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A little help with a core i7 920 overclock on an EX-58 UD5 mobo.

post #1 of 3
Thread Starter 
Hello everyone, first post and I’m here begging for help!

My situation is this: About 2 years back I built my current rig (specs below) and had a stable overclock of my i7 920 at about 3.8 ghz. Being an idiot, I didn’t write down the bios settings. Now a few days ago I lost my BIOS settings and had to re do the overclock. In the process I accidentally over clocked my RAM by quite a margin (Forgot to check the bloody RAM multiplier). I thought I’d got away with it, but many bluescreens later followed by a complete failure to even load windows I ran the pre windows memtest and it reported back errors.

I was looking at upgrading my RAM anyway so I grabbed some corsair XMS 3 rated at 2000mhz. I installed the modules today (taking out the broken ones obviously) and have had nothing but grief since.

Anything other than a tiny attempt to change the base clock results in a complete failure to boot. At 140, it refuses to boot. At 139 it will boot to windows but is so unstable it will crash within a minute. Considering I could run it happily at 180-190 before this is a big step backwards!

I can clock the RAM to just under its rated speed ( 1918 at the moment) and the system will boot and be stable. The only reason I’m not at 2000 is the next step up takes it over that, and I don’t want to be playing around there until I get the proc sorted.

I’ve done everything I can think of to ensure stability. I’ve upped the V-core to 1.4 and the RAM 1.660. the QPI has been set to 1.515 (I was anticipating an overclock of at least 3.7 ghz) I’ve ensured the uncore is set to at least twice the speed of the RAM, and even one step higher.

Nothing seems to work. At base clock 140 the rig doesn’t boot. At 139 it’s so unstable it’s not usable. At the moment I’m running it at 137.

I’ev also tried setting the base clock at 140 and lowering the CPU multiplier to the point where the CPU is underclocked but still no boot.

As I can set my ram at nearly 2ghz with no issues as well, I’m thinking it’s a QPI issue. But the QPI V set to that level, surely it can’t be unstable?

Obviously I’ve turned off turbo mode and the usual power saving gubbins.

So any ideas? I’m stumped, especially given I could get a fine overclock that ran for over a year before I changed the RAM

System:
Core i7 920
Gigabuye EX-58 UD5
Corsair XMS3 DDR3 rated for 2ghz at 1.65V (3X2 gig sticks) – current RAM recently installed.
post #2 of 3
have you checked what is the max ram speed your motherboard supports? Also there is nothing wrong with just dropping the ram divider. It is a little harder on Intel rigs because with an amd you can set decimal ram multipliers. why did you switch ram? it sounds like the old sticks worked much better.
Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
  hide details  
Reply
Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
  hide details  
Reply
post #3 of 3
Thread Starter 
The mobo supports up to 2100. I swapped the RAM becuase the previosu set up was failing a memtest. The issue isn't overclocking the RAM, it's the processor, specifically the base clock speed.
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