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A journey into overclocking a Thuban 1090T to 4ghz on a 4+1 VRM mobo

post #1 of 17
Thread Starter 
I have a motherboard with 4+1 phase VRM chips and it might not be able to handle it. When I do reach a stable overclock and test it on Prime 95 I noticed 2 things. Prime95 lowers the actual voltage (it's set on 1.5v and it lowers to 1.430-1.450) while testing and even after a while when the temp reaches as high as 65°C it lowers the CPU multiplier to 8x. This might be a ASUS thing to save the VRM chips from burning up but now I have some custom tiny heatsinks on all the MOSFETs and VRMs so It might help.

I want to ask about Hyper Transport Link. I heard something about that if it's above 2000mhz there are slowdowns or even stability issues and somewhere I read about that a bit higher than default of 2ghz it helps in 3D performance and some say that the northbridge and HT link need to be at the same level of frequency for stability reasons. What should I do about HT Link?

I tried a combination of HT Link on 2200mhz and Northbridge of 2600mhz that worked fine but still I wasn't satisfied. Then I tried HT Link 2400 and northbridge 3000mhz and then after reading about the HT Link slowdowns I just Lowered it again to 2200mhz. I had it like this for a bit at 3ghz NB in 1.4v and HTlink at 2.2ghz at 1.340v but I had a BSOD a few times. In a forum I read about a 3000mhz for NB and 3000mhz for HyperTransportLink and that it helped in stability and that he reached 4.2ghz with his 1055T and I tried the same but still in Prime95 it crashes and to him it runned for hours. Is this all because his motherboard has more then just 4+1 vrm chip set? That can handle more?

I want to reach 4Ghz with my AMD Phenom II x6 1090T 125w and be able to set the NB at 3ghz and do whatever it will give me more performance with HT Link.

C1E disabled
Cool&Quiet disabled
Turbo core disabled

My specs are:
ASUS M4A785T-M (785G chip and I have the latest bios)
AMD Phenom II X6 1090T 125w
AMD Sapphire HD7850 2gb
4x 2 Patriot Gseries(AMD Black Edition ready) 1600mhz 9-8-9-24 33(tRC) 2T(CR)

CPU is cooled by Scythe Ninja 3 witch has 1 fan. And the case has 5 fans.. The 2 top ones are blowing the hot air out and the back one is blowing the heat out. The one in the front is blowing in for the HDD and in the side is blowing inside for the GPU and for the Scythe Ninja 3 fan. The VRM chips and MOSFETs have now some custom sawed heatsink from an old ATI Radeon 9200.

Here are some pictures
Case:
http://postimage.org/image/lmz028u7v/
http://postimage.org/image/jtjs5rqot/
http://postimage.org/image/wj99n6rs3/
VRM custom heatsinks:
http://postimage.org/image/3pgnxwjpz/
RAM and HDD cooling: =D
http://postimage.org/image/9akix104l/
http://postimage.org/image/54be7w33r/

Any reply, help is really appriciated =)
Salut from Slovenia

Naik Pahek
post #2 of 17
I've done some testing with super pi and HT speeds and found it does give a small performance increase. But that is just one benchmark so I wouldn't say it's a definite answer. The voltage dropping would be your motherboard and a feature in the bios called LLC (load line calibration) you can mess around with these if you want a more stable voltage. With my 1090T I am running at 50% LLC and with 1.425 in bios I get 1.38v under load.
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post #3 of 17
Thread Starter 
Intresting.. How do I know when its to much? Maybe 2400mhz in HT Link will be enough or maybe with toying aroung with FSB I can get it to 2300mhz. You know maybe 2400mhz is to much.
I toyed around with LLC and the jumps in voltage were still high and the thing its difficult to understand so I left it on auto but I will try with the 50% or more and test it. But I noticed with monitoring the voltage with HW monitor that while playing videogames there are not so big differences. Should I set the voltage on 1.6v to have the CPU stable? Well then again the temperatures would be a problem and the CPU multiplier would drop. frown.gif

Well and what is the frequency you are running on with your 1090t ? 3.4-3.5ghz?
post #4 of 17
Honestly I would just leave the HT link around 2000 - 2100 for daily stuff. I would like to test it with a multi gpu setup, I just don't have two of the same card haha. If you're already reaching 65c you may have to look into better cooling or drop the clock. The phenom II architecture loves cooler temps for stability. Once they start getting over that 60c barrier they tend to become unstable.

I'm running 4ghz with a max temp of 43c at 1.38v and HT link is at 2120. My NB is at 2800 at the moment because I am still testing the chip but I hope to get that around the 3000+ mark. I was running super pi 32m at 3300 NB so it should do it.

I've had other 1090T's that won't go past 3.8 stable. It's all just a luck game unfortunately.
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post #5 of 17
Thread Starter 
Yeah I noticed that. And it's going on my nerves. And it's not the CPU temperatures the problem but the friging VRMs. frown.gif
I will try to mirror your settings and maybe I will be lucky but then again my motherboard sucks. What motherboard do you have?
Sorry for bothering tongue.gif

Edit:
Higher hyper transport link frequency improves bandwith and that can be a advantage for only those who have multiple GPUs?
Edited by NaikJoy - 10/27/12 at 2:36pm
post #6 of 17
I'm using a crosshair formula IV, so it's a pretty beefy board. Using a antec kuhler 920 with the stock fans set to half speed.

It's no brother mate!
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post #7 of 17
Thread Starter 
That's a beast. You have a nice setup. I doubt I will be able to run 4ghz at 1.38v like you do.
Do you think that my 1.5v for 4ghz on 1090t is to much? Should I drop it a little?

=) Thanks that it dosent bother you
post #8 of 17
Every chip is different man. I've had two other 1090T's that could not go beyond 3.8 no matter how much voltage I threw at them :/ Keeping them cool is the key, but if the chip can't do it then nothing will change that.
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post #9 of 17
I have an 1100t on a 4+1 asrock extreme 3 990fx and I'm really interested to see what settings could help make it to 4 ghz!
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post #10 of 17
your board looks sturdy for a 4+1, im sure it will handle the 1090T for at least 5 years without problems.

Although I suggest in addition to the small heatsinks,
Put a small 60mm fan to blow on top of them so you can also cool the Chokes (the box thingies beside the mosfet)

Ive been running an unlocked x4 on a 3+1 for a year now and the chokes were the hottest part of the motherboard.
Edited by edalbkrad - 10/27/12 at 2:52pm
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