BCLK Limitation?

[DarthRevan]

Hey guys, why do I get a BSOD (Just after Windows loads) if I set my BCLK over 195?
The PC boots normally.

QPI/VTT @ 1.335
VCore 1.425
Uncore: 3.2
IOH: 1.30
ICH: 1.30
QPI PLL: 130

CPU PLL: Default

Mem @ 2:8
DRAM 1.64v


Core i7 920
Gigabyte UD5
OCZ Platinum 3x2 GB DDR3 1600Mhz

PLEASEEEEEEEEE HELP I WANT BCLK BETWEEN 200 AND 210 !

 

[imported_Shaq]

I don't know if you're at the limit of the board, but it has been found that if you increase PCI-E frequency you can raise the BCLK. You only have to raise PCI-E to 103-105 and it will allow you to go up 5-7 BCLK or so. You can try that and if it works then you are at the normal limit of the board. I can't quite get to 195 with my CPU. Although I may test some more. I'll let you know if I do.

 

[DarthRevan]

But if I get BSOD it´s the Mobo´s problem? Cus at BCLK 196 it loads windows, but when the programs are loading it shuts down. BCLK 195 I could play Crysis for 30 minutes, but after 2 minutes of OCCT it shuts down. I was able to boot with BCLK of 200 one day, but not to the Windows.

If I increase the PCI-E Frequency, what will happen to the video card?

 

[imported_Shaq]

You don't increase the frequency enough to harm the video card. 105-108 tops. That is less than 10% increase. I just suggested to try it and see if it helps. Increase it and see if you can run OCCT longer than before. To get around 210 BCLK and up you have to get the EVGA Classified as it OC's better. It is $400 though and not worth it to me for a 10% increase in speed. I am tempted to try this myself as I have trouble going over 191 and it could be the motherboard and not the CPU. I figured it was too low to be the motherboard though.

 

[DarthRevan]

But I think that when the PC boots and the OS gets error it´s not the MoBo´s problem, but when it doesn´t even boot it´s for sure the MoBo. So what causes the BSOD?

 

[imported_Shaq]

Originally posted by: DarthRevan
But I think that when the PC boots and the OS gets error it´s not the MoBo´s problem, but when it doesn´t even boot it´s for sure the MoBo. So what causes the BSOD?

I tried raising my PCI-E frequency to 106 and it wouldn't boot...strange. Maybe because I have SLI. Things aren't that simple when OC'ing. You have to change things and try them. Did you lower your multiplier to 19 and try to go higher than 195? If it won't go higher with the lower multi then it is most likely the board limit.

 

[DarthRevan]

Tried PCI-E clock to 104 and it didn´t boot neither. No SLI here.

Hey, if the PC boots but the OS fails it is still the MoBo´s limitation?

 

[Shmee]

I am at 19x200, or 3.8 Ghz. Odd thing is, when I try 20x190, I get bsod's in stress testing. I tried 19x210, but no luck, instead the system wont post and it goes through a recovery where it loads default settings on my UD5. HT is off, so is turbo, using F6 bios.

 

[imported_Shaq]

There is a BCLK hole. I have heard other people having them. Did you try going over 190x20? It might work at 200x20.

Darth: It is possible. Have you tried more CPU voltage to see if it will be stable? You are already at 1.42 so I would just try a little higher. 1.45 is max. Is CPU PLL already 1.88? I guess you have a C0?

 

[DarthRevan]

C0 here. I´ve clreared my CMOS after the PCI-E thing, and instead of changing all the voltages (like CPU PLL) I just changed the Vcore, DRAM and the BCLK, now I have 3.6 GHz... What do you guys suggest me?

 

[imported_Shaq]

Up CPU PLL to 1.88v. I can boot windows down to 1.8 but stress tests crash in 30 seconds if not on 1.88, particularly Linx (Linpack). You need to drop your multiplier to 19, or even 18, and see if you can go higher than 195 as that is the best test to find your motherboard limit.

 

[DarthRevan]

Can CPU PLL be over 1.88v?

 

[aigomorla]

Originally posted by: DarthRevan
Hey guys, why do I get a BSOD (Just after Windows loads) if I set my BCLK over 195?
The PC boots normally.

QPI/VTT @ 1.335
VCore 1.425
Uncore: 3.2
IOH: 1.30
ICH: 1.30
QPI PLL: 130

CPU PLL: Default

Mem @ 2:8
DRAM 1.64v


Core i7 920
Gigabyte UD5
OCZ Platinum 3x2 GB DDR3 1600Mhz

PLEASEEEEEEEEE HELP I WANT BCLK BETWEEN 200 AND 210 !

were not gonna tell u what to do.

but i bolded where you should take a better focus on.

Originally posted by: DarthRevan
Can CPU PLL be over 1.88v?

Mine is at 1.88 but im at a much lower bclk.

 

[imported_Shaq]

Originally posted by: DarthRevan
Can CPU PLL be over 1.88v?

1.89v is the limit set by Intel and is still within spec. I have to run it at 1.88v to keep it stable. 1.35v is limit for QPI. 1.55v for CPU.

 

[DarthRevan]

Is it safe to keep them all in their max?

And could you please tell me which setting does what? Cus that´s not how I like to do things, maybe if I could understand each setting i´d become a much better overclocker.

 

[imported_Shaq]

Originally posted by: DarthRevan
Is it safe to keep them all in their max?

And could you please tell me which setting does what? Cus that´s not how I like to do things, maybe if I could understand each setting i´d become a much better overclocker.

It is so far. lol You have to adjust a setting at a time and see what you need to keep it stable. Then you decide what settings you feel okay using. It is easiest to up the voltages close to max spec and see how high you can OC then start lowering voltages one at a time to see the lowest you need. Most people don't do that though. They increase clock speed at default voltage and then keep adding voltage to keep it stable while they increase clocks. It really depends on your temps. 100C is max temp and I would keep it to 90C or less under Linpack. Every other program you use would then be at 70C or less.

I couldn't tell you what CPU PLL is to be honest. Phase Lock Loop? QPI voltage is the new bus voltage where you used to have FSB voltage. I only adjust CPU PLL, DRAM, CPU, and QPI voltages. I leave the rest at auto. Some people adjust IOH, ICH and even the skews. Xtremesystems is the place to learn about those.

 

[aigomorla]

The reason why i am saying we wont tell you want to do is because if something was to go wrong, you wouldnt know why.

This is the most dangerous part in overclocking is not knowing why.

But heres another clue, your gonna need more voltage, expecially more then what the base safe line is because first off the blck you want is not what intel considers "safe".

but if you give too much voltage, you risk something called voltage migration which kills cpu's.

So you need to do some research on this forum, and others on how to safely overclock one.

:T

Lastly, if your cpu is a C0/C1 i7 920, and not a D0, your only gonna get that blck on 19x.

21x x 200 is asking for too much on a non D0.

 

[DarthRevan]

O gosh why does a Co doesn´t like 2xx? So how the heck do I see people with C0 at 4.4 Ghz?

 

[imported_Shaq]

Originally posted by: DarthRevan
O gosh why does a Co doesn´t like 2xx? So how the heck do I see people with C0 at 4.4 Ghz?

Those are usually D0. If they are C0 it could be just for benching SuperPi or 3DMark and probably using Water cooling or better.

I dropped my multi to 19 and was able to bench at 192 but when I tried 200 it rebooted even at 1.5v for CPU and 1.32v qpi. I'm thinking that 3.8 is the limit of this chip or qpi needs to be 1.35v or more and I don't want to try that. I'd like to keep it within specs since I run these clocks all the time.

 

[aigomorla]

Qpi needs to be at least 1.4-1.42

VTT should be roughly around 1.4 which is higher then 1.375 thats recomended.

You need about 1.3-1.35V on your IOH.

Vcore should be at around 1.3875-1.4 after vdroop.

Also make sure you set your Mt/s ratio properly, and set your QPI multi at the lowest possible. Post 200QPI is very tough, and very few boards handle it nicely...

Darth b4 u start going to plugin values.... your C0/C1 will not do higher then 4.2 and thats if you have awesome cooling and a very nice chip with a very nice board.

Also know what those voltage are specifically repsonsible for b4 you plug them in.

Im giving shaq some footings because he seems to know whats he's doing.

 

[DarthRevan]

Just got back from BIOS, i´ll let it at BCLK 160 with 10x mult (to match my RAM´s spec). That´s because i´ll get a new cooler soon (stock sux). I´ll get the Megahalem, what do you guys think?

 

[Shmee]

Originally posted by: aigomorla
The reason why i am saying we wont tell you want to do is because if something was to go wrong, you wouldnt know why.

This is the most dangerous part in overclocking is not knowing why.

But heres another clue, your gonna need more voltage, expecially more then what the base safe line is because first off the blck you want is not what intel considers "safe".

but if you give too much voltage, you risk something called voltage migration which kills cpu's.

So you need to do some research on this forum, and others on how to safely overclock one.

:T

Lastly, if your cpu is a C0/C1 i7 920, and not a D0, your only gonna get that blck on 19x.

21x x 200 is asking for too much on a non D0.

Ah, so that explains my trouble getting above 3.8 Ghz, even with low temps. I also found the need to up Qpi past recommended, and vcore seems needy too. I may want to find a way to trade it in for a D0, if possible. This is really the suck, was hoping to break 4.2 Ghz or more, guess not on most C0's.

The worst part is my temps are so low, so I know I would go sky high with a better chip :C

I wonder if I could sell my C0 to someone who doesnt care about OCing, or at least not super extreme ones...

 

[imported_Shaq]

Originally posted by: Shmee

Originally posted by: aigomorla
The reason why i am saying we wont tell you want to do is because if something was to go wrong, you wouldnt know why.

This is the most dangerous part in overclocking is not knowing why.

But heres another clue, your gonna need more voltage, expecially more then what the base safe line is because first off the blck you want is not what intel considers "safe".

but if you give too much voltage, you risk something called voltage migration which kills cpu's.

So you need to do some research on this forum, and others on how to safely overclock one.

:T

Lastly, if your cpu is a C0/C1 i7 920, and not a D0, your only gonna get that blck on 19x.

21x x 200 is asking for too much on a non D0.

Ah, so that explains my trouble getting above 3.8 Ghz, even with low temps. I also found the need to up Qpi past recommended, and vcore seems needy too. I may want to find a way to trade it in for a D0, if possible. This is really the suck, was hoping to break 4.2 Ghz or more, guess not on most C0's.

The worst part is my temps are so low, so I know I would go sky high with a better chip :C

I wonder if I could sell my C0 to someone who doesnt care about OCing, or at least not super extreme ones...

Have you tried Linpack? That probably explains your low temps. lol I hit 86C at 4.0 including turbo. I have read that some people need a qpi of 1.6v at least to reach 210. That is more than I want to use especially since I am at my cooling limit anyway. Prime blend only hits about 73C but that isn't good enough to test stability. I'm OC'ing my ram now. Up to 1520 with 1333 spec'd ram. Now I am going to try tighter timings and lower voltage.

Darth: You have been using the stock cooler to reach 195? Maybe your CPU is throttling due to heat? Any aftermarket cooler is better than stock. I chose the Ultima 90 because it is one of the smallest coolers and performs very well. Some motherboards and cases may not fit a large cooler. But I have a measly midtower right now. lol

Aigomorla: Does QPI voltage primarily affect CPU or motherboard? It seems D0's can use lower QPI voltage so I was wondering about that. I had to bump up CPU vcore to 1.456v and QPI to 1.32v for Linpack. I did a full 20 runs this time. I must've only done 10 before. hehe

 

[Shmee]

Originally posted by: Shaq

Originally posted by: Shmee

Originally posted by: aigomorla
The reason why i am saying we wont tell you want to do is because if something was to go wrong, you wouldnt know why.

This is the most dangerous part in overclocking is not knowing why.

But heres another clue, your gonna need more voltage, expecially more then what the base safe line is because first off the blck you want is not what intel considers "safe".

but if you give too much voltage, you risk something called voltage migration which kills cpu's.

So you need to do some research on this forum, and others on how to safely overclock one.

:T

Lastly, if your cpu is a C0/C1 i7 920, and not a D0, your only gonna get that blck on 19x.

21x x 200 is asking for too much on a non D0.

Ah, so that explains my trouble getting above 3.8 Ghz, even with low temps. I also found the need to up Qpi past recommended, and vcore seems needy too. I may want to find a way to trade it in for a D0, if possible. This is really the suck, was hoping to break 4.2 Ghz or more, guess not on most C0's.

The worst part is my temps are so low, so I know I would go sky high with a better chip :C

I wonder if I could sell my C0 to someone who doesnt care about OCing, or at least not super extreme ones...

Have you tried Linpack? That probably explains your low temps. lol I hit 86C at 4.0 including turbo. I have read that some people need a qpi of 1.6v at least to reach 210. That is more than I want to use especially since I am at my cooling limit anyway. Prime blend only hits about 73C but that isn't good enough to test stability. I'm OC'ing my ram now. Up to 1520 with 1333 spec'd ram. Now I am going to try tighter timings and lower voltage.

Darth: You have been using the stock cooler to reach 195? Maybe your CPU is throttling due to heat? Any aftermarket cooler is better than stock. I chose the Ultima 90 because it is one of the smallest coolers and performs very well. Some motherboards and cases may not fit a large cooler. But I have a measly midtower right now. lol

Aigomorla: Does QPI voltage primarily affect CPU or motherboard? It seems D0's can use lower QPI voltage so I was wondering about that. I had to bump up CPU vcore to 1.456v and QPI to 1.32v for Linpack. I did a full 20 runs this time. I must've only done 10 before. hehe

Lucky you with your low QPI VTT. If I remebmer currectly, it also effects uncore.

And yes, I have used linx, I always do for the final stability test. Max temps with linx were under 60 C. That is why I said my temps werent holding me back. It idles under 35 C. It has NEVER gone over 60 C Afaik since I got my new cooler.

 

[DarthRevan]

Yeah, i´ve been using the stock cooler... But my case has 7 fans with a well designed airflow, it help,s but a new cooler é truly needed.

And Shmee those are the cores temps or the CPU temp? And by the way, you were killed by the Sand People, that´s a shame!