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Help with Overclocking my 1075T

post #1 of 44
Thread Starter 
Hey guys, I'm looking to try and push my 1075T overclock as hard as it can go... I've had it sit at 3.3 GHz since I've gotten it, but finally games are really pushing this processor so I'm looking to clock it further, especially to free up my 7970 some more. In Crysis 3 the difference between VHQ and just HQ was 1fps min and recording video murdered my framerates, so I'm definitely CPU bound.

Anyway, my chip seems to have good potential if what I'm reading is correct. The stock VID is 1.3v, and I had it stable at this mark testing last night up to 3.5GHz. My methodology has been 1 hour prime tests until I get to the limits of my processor, where I do longer tests to verify full stability.

Also, if I've read right, the goal is to keep the HT Link and CPU-NB close to 2000 MHz while I overclock through the bus, and then to overclock the CPU-NB afterwards, keeping the HT Link around 2000. I've also been keeping memory as close to stock as possible.

So where I've gotten held up is testing 240 bus for 3.6 GHz, I've been getting worker stoppages due to things like illegal sumouts or a rounding error. I started moving up the vcore from 1.3v to 1.32v, and this succeeded at getting my prime test to go from failing almost instantly to lasting up to test 5, while testing 1.32v resulted in just prime not responding.

My question is where to move on from here. Is the answer MOAR VCORE, or should I attempt something else? I'm also curious as I could not find this anywhere.. as I increase the bus speed, will raising the Northbridge voltage be necessary (not the CPU-NB voltage).

Being stable one hour at 3.5 GHz @ 1.3v and then not being close to passing one hour 3.6 GHz @ 1.32v just seems like a big increase in vcore.

Here are my last one-hour stable settings:

233 MHz Bus
3.5 GHz CPU @ 1.3v
2097 MHz CPU-NB and HT Link @ stock volts
1242 MHz Memory @ 8-8-8-20 @ stock volts

My latest failed test settings:

240 MHz Bus
3.6 GHz CPU @ 1.32v
1920 MHz CPU-NB and HT Link @ stock volts
1280 MHz Memory 8-8-8-20 @ stock volts


So should I continue with moar vcore to continue to try and stabilize my one hour test before moving on to 3.7 GHz?


Thanks guys smile.gif
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post #2 of 44
I would try upping the Northbridge Control +0.1v for higher Hyper Ref clock.
But everything looks good to me. Some people like to find CPU-NB speed
limit 1st. But the normally have unlocked chips.

You have the none-Black Edition 1075T?
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post #3 of 44
Thread Starter 
I will try that, thanks.

And yes it's the non BE one.. didn't think BE 1075's existed. So I'm limited to overclocking through the bus.

And a clarification to my first post, the last voltage I tested on vcore was 1.332v.

Testing 1.344v vcore, 1.625v on the Northbridge.
Edited by Talon95 - 2/17/13 at 6:32pm
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post #4 of 44
Thread Starter 
Passed 3.6 GHz, peak temp was 43C. The vcore fluctuated between 1.344 - 1.356v.. is this okay?

Testing 3.7 GHz and an instant worker stoppage, will do some moar vcore and edit/post results.

EDIT: 1.356v - 1.368v fluctuation, Prime stopped responding.. This mirrors my pattern getting 3.6 stable, upping vcore another notch and testing again.

EDIT2: Worker stoppage at 1.368 - 1.38vcore, upping again.

EDIT3: 3.7 GHz passed one hour prime test, vcore fluctuated from 1.38 to 1.392v. Peak temp was 48C.

Will be testing 3.8 GHz tomorrow, still curious about the vcore fluctuations. Everything looking good so far?

If I understand correctly, max recommended 24/7 volt is 1.45v, right? If the scaling between vcore and clock increases continue it looks like 3.8 GHz will be my limit... average OC on air is 3.9 GHz according to hwbot.
Edited by Talon95 - 2/17/13 at 9:27pm
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post #5 of 44
Thread Starter 
Bump.

Haven't tested 3.8 yet, should be able to try tomorrow.
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post #6 of 44
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post #7 of 44
Thread Starter 

I've read this guide and it doesn't address the non-BE CPU's much if at all.

Another skim through and it looks like 1.45v is the safe limit.

I've also read Dolk's guide on Overclockers and it helps a lot but again does not address non-BE processors much. When I look at their 1075T review they actually run both the CPU-NB and HT Link at 2.4 GHz. I've read some conflicting stuff how keeping the HTT at stock is best for Deneb, but for some reason CPU-NB and HTT should stay at the same speed for stability purposes on Thuban.
Edited by Talon95 - 2/18/13 at 7:39pm
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post #8 of 44
Here is a short guide for you on air
1) CPU Voltage 1.55v max
2) CPU-NB voltage 1.50v max
3) CPU temp 62c max
4) CPU-NB speed as higher as you can
5) Keep Memory speed around or below stock speed
6) Keep HT speed around stock speed
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post #9 of 44
Quote:
Originally Posted by Talon95 View Post


I've read this guide and it doesn't address the non-BE CPU's much if at all.

Another skim through and it looks like 1.45v is the safe limit.

I've also read Dolk's guide on Overclockers and it helps a lot but again does not address non-BE processors much. When I look at their 1075T review they actually run both the CPU-NB and HT Link at 2.4 GHz. I've read some conflicting stuff how keeping the HTT at stock is best for Deneb, but for some reason CPU-NB and HTT should stay at the same speed for stability purposes on Thuban.

AH yes, I remember reading this.

http://www.overclock.net/t/307316/offical-overclocking-guide-amd-socket-am2/0_100


THIS is useful for you, this is what taught me the old school way of overclocking in a world of unlocked multipliers that I entered the market in. VERY USEFUL for me given the fact that I never needed to do baseclock adjustments. Cheers thumb.gif
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post #10 of 44
What helped me overclock my locked Thuban was:


Max temp 62c
Max vcore 1.450v (1.475v according to a few people - max turbo is 1.475v listed by AMD)
disable CnQ & C1E (can turn back on when you are happy with you overclocking as it should still work).
keep HT-Link close to stock 2000MHz
raising NB speed and upping NB Voltage Control (lowered CPU core voltage as the IMC has more stable).
underclocked my ram (loose timing) - I save memory for last because with locked multiplier we can't just pick
what speed it runs at. using dividers and tight timing are our only tools.

Looks like you are doing a good job and taking your time.
Seems like you need more vcore.
Quote:
Originally Posted by Talon95 View Post

I will try that, thanks.

And yes it's the non BE one.. didn't think BE 1075's existed. So I'm limited to overclocking through the bus.

And a clarification to my first post, the last voltage I tested on vcore was 1.332v.

Testing 1.344v vcore, 1.625v on the Northbridge.

I hope that was a typo about the NB voltage. 1.625 volt is a lot.

Biostar TA890FXE vcore fluctuated could be due to the 5+1 VRM setup.
It would not hold me back from overclocking. Just something to keep an eye on.
On Liquid Nitrogen they got a 955 to 6,477MHz accoding to HWBot

TA890FXE seems capable of 265-270 MHz HT ref clock.

Phenom II X6 1090T BE @ 3,944MHz (ref/imc/qpi: 232/2,088/2,319MHz) @ 1.452v




The 1055T Owners Club
http://www.overclock.net/t/720502/the-1055t-owners-club

AMD 1075t Overclocking
http://www.overclockers.com/forums/showthread.php?t=664779

AMD Phenom II X6 1075T Review
http://www.overclockersclub.com/reviews/amd_phenom_1075t_970_560_athlon_645_450_265/
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