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Pentium D 805

post #1 of 19
Thread Starter 
I know i've posted this before but I seriously am still at a loss as to what is going wrong with my Pentium D 805 OC. My problem is such: I can overclock the chip pretty high (3.5-3.6Ghz) and it remains stable after 10-12 hours of orthos testing, but when i play games every so often my computer just freezes. This leads me to believe that it is not in fact the temperature that is causing my OC to fail but something else. So my question to anyone is what is my problem?

I have a few ideas, it could be my motherboard (ASUS 955X P5WD2 non-premium) since it doesn't have as many voltage regulators (is that the right term?) as the premium version. It also could be my powersupply and it's low wattage and perhaps quality (Antec Neo power 500watt) This might explain the freezing during games since the graphics card is hogging more power. The final thought I have is that the problem stems from the voltage in the processor and it being too low, or worst case scenario I just got a ****ty Pentium D 805 and it can't OC very well. Lemme know what you guys think the problem is or how i could go about troubleshooting. Really any help is much appreciated.
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805 Goodness
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2 x 80gb SATA II RAID 0 WinXP pro / Ubuntu 19" Sony Microsoft 
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post #2 of 19
your memory could not be stabe. use memtest to test it.
might be your GPU, since its only when gaming.
post #3 of 19
mem should be fine..its the PSU for sure..at ~3.6ghz your cpu is pulling around 200-220W by itself!

*try the pin mod for the 805...it will default to a 3.3ghz cpu at 667mhz FSB!
post #4 of 19
Thread Starter 
What will modding the voltage on the chip do? Is that any different from changing the voltage to the chip in the bios?
805 Goodness
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805 Goodness
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post #5 of 19
Quote:
Worked !!! I just put a tiny tape on the BSEL1 pad of the CPU to make BSEL[2:0] LHH and I saw that 1/5 PCI divider was activated on Clockgen after booting to Windows. But BIOS still sets FSB to 133. So the PCI frequency was 133/5. Then, I set FSB to 165, every frequency becomes normal on the motherboard but CPU is overclocked to 3.3 GHz. I am not expecting more than this on a $20 MB. PCChips is the new overclocking king
read more here.

more info...
Quote:
Putting a tiny insulating tape on the pad with red circle will set BSEL[2:0] to LHH which is originally LLH.

This worked. On the other hand I did not change the VID which can also be done with similar mods using the landing pads. PD805 draws too much power when overclocked past 3.5-3.6 GHz. I do not think PG13+ can handle that power demand. And, I know that most, if not all, PD805 can overclock to 3.3 GHZ without any voltage change. So, my target was 3.3 GHz with this motherboard and it is achieved.
Attachment 51612

post #6 of 19
Quote:
What will modding the voltage on the chip do? Is that any different from changing the voltage to the chip in the bios?
vmod'ing the cpu is for starting up at a higher than default speed. If you mod your 805 to run on the 800mhz FSB it would start at 4ghz by default...this would require you to also do the vmod, as the cpu would not POST without having the proper voltage to start up.

As you can read above, the 667FSB mod is much better as the cpu doesnt need much vcore to boot at 3.3ghz.
post #7 of 19
Thread Starter 
Ok, so if i do the pin mod and boost it to 3.33Ghz which is what i have it at now through my mobo. Will i still be able to OC past 3.33 to say 3.6ish? or will this simply require a new PSU?

I also don't see the point in doing all of this since my motherboard can change all of these values in the bios... or is this a more stable way of OCing the 805?
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805 Goodness
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2 x 80gb SATA II RAID 0 WinXP pro / Ubuntu 19" Sony Microsoft 
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post #8 of 19
Read my thead it could help its in sig.
    
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WD 1TB SATA3 + 4TB Storage External USB Thermalright Archon Win 7 Pro x64 
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post #9 of 19
Thread Starter 
I actually have already glanced over that thread. Maybe i didn't dig deep enough, but it seemed that most of that was just people posting results and not really troubleshooting OCing issues. I'll look more in depth though
805 Goodness
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CPUMotherboardGraphicsRAM
Pentium D 805 ASUS P5WD2 (non-premium) Geforce 7800GT 1024 Corsair Twin X 
Hard DriveOSMonitorKeyboard
2 x 80gb SATA II RAID 0 WinXP pro / Ubuntu 19" Sony Microsoft 
PowerCaseMouseMouse Pad
Silverstone 700 W Lian-Li mx518 Steelpad Qck+ 
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805 Goodness
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CPUMotherboardGraphicsRAM
Pentium D 805 ASUS P5WD2 (non-premium) Geforce 7800GT 1024 Corsair Twin X 
Hard DriveOSMonitorKeyboard
2 x 80gb SATA II RAID 0 WinXP pro / Ubuntu 19" Sony Microsoft 
PowerCaseMouseMouse Pad
Silverstone 700 W Lian-Li mx518 Steelpad Qck+ 
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post #10 of 19
Quote:
Ok, so if i do the pin mod and boost it to 3.33Ghz which is what i have it at now through my mobo. Will i still be able to OC past 3.33 to say 3.6ish? or will this simply require a new PSU?
Yes, the pin mods, help with added stability for OC'ing farther. But..your PSU is limiting your OC..with your CPU loaded at 3.6ghz, it is getting close to 250W of power consumption. Add that into the power used for the rest of your rig and you are fast approaching the cutoff point for output voltage on your PSU. If your Antec is rated for 550W, then you should be using no more than 300-350W of that available 550W, for stable voltage regulation. Going beyond that range [as you are now] can cause all kinds of failures as components simply dont have the power required to operate correctly..whether from the CPU soaking it all up, or the PSU not stabilizing its output at that high of a load.
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