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1090T can't get past 4.0Ghz. - Page 2

post #11 of 28
Its showing your vcore at 1.63v thats too high if its reading right. Turn off the turbocore option if you can in your Bios, thats probably whats pushing it up there.
    
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post #12 of 28
Thread Starter 
Turbo core was already disabled in the BIOS, when I looked at the voltage core in HW monitor. Without any load, its at 1.50v (as it should be), but when I start Prime95, it jumps up to 1.63 ?????

This is really weird, does any one know if HW monitor is not showing the right amount or maybe I'm missing something in the BIOS
Edited by thestef - 4/25/11 at 10:28am
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post #13 of 28
LLC stands for Load Line Calibration. It keeps your voltage from dropping under load which can cause instability. Can you post screen shots of your BIOS settings for your overclock if you are still having troubles?
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post #14 of 28
Thread Starter 
Yep, still having trouble.

I don't have this LLC option in the BIOS from what I can tell. I would have to get a camera for the BIOS screen shots (I'll see if I can do that tonight).

I ended up upgrading my BIOS version from 18.0 to 18.2 (AM3+ bios update), I guess its now official that the 890FX chip set will support the new AMD bulldozer FX chips.

Back to topic, my vcore in windows is showing up at 1.5V in cpu-z as well as HWmonitor, but once I put a load on the cpu via Prima95, the voltage spikes to 1.6 to 1.63 ???

What's also weird is that if I don't bump up the cpu core voltage to 1.48/1.50v in the BIOS when over clocking to 4G, Prime 95 will report errors. So I'm starting to doubt the 1.63v being reported by cpu-z and HWmonitor is actualy the right voltage, however I find it weird that it only goes up under load?

Does any one here have an MSI 890FXA-GD65 board with a 1090T/1055T/1100T cpu, that can maybe help me out?
Edited by thestef - 4/26/11 at 5:30am
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post #15 of 28
890FXA-GD-70 here, I've hit the same wall.

I've been experimenting. I'm semi-new to overclocking - one of the nice things about the GD-70 is it seems really nubcake-friendly. I got it overclocked and stable to 4GHz without having to mess with anything but the multiplier.

I also can't seem to push it any higher though - I tried bumping the multiplier up to get to 4.2GHz with 1.42V, but it was wildly unstable (couldn't even get even get speedfan/prime95 up before getting a BSOD). Seems odd to me (remember, nubcake) that the voltage would have to be bumped to 1.5V from 1.375V for an extra 200MHz.

Wish I could be more helpful, but hopefully knowing you're not the only one hitting the 4GHz wall will help.

Temps aren't an issue - the NH-D14 is pretty wonderful with keeping the temps reasonable. The highest it's reached is 45c.
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post #16 of 28
To get my system stable at 4Ghz I have to run my vcore at 1.51. Although, when I do prime95 testing, my voltage drops, not increase. I have my NB at 2600MHz with the CPU/NB voltage at 1.3v I have not had to touch the NB voltage and my computer runs fine.
Anything over 4Ghz is unstable for me as well. Some people are blaming it on my motherboard as it's only a 4pin power connector with a 6 core cpu.
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post #17 of 28
Thread Starter 
Well, I finaly figured things out.

It look like the Vboost is in fact what is causing the vcore of my CPU to go up when it is under load. However I set the vcoret to 1.42v in the BIOS and once in windows running prime95\\under load the Vboost makes the vcore go up to 1.55v / 1.56v. (which I might tweek lower later on)

I did however find out that my CPU is only stable until I reach 3.8Gz, or a multi of 19x, anything higher, such as 19.5x and it is unstable. EVEN if I push or lower the vcore voltage, it makes no difference. Its almost as if AMD or MSI set the max core multiplier at 19x, anything above is not stable...

Here is the interesting part however, I can OC this system on stock vcore voltage all the way up to 3.8Ghz (I'm assuming was\\is because of Vboost).

Now, I increased the Bus speed from 200Mhz to 205Mhz (3.9Ghs) and ran Prime95 for 45 minutes wihout any errors.

My next step is to push the Bus speed until I hit the next wall.... then I'll obviously have to stop.

I'm assuming by increasing the BUS speed I will need to increaset the NB and CPU-NB voltage higher... can any one comment on the highest\\safest NB and CPU-NB voltage on my board? and if I will need to increase any other voltage regulator in the BIOS for this?


Thanks for every ones help. +1 rep for every one!

Edit: I forgot to ask, should I watch the NB temps in HWMonitor? I'm assuming its called TMPIM0, TMPIM1 and TMPIM2 ???
Edited by thestef - 4/26/11 at 4:04pm
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post #18 of 28
Thread Starter 
We'll... I spoke to quickly, I pushed the FSB to 210Mhz (almost 4Ghz) and I started getting errors in Prime95. My ram is rated 1600Mhz, but I realize this pushed the RAM speed to almost 1700Mhz ??


Any idea's or suggestions?

T
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post #19 of 28
Quote:
Originally Posted by thestef View Post
We'll... I spoke to quickly, I pushed the FSB to 210Mhz (almost 4Ghz) and I started getting errors in Prime95. My ram is rated 1600Mhz, but I realize this pushed the RAM speed to almost 1700Mhz ??


Any idea's or suggestions?

T
Try to lower the RAM multiplier. I know my RAM is awful with overclocking - I tried bumping up the FSB slightly, causing the RAM to OC by 80MHz - windows could not boot. I'm sure if I dedicated myself to it, I could probably set the RAM at a higher clock, but it would require too much fiddling, and above 1600MHz there will be other bottlenecks in my system.
Edited by cplcoke - 4/26/11 at 4:16pm
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post #20 of 28
Thread Starter 
Are all of you guys at 4.0ghz fully stable when running Prime95?

The reason I ask is because I was initially able to run a few 3dMark Vantage bench marks without any issues at 4.0Ghz even at 4.2Ghz, however if I run Prime95 I get hardware calculation errors.

I lowered my RAM speeds, from 1600Mhz to 1400Mhz and I still got error in Prime95 when Oc'ing my chip past 3.8Ghz to 3.9Ghz.... so I don't think the RAM is at fault. However my RAM Voltage manufacturer spec is 1.35v and my BIOS is auto detected it at 1.50, and I increased it to 1.55 thinking that might be the problem. I wonder if to much ram voltage would cause it to be unstable.

Any way’s, I had to bump down my OC to 3.8Ghz to get Prime95 to run without any errors for aprox 1 hour. I think I'm also stuck leaving the CPU voltage at 1.55v, (1.42 BIOS) (1.55v under load)/(Vboost). I guess it’s not so bad since if the CPU isn't under load the voltage stays at1.42.

I have this weird feeling that I can’t get past 3.8Ghz stable in Prime95 because of this board or the Vboost option that I can’t disable in the BIOS.

Like I asked initially are all of you guys really stable on Prime95 at 4Ghz? or are you only fully stable within games and bench market software ?
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