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High BCLK issues on EVGA FTW3

post #1 of 18
Thread Starter 
Hello. I will forgo an introduction because I am not good at them.

I recently built my first machine ever, a i7 950 D0 based rig, with an EVGA FTW3 mobo, 6GB of XMS3, and a GTX 570, all wrapped up in a HAF X. I can get to 3.8 GHz with 21x181 and it is perfectly stable. Vcore is set at 1.25V with Vdroop, all other volts are at stock. My cooling is a Vantage ALC with the back bracket thing removed and an additional 120mm 46cfm fan put in, for push-pull like a H70. The extra fan runs at 100%, the Vantage controlled one is set to Extreme. I also replaced its thermal pad with some silver based compound. It's sufficient for 3.8GHz; after a while running BOINC, tCase never gets higher than 50 C, and the hottest core gets to about 65. It runs all day without complaint.

I can set it to 23x181 and get 4.152GHz, and that is semi-stable, in that it runs for a while, then BSOD's. Sometimes it has BSODs booting. It does run pretty hot, or at least my idea of hot. 73 C tCase, about 90 for the hottest core. Though, I understand that tjMax is 100C, when the CPU starts to throttle, so I think that's okay, though probably not okay for 24/7. That's also on 1.25V, with all other voltages stock.

I want to run the BCLK at 200MHz, so I can run my memory at what it's spec'd at with a x8 multiplier, to get 1600MHz. Currently, it is at 1450Mhz, with 8-9-8-22-1T timings (though it is rated for 9-9-9-24-2T, it is stable at the lower speed). Even if 4.2GHz ends up being too hot, I can just lower the CPU multiplier and still have the good memory speed at 4.0 or 3.8.

However, if I try to increase BCLK to more than around 180, the whole thing instantly gets unstable. It's unable to run more than a few seconds of Prime95. I tried adjusting various settings and voltages, but I'm not sure what most of them do/what the voltages will affect and what are safe values, because I am new to CPU overclocking. I guess I haven't found the right combination yet.

It is critical that this overclock be stable, because all 4 cores with HT will be maxed out 24/7 with BOINC, and it's also a home server NAS-type sharing thing with its 2TB of storage (I also SSH into it from school with my netbook and use SFTP to transfer files...it dual-boots Linux). Also, I would rather not fry it, because I spent about two grand on it and plan on keeping this thing for a very long time (hence the low volts).

I'm typing on my netbook so I can apply settings in real time. I hope someone can provide assistance.
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RedMatter
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post #2 of 18
It may need a bit more vcore than 1.25V to run 200 bclk, & will likely need more voltage to the qpi/vtt as well. What is the cpu vtt currently set at?
    
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post #3 of 18
Thread Starter 
I tried all kinds of Vcore, I went up to 1.35 and same business. I don't really want to go above Intel's spec, 1.375. CPU VTT is at stock, 1.2.
RedMatter
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RedMatter
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post #4 of 18
Try 1.4v

my old 950, like urs did 3.8 no problem.. but for 4-4.2ghz i needed loads of voltage which made me change it in 2 weeks
post #5 of 18
Thread Starter 

Wait, change it in two weeks as in it died? Or you just didn't like it?

I've seen people get to 4GHz with this chip and even the 920 so easily. That well-known i7 Overclocking Guide for Beginners things does it, as well as this video

in which the guy even has my same motherboard! He is using that
Noctua D14 cooler though, which seems to be the cooler to have, but it's so damn huge!

Maybe I got a wonky or inefficient chip, or maybe the power supply isn't up to snuff. It's an Antec Quattro 1000W, which I heard are kinda meh quality.

I'm starting to wonder if those few more hundred megahertz on the CPU and memory are even worth it. Also I feel kinda silly for being so impatient as to buy a 1366 board and processor for a new build, when literally a week later Sandy Bridge comes out with an unlocked multiplier processor, the 2600K. Oh well...

EDIT: Whoops, didn't mean to embed it. E2: Well, seems if I put up a YouTube video here, I don't have a choice to embed it or not...hm.
Edited by ThatBum - 2/3/11 at 2:53pm
RedMatter
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RedMatter
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post #6 of 18
Yes I sold it and bought a Sandy Bridge. I know ppl reach 4ghz easily.. I myself reached 4ghz on a 930 and my firends 950.. however I couldn't on mine. >.<
post #7 of 18
Thread Starter 
Holy hopping holodecks! Your sig says you have 4.7GHz on the 2600K? Shoot, now I'm really starting to regret getting a 9xx...although, I really don't think I need that much speed, even with BOINCing, for quite a while. It's certainly not a bottleneck while gaming, and things like audio transcoding go plenty fast. Still, it teaches me to be a bit more patient when building something new when a new technology is just around the corner...maybe in a year or so I'll swap out the motherboard and processor when I get the scratch...by then the 6/8 core Sandy's may be out by then and/or Socket 2011 (or whatever they're calling it now). It's just another thing to look out for...hope my 570 is still good by then, and the big N doesn't roll out the 6xx by then...
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RedMatter
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post #8 of 18
its your vtt. It need to go up for sure. I have a i7 970 that I am running at 200 blk right now and it needs the boost because the timing is changed so far. Watch your dram voltage when you start running prime and you will see what I mean. I have found so far that the FTW3 lets the ram V drop a bit so stay on the safe side. Also, Remember to keep your VTT within 0.5V of your dram or bad bad things will happen. Let me know how it works out.
    
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post #9 of 18
Thread Starter 
Which is VTT? I have "CPU VTT Voltage," but this is +0mv, +25mv, etc, and not what I think I'm looking for.

This is what I have it set to now at 21x181:

EVGA Vdroop Control---With VDroop
CPU VCore--------------1.25000V----1.25000V
CPU VTT Voltage--------Auto--------+0mv
CPU PLL Vcore----------Auto---------1.800V
DIMM Voltage-----------Auto---------1.500V
DIMM DQ Vref----------Auto---------+0mv
QPI PLL VCore----------Auto---------1.100V
IOH VCore--------------Auto---------1.100V
IOH/ICH I/O Voltage---Auto---------1.500V
ICH VCore--------------Auto---------1.100V
PWM Frequency--------800KHz------800KHz

What needs adjusting?

E: Also, I may need to change the Uncore clock, to make it twice as fast as the memory. I did tht before too, and it didn't seem to change much in stability.
Edited by ThatBum - 2/3/11 at 3:50pm
RedMatter
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RedMatter
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post #10 of 18
Quote:
Originally Posted by ThatBum View Post
Which is VTT? I have "CPU VTT Voltage," but this is +0mv, +25mv, etc, and not what I think I'm looking for.

This is what I have it set to now at 21x181:

EVGA Vdroop Control---With VDroop
CPU VCore--------------1.25000V----1.25000V
CPU VTT Voltage--------Auto--------+0mv
CPU PLL Vcore----------Auto---------1.800V
DIMM Voltage-----------Auto---------1.500V
DIMM DQ Vref----------Auto---------+0mv
QPI PLL VCore----------Auto---------1.100V
IOH VCore--------------Auto---------1.100V
IOH/ICH I/O Voltage---Auto---------1.500V
ICH VCore--------------Auto---------1.100V
PWM Frequency--------800KHz------800KHz

What needs adjusting?

E: Also, I may need to change the Uncore clock, to make it twice as fast as the memory. I did that before too, and it didn't seem to change much in stability.
Ok so you need to know what your ram settings are and put them there and run a monitoring program while running prime for stability. Also lower your multiplier while pushing your block so you only have one thing to work on at a time. Then push your multi and bring up your CPU Vcore to get your final clock.

If your ram V is 1.50V then run at your current setting and see what the dimmV your getting is. If you see it drop then you will probably need to add a bit more to stay above your min recommended settings. Also add more dramV if you have more then 1 ram module per channel. MAKE SURE YOU KEEP YOUR DRAM AND CPU VTT WITHIN 0.5V OF EACH OTHER OR YOU WILL CAUSE DAMAGE!!!!!!

Your CPU VTT is what controls all of your mem and is why you are crashing in my opinion. Bring it up by +25mv each time to try to start. If you get XXXXX12(4 or 5) BSOD it means you need more VTT. If you get XXXXX101 then that needs more Vcore.

I bring up my QPI PLL about half of my VTT to balance it out because that helps out the VTT.

Yes uncore NEEDS to be 2X what your ram speed is.

PWM you might want to bump up a step to give yourself a cleaner power.

I got 201 blk right now and I want to push my Multi up to 25 on my i7 970 but I don't think its going to happen so I'm now aiming for a 23X.

Good luck!

EDIT!

Take off vdroop to get better voltage controls

Also buy once try once...... bla bla bla bla.....
Edited by cait_0523 - 2/3/11 at 5:41pm
    
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