltage to be worried about. As you have time to test for stability, drop your voltage slowly. If you dont have time, its not too high and can be run just fine.



GTL is a must and will only be adjusted when you change your VTT. But, this can be tricky. Some boards operate their GTL's at weird ratios, but with a quad core, it should be at .635 vice .677. IIRC, your lane 0 and 2 are already set at .635 and your lane 1 and 3 are at .667. You will need to adjust lanes 1 and 3 to values of a .635 ratio using the below formula (this goes for your NB GLT if you have it). Remember, with a quad core you will generally only be adjusting down (negative numbers).



VTT x .677 - VTT x .635



In your case, with VTT at 1.25 (this should never have to go over 1.3V btw), your lane 1 and 3 should be set at -40 (or the closest value). If you have a NB GTL, this should also be set at -40. Let me know if this helps or makes it worse.



Another good tip: Memory timings should be relaxed considerably to factor out memory instability. That way you are only worried about CPU and moboard in your initial overclock. Once you are stable, you can ramp up your memory knowing that the only three factors affecting your clock rate stability are mem timing, NB volt, and memory volts. If you are running your memory at stock settings, its generally safe to assume the memory is stable and any instabilities are with the NB, giving you only one setting to tweak: NB voltage. Makes things a lot easier.

Making stupid look good.



Rig:

Thermaltake Armor

Q9650 @ 4.05, 1800FSB

Striker II Extreme

4GB Patriot 2000 @ 8-8-8-26

x2 150GB WD VRaptor Drives in RAID 0

x2 Segate 320GB RAID 0 Secondary Data Backup

-1TB and 750GB Western Digital Mybooks for backup

x3 EVGA 9800 GTX+ SLI @ 1.45V ~900 core, 2300 shader, 1250 mem



Watercooling:

FuZion 2.0

Enzotech NB Block

x3 Swiftech Obsidians

MCP 655 With EK Top Rev 2

120 and 240 Black Ice Pro GT Stealth Rads

120 DangerDen XFlow rad



http://forums.nvidia.com/index.php?showtopic=145895: Watercooling Guide for Beginners



http://forums.nvidia.com/index.php?showtopic=138732: Watercooling Pics Posted Here

#3
Posted 03/31/2012 02:40 PM   
I'll try these, thank you.
I'll try these, thank you.

#4
Posted 03/31/2012 04:26 PM   
RaptR, thank you for the tip. I am new to this stuff, so anything helps. Just so you know where I am coming from with this, I figured that since my RAM and Mobo are both rated to run at 1600MHz, it would be safe to sync them there. Changing FSB to 1600MHz automatically OC'd my processor to 3.2GHz, that wasn't something I changed manually at all. From there I did walk the voltages up to the settings that I posted, and stopped there because of what I thought was a successful boot, but wasn't (see story).

Are you saying I should be walking my FSB and RAM frequencies up instead of trying to get them stable synced at 1600MHz? If so, where should I start, and what increments should I use? Thanks.
RaptR, thank you for the tip. I am new to this stuff, so anything helps. Just so you know where I am coming from with this, I figured that since my RAM and Mobo are both rated to run at 1600MHz, it would be safe to sync them there. Changing FSB to 1600MHz automatically OC'd my processor to 3.2GHz, that wasn't something I changed manually at all. From there I did walk the voltages up to the settings that I posted, and stopped there because of what I thought was a successful boot, but wasn't (see story).



Are you saying I should be walking my FSB and RAM frequencies up instead of trying to get them stable synced at 1600MHz? If so, where should I start, and what increments should I use? Thanks.

#5
Posted 03/31/2012 05:47 PM   
StAndrew, I'm sorry to have to bug you with this, but I am fairly new to hardware. I tried to figure this out without having to ask, but I just don't see what you mean by "NB" or by "VTT". Also, the GTL settings make sense when you say to set them at "-40mV" but I don't understand the values ".677" and ".635".

Thank you for your patience, and again, I'm sorry that I need more help than your average poster here.
StAndrew, I'm sorry to have to bug you with this, but I am fairly new to hardware. I tried to figure this out without having to ask, but I just don't see what you mean by "NB" or by "VTT". Also, the GTL settings make sense when you say to set them at "-40mV" but I don't understand the values ".677" and ".635".



Thank you for your patience, and again, I'm sorry that I need more help than your average poster here.

#6
Posted 03/31/2012 05:53 PM   
NB aka SPP is your northbridge and should probably be a bit higher. 1.5v should do. Your nb voltage will stabilize your higher fsb speeds and sometimes required for higher memory speeds.

Your vtt is the same as your cpu fsb voltage. Dont worry about the ratios for your glt, just use the formula to normalize your gtl based off your fsb/vtt voltage.

Let me know if you still have stability issues. Good luck!
NB aka SPP is your northbridge and should probably be a bit higher. 1.5v should do. Your nb voltage will stabilize your higher fsb speeds and sometimes required for higher memory speeds.



Your vtt is the same as your cpu fsb voltage. Dont worry about the ratios for your glt, just use the formula to normalize your gtl based off your fsb/vtt voltage.



Let me know if you still have stability issues. Good luck!

Making stupid look good.



Rig:

Thermaltake Armor

Q9650 @ 4.05, 1800FSB

Striker II Extreme

4GB Patriot 2000 @ 8-8-8-26

x2 150GB WD VRaptor Drives in RAID 0

x2 Segate 320GB RAID 0 Secondary Data Backup

-1TB and 750GB Western Digital Mybooks for backup

x3 EVGA 9800 GTX+ SLI @ 1.45V ~900 core, 2300 shader, 1250 mem



Watercooling:

FuZion 2.0

Enzotech NB Block

x3 Swiftech Obsidians

MCP 655 With EK Top Rev 2

120 and 240 Black Ice Pro GT Stealth Rads

120 DangerDen XFlow rad



http://forums.nvidia.com/index.php?showtopic=145895: Watercooling Guide for Beginners



http://forums.nvidia.com/index.php?showtopic=138732: Watercooling Pics Posted Here

#7
Posted 03/31/2012 11:11 PM   
StAndrew, set SPP to 1.5v and core to 1.35v. Set Lane1 to -40mv and Lane3 to -40mv.
RAM timings were 8-9-8-24 (native factory timings) and tried 1.65v and 1.70v.

No boot in either case.
StAndrew, set SPP to 1.5v and core to 1.35v. Set Lane1 to -40mv and Lane3 to -40mv.

RAM timings were 8-9-8-24 (native factory timings) and tried 1.65v and 1.70v.



No boot in either case.

#8
Posted 04/01/2012 12:04 AM   
Give this a read , it may help you ...


790 Ultra + Q9450 Overclocking



[url="http://www.evga.com/forums/tm.aspx?&m=1057198&mpage=1"]http://www.evga.com/forums/tm.aspx?&m=1057198&mpage=1[/url]
Give this a read , it may help you ...





790 Ultra + Q9450 Overclocking







http://www.evga.com/forums/tm.aspx?&m=1057198&mpage=1

Image

#9
Posted 04/01/2012 08:30 AM   
[quote name='Grimpen' date='31 March 2012 - 08:04 PM' timestamp='1333238647' post='1390508']
StAndrew, set SPP to 1.5v and core to 1.35v. Set Lane1 to -40mv and Lane3 to -40mv.
RAM timings were 8-9-8-24 (native factory timings) and tried 1.65v and 1.70v.

No boot in either case.
[/quote]

First i would try bumping you fsb to 1.3v (gtl should be -42 or closest value). Then loosen up your mem timings for now. Slowly bump up your nd voltage and check for stability. 1.35 should be plenty for a 3.2 ghz on ur cpu but you can try bumping that up too. What are ur temps looking like?

U can also try setting all of your gtl volts to -40. Some moboards are diff so i dont know what ur stock settings are for gtl.
[quote name='Grimpen' date='31 March 2012 - 08:04 PM' timestamp='1333238647' post='1390508']

StAndrew, set SPP to 1.5v and core to 1.35v. Set Lane1 to -40mv and Lane3 to -40mv.

RAM timings were 8-9-8-24 (native factory timings) and tried 1.65v and 1.70v.



No boot in either case.





First i would try bumping you fsb to 1.3v (gtl should be -42 or closest value). Then loosen up your mem timings for now. Slowly bump up your nd voltage and check for stability. 1.35 should be plenty for a 3.2 ghz on ur cpu but you can try bumping that up too. What are ur temps looking like?



U can also try setting all of your gtl volts to -40. Some moboards are diff so i dont know what ur stock settings are for gtl.

Making stupid look good.



Rig:

Thermaltake Armor

Q9650 @ 4.05, 1800FSB

Striker II Extreme

4GB Patriot 2000 @ 8-8-8-26

x2 150GB WD VRaptor Drives in RAID 0

x2 Segate 320GB RAID 0 Secondary Data Backup

-1TB and 750GB Western Digital Mybooks for backup

x3 EVGA 9800 GTX+ SLI @ 1.45V ~900 core, 2300 shader, 1250 mem



Watercooling:

FuZion 2.0

Enzotech NB Block

x3 Swiftech Obsidians

MCP 655 With EK Top Rev 2

120 and 240 Black Ice Pro GT Stealth Rads

120 DangerDen XFlow rad



http://forums.nvidia.com/index.php?showtopic=145895: Watercooling Guide for Beginners



http://forums.nvidia.com/index.php?showtopic=138732: Watercooling Pics Posted Here

#10
Posted 04/01/2012 12:53 PM   
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