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1055T stuck at 3.8 GHz ;_;

post #1 of 33
Thread Starter 
Hello everyone. I apologize for yet another overclocking thread but the reasons for overclocks not being stable are so varied that I'm not quite sure what to do. My only experience with overclocking has been upping the FSB on my laptop.

Here are my numbers for the rig in the sig:

Base clock: 272MHz
Multiplier: 14
CPU clock: 272x14 = 3808MHz @ 1.4V
CPU/NB: 2448MHz @ 1.3V
HT Link: 2176MT/s @ Auto
DRAM: 1451MHz @ 1.5V

If I go any higher than 272 on the bclk, the computer won't boot (either stop responding at POST or at the Starting Windows sign). 3808 MHz is stable for 3 hours in Prime95, but for 3DMark11's physics test to complete, I have to take that down to 3724MHz (266 bclk)!

Any suggestions?
post #2 of 33
Bump up the cpu voltage and the send the ram voltage to 1.65...back down the HT-link to 2000mhz...increase cpu-nb voltage to 1.35 or 1.4v
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post #3 of 33
Although you are approaching the limits of what that chip could do with air cooling...really good chips get up to 4ghz
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post #4 of 33
Thread Starter 
Quote:
Originally Posted by amd-dude View Post
Bump up the cpu voltage and the send the ram voltage to 1.65...back down the HT-link to 2000mhz...increase cpu-nb voltage to 1.35 or 1.4v
Hey, I used to be at 3500MHz with my old air cooler at 2500MHz CPU/NB that was stable at 1.3V. Wouldn't it be stable at a lower frequency at the same voltage, even if the CPU speed is higher? But I'll try anyway.

Also the RAM is rated at its current timings (9-9-9-24-2T) at 1600MHz at 1.5V. Should I still bump up the voltage?
post #5 of 33
The cpu and cpu-nb speed go hand in hand...i will give u wa personal experience with just how connected the 2 are....for my chip to get to 4.5ghz i must have my cpu-nb at 2600mhz and at 1.31v exactly...any deviation and it will be unstable...so maybe you have to find the sweet spot for your 3.8ghz overclock.

EDIT: yes still increase the ram voltage it may help.
Edited by amd-dude - 3/15/11 at 8:32pm
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post #6 of 33
Thread Starter 
Quote:
Originally Posted by amd-dude View Post
The cpu and cpu-nb speed go hand in hand...i will give u wa personal experience with just how connected the 2 are....for my chip to get to 4.5ghz i must have my cpu-nb at 2600mhz and at 1.31v exactly...any deviation and it will be unstable...so maybe you have to find the sweet spot for your 3.8ghz overclock.

EDIT: yes still increase the ram voltage it may help.
Sweet thanks, got it to boot at 4 GHz at 1.475V CPU and 1.375V CPU/NB. Unfortunately, the 3DMark11 physics test still failed on the third loop, even though wPrime 1024M runs flawlessly several times.

I'm currently testing the physics test to see if it works at lower clock speeds/voltages or whether it's just broken (although I do remember it completing without issues at 3.5GHz).
post #7 of 33
The Thubans normally hit 4ghz-4.3ghz, though it might be your motherboard that is limiting you. Try going one or two more clicks higher with your cpu voltage and see if it still crashes.
    
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post #8 of 33
Thread Starter 
Quote:
Originally Posted by Kokin View Post
The Thubans normally hit 4ghz-4.3ghz, though it might be your motherboard that is limiting you. Try going one or two more clicks higher with your cpu voltage and see if it still crashes.
Yeah, I've gone up to 1.5V (CPU)/1.4V (CPU/NB) and it's still the same issue with the 3DMark11 Physics test crash, even at lower clock speeds (3800MHz).

So for now I'm just going to pretend 3DMark11 doesn't exist and play Starcraft 2 at 4GHz. I'll run an overnight Prime95 test (Small or Blend?) and post the results tomorrow.
post #9 of 33
Thread Starter 
;_;

I got a BSOD (something like this) somewhere between 1 hour and 5 hours of Prime95 (I fell asleep during that time). I've tried voltages up to 1.5 on the CPU and 1.4 on the CPU/NB, but no luck at 4004MHz. I don't want to go any higher, but the temperatures are well within the limits (~53C for the motherboard's CPU sensor, ~44C for each core).
post #10 of 33
Honestly i don't use prime 95 that much again, it takes to long to get errors out of an overclock. I use LINX, it raises the temps higher than what prime does and it usually gets an error before 1 or 2 hrs
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