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I5 750 cannot exceede 160 BCLK. Many problems ruled out.

post #1 of 33
Thread Starter 
Hello! As a frequent lurker of Overclock.net I'm happy I can finally be involved in a thread! Unfortunately, I come at a time of need.

I have an EVGA P55 LE motherboard and an I5 750 processor. I have 8GB of RAM, all identical sticks. I initially tried to overclock this computer a few months ago, getting the processor to 4.0ghz, and while I had some problems, I eventually got the computer stable. Even then, however, the computer would start, reset, and then start again everytime I turned the computer on from being shut off. That first little boot wouldn't even get to BIOS, it would shut off in almost 5 seconds before automatically starting up again, but this time, successfully launching windows.

This is particularly odd considering the stability of the system with very low temperatures. Even after testing with Linx, prime65 and real-world applications like FMLE and high-end video games, it didnt skip a beat.

This led me to ignore the problem entirely (perhaps not the wisest of decisions) while telling myself I would come back to it later.

Fast forward to last night. I needed to reset Bios in an attempt to fix a separate issue and of course it wiped all of my overclock settings. I went back in and set them to what I thought I had set before and to my surprise, the computer would not boot.

More specifically it would start up, fans spinning, disc drive whirling, but about 5 seconds in, it would shut off. Nothing would pop up on the screen and no motherboard beeps would give me any hint. Like I said before, this would happen once with my "successful" overclock, but it would then start up normally. This time it didn't. It would, as far as I can tell, restart indefinitely until I reset BIOS again.

I have researched everything that is possible (actually, this is probably impossible) to know about voltages and CPU settings for the optimal overclock and have gone through many different combination of Vcore voltage, DIMM voltage, VTT voltage and more. Nothing would allow me to boot with my multiplier at 20 and my BCLK at 200.

To narrow down the problem, I tuned to voltages to what would make a stable and rather power-frugal 4.0ghz overclock and set the BCLK to 140, it worked fine. I then upped the BCLK to 150, and then 160, both worked fine.

It was then I tried BCLK 170 that I returned to the dreaded infinite restart.

I tried to change around more voltages, fine tuning as best as I can. Despite my efforts, I could not get the BCLK any higher, despite having not only gotten it there previously, but my settings also being within normal working limits.

So, before I ask all of you fine gentlemen and women what my problem can be. Let me tell you some of the steps I've taken.

I have update my BIOS. I was pretty sure it was updated before but I double checked.

I updated my chipset. Again, wasn't surprised that this wasn't the issue.

I've done considerable work with the voltages and actual CPU settings as I have detailed above. This includes turning off the CPU options like SpeedStep, Turbo and C-States.

I have reseated the CPU, reset the RAM and made sure everything is not dead.

As far as I can tell, this is NOT a hardware issue. As I mentioned above I got this working once before, I must simply be missing something.

If I had to guess at this point (and this is definitely a guess) I would say that it might be my PSU. It is a new Corsair 80 Plus certified unit, but it's Wattage is only 650. From my research, this should be enough to handle what I am trying to do (and remember, I got this working before), but considering I'm kind of desperate, I'm not ruling anything out.

So I ask of you, the community, please offer any advice you can. If you need any more information from me please do not hesitate to ask. I will be checking this thread very often throughout the day so please dont think you'll post something that will not be read.

Thank you in advance.
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post #2 of 33
If those are four 2GB sticks of RAM, take two of them out and try OCing then.
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post #3 of 33
I have the exact same mobo and the exact same problem. If you let the error code go d4, 68, ff a couple of times it will start fine. You'll see d4 go to d5 and then the whole system will boot. My FSB is at 197 right now. Higher FSBs cause it to loop more times but it will always start after about 20 seconds of sitting there "***ing" at itself. I originally just got angry and tore it out and put my old one back in, but since I've taken the time to kinda toy with it and let it work out its own problems, it's worked much much better. It ALWAYS loops twice, but sometimes more. If you can stand that happening then it's not a big deal. I also have a Corsair TX650 as well. It could be a Corsair/EVGA issue but like I said, it does work, it just takes some patience.

Hope this helps!
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24/7 Black Box
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Hard DriveOptical DriveOSMonitor
1TB stock HP + 60GB OCZ Solid 2 SSD Stock HP DVD-RW Windows 7 64 bit Home Edition Hp L2445m 24" 
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post #4 of 33
Thread Starter 
Tomalak - This is a possibility I have heard of and keep forgetting to try. I cant help but think this problem largely comes from not enough VTT voltage or an improper balance on Vcore and VTT voltage, but considering how many different combination I've used, some specifically citing 4 sticks of 2GB RAM being supported, I couldn't imagine it would be the problem. I will, however, try this when I get home. If you could, what would it mean if it does work? If it doesn't?

pencil364 - This is very interesting. After the second reboot I would always assume it would continue indefinitely. I will try this as well, however it's hard to be satisfied with a workaround like this and hopefully I can get to the bottom of the issue. Thank you for you reply!
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Samsung SSD 830 256gb Windows 7 64 bit Dell Ultrasharp 24" Steelseries 6gv2 
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post #5 of 33
I'm only saying it because a few of my friends have I5 750s which simply don't want to overclock higher with all RAM slots populated, regardless of VTT, memory frequency/latencies, or any other mambo-jumbo one might try.

EDIT: And yes, some EVGA P55 boards have a double boot "issue". Not sure if they fixed it in the meantime.
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post #6 of 33
It is curious for sure, and I'll be keeping an eye on this thread to see if you solve your problem. I agree it's hard to be satisfied with the workaround but this board overclocks much better than my older msi.

Also, to help us help you in any other situations you might have, add your system here
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1TB stock HP + 60GB OCZ Solid 2 SSD Stock HP DVD-RW Windows 7 64 bit Home Edition Hp L2445m 24" 
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24/7 Black Box
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CPUMotherboardGraphicsRAM
i5 750 3.74GHz @ 1.27V EVGA P55 LE EVGA GTX560Ti @ 950/1900/2400 6GB Samsung 1333 
Hard DriveOptical DriveOSMonitor
1TB stock HP + 60GB OCZ Solid 2 SSD Stock HP DVD-RW Windows 7 64 bit Home Edition Hp L2445m 24" 
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post #7 of 33
Thread Starter 
Tomalak - Interesting... Well, I will give it a shot just to further my understanding of the problem. I did get it working with all 4 before, but knowing whether or not 2 work at least narrows down my problem. Thank you for the suggestion!
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Samsung SSD 830 256gb Windows 7 64 bit Dell Ultrasharp 24" Steelseries 6gv2 
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Hard DriveOSMonitorKeyboard
Samsung SSD 830 256gb Windows 7 64 bit Dell Ultrasharp 24" Steelseries 6gv2 
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post #8 of 33
0x101 = increase vcore
0x124 = increase/decrease vcore or QPI/VTT...have to test to see which one it is
0x0A = unstable RAM/IMC, increase QPI first, if that doesn't work increase vcore
0x1E = increase vcore
0x3B = increase vcore
0xD1 = QPI/VTT, increase/decrease as necessary
0x9C = QPI/VTT most likely, but increasing vcore has helped in some instances
0x50 = RAM timings/Frequency or uncore multi unstable, increase RAM voltage or adjust QPI/VTT, or lower uncore if you're higher than 2x
0x116 = Low IOH (NB) voltage, GPU issue (most common when running multi-GPU/overclocking GPU)
0X00000109 << Not enough or too Much memory voltage
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Swag box m8
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post #9 of 33
Thread Starter 
overclock23578 - Where exactly would I find these error codes? Nothing appears on the screen during the reboots at all, so I'm not sure where to see this information.
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CPUMotherboardGraphicsRAM
I7 2700K @ 4.7ghz (1.3V)  ASUS P8Z68-V/GEN3 GIGABYTE GTX 560ti 16gb Corsair Vengeance DDR3 1600mhz 
Hard DriveOSMonitorKeyboard
Samsung SSD 830 256gb Windows 7 64 bit Dell Ultrasharp 24" Steelseries 6gv2 
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Corsair 650TX 650W 80Plus Antec 1100 Logitech G5 Everglide Titan 
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Macgyver PC
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CPUMotherboardGraphicsRAM
I7 2700K @ 4.7ghz (1.3V)  ASUS P8Z68-V/GEN3 GIGABYTE GTX 560ti 16gb Corsair Vengeance DDR3 1600mhz 
Hard DriveOSMonitorKeyboard
Samsung SSD 830 256gb Windows 7 64 bit Dell Ultrasharp 24" Steelseries 6gv2 
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post #10 of 33
I'm pretty sure those are blue screen of death codes...
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i5 750 3.74GHz @ 1.27V EVGA P55 LE EVGA GTX560Ti @ 950/1900/2400 6GB Samsung 1333 
Hard DriveOptical DriveOSMonitor
1TB stock HP + 60GB OCZ Solid 2 SSD Stock HP DVD-RW Windows 7 64 bit Home Edition Hp L2445m 24" 
KeyboardPowerCase
Microsoft Reclusa Razer-powered Corsair TX650 HAF 922 +SS window side panel 
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24/7 Black Box
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 750 3.74GHz @ 1.27V EVGA P55 LE EVGA GTX560Ti @ 950/1900/2400 6GB Samsung 1333 
Hard DriveOptical DriveOSMonitor
1TB stock HP + 60GB OCZ Solid 2 SSD Stock HP DVD-RW Windows 7 64 bit Home Edition Hp L2445m 24" 
KeyboardPowerCase
Microsoft Reclusa Razer-powered Corsair TX650 HAF 922 +SS window side panel 
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