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Help OC 1100 T

post #1 of 7
Thread Starter 
I am new to OC and was wanting to see if I did the OC right? 3.9 It is running great no bsod ran P95 for over an hour and the hottest it got was 47 C. All I did was up the multiplier to 19.5, did not touch cpu voltage or nb voltage

post #2 of 7
Looks good, getting to 3.9 is generally pretty easy on a 1100t. Pushing past 4.1 is where it gets hard. 3.9GHZ is a nice speed on stock voltage though, you have a pretty good chip.

What are you trying to reach?
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post #3 of 7
Thread Starter 
Mostly trying to get a stable OC for gaming of at least 3.9 - 4.0. I noticed others having reached 3.9 or higher with lower multiplier settings. Is that because they uped the voltages? If so where would I begin or should I just step the multiplier up one step at a time?
post #4 of 7
You can reach high clocks with a lower multiplier by increasing the bus speed. This is my preferred method for overclocking the 1100T. On mine, I increased the bus to 250 which works well with the multiplier. 250*16= 4GHZ. However, when you increase the bus, you will also overclock the north-bridge, the hyper transport, the ram. You have to lower the multipliers on each of those to get them back into line with the stock clocks.

Try out 250x15.5 first since that will bring you near 3.9 where you are currently stable. Then try increasing the multiplier to 16 and if its no longer stable start bumping up the vcore a little bit. Once you have a stable overclock we will then overclock the north-bridge and you will see a nice increase in FPS in your games on top of the frequency overclock.
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post #5 of 7
Thread Starter 
Dont know what happened but did another Prime95 with the settings I had originally and on the 2nd test core #5 stopped working said Illegal sumout. Went in to bios and put cpu voltage to 1.45 and run P95 and the same thing happened but it didnt even complete 1 test. I put everything back to auto and put multiplier to x19 for a target speed of 3.8 running P95 now everything is fine for now. On auto my CPU VID is 1.375 and the NB VID is 1.15. What can I try to be able to get a stable 4.0?

Papadope I tried increasing bus speed to 250 and x15.5 and it would even post.
post #6 of 7
Your going to need more voltage for 4GHZ, Most Thubans hit a wall around 4-4.2GHZ. Just keep increasing voltage till it's stable. The reason I recommended increasing the bus speed is because i can hit a higher frequency with lower voltage by doing so. Since 1.45 was unstable try 1.475 but keep an eye on the temp. I'm not too familiar with your cooler.

For example on my 1100T
3.8GHZ stable at stock voltage
4.125GHZ stable at 1.4875
4.25GHZ stable at 1.535 -> I cant cool this when ambient room temps are high though so I don't use it (summer).

You can see how it starts increasing pretty drastically with very little increase in the clock past 4GHZ. The max safe voltage is 1.55 so as long as you stay under that and you can cool it your processor will be fine. Also, the max temp of the 1100T is 62c so if you increase your voltage and start getting a blue screen check to make sure you are not overheating with core temp.

As for why you were stable and now your not, that happens just means you were not 100% stable. I ran 4.125Ghz at 1.475v for 8 months with no problem. However, if I do a prolonged stress test or folding I will bluescreen after a few hours. At 1.4875v the bluescreen never occurs.
Quote:
Papadope I tried increasing bus speed to 250 and x15.5 and it would even post.
It's possible your particular processor does not like an increase in the bus speed. However, are you sure you reduced the multipler's on the Northbridge, HyperTransport, and RAM to put them back within spec?
Edited by Papadope - 11/30/13 at 9:48am
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post #7 of 7
Thread Starter 
Ok bumped up the cpu voltage to 1.47 and multiplier to x20 for 4.013.Running P95 core 5 stopped at 12 tests in16 minutes - 0 errors, 100 warnings. Error: Illegal Sumout. Other cores still running fine max temp so far 54 degrees. What does this mean and what should I do? Thanks for the help also. If I start messing with the CPU/NB and the HT Link Speed what should I bump them up too? or would that help?
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