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What do it mean?

post #1 of 13
Thread Starter 
Been building for 10 + years, but I am a noob at OC'ing. Here is my system.

CPU = Core i5 750 2.6GHZ
- OC to 4.2 currently
- VTT is 1.37
Mobo = EVGA P55 SLI
RAM = G. Skill Rip Jaws (12800) 2x2GB at 1600 MHZ
Cooler = Corsair H70
GPU = EVGA GTX 460 x 2
PSU = Rocketfish 1000 watt
Case = CM storm scout -->finding out that I should probably have gotten a full tower for more room. Wife is already pissed enough. :-(

Everything runs fine and temps are good, 25 - 30 idle and 65 - 70 under load.
When running Prime95 it runs well. However, core 3 always stops working after about a minute. It is always the same core. The test does not fail just that one core stops.

Could there not be enough voltage to the VTT? I have never messed with Vcore voltages as I read that you really should not have to for Lynnfield cpus. Should I raise the VCORE voltage or should I up the VTT voltage a little more until stable? Also, what is the max VTT that this CPU can handle?

If anyone could at least point me to the right thread I would be happy.
post #2 of 13
...

Your VTT is too high, I'd set that back to auto and then set your Vcore to around 1.27v and then up it until you have stability.

C
post #3 of 13
QPI is too high for 1600Mhz, i'm using 1.2V here.
And yes, you should manually change the vcore value, it's the most important OC part.
vcore, allows higher frequencies, and i think your pc is missing vcore, cause 4.2Ghz is a good frequency, but needs an extra voltage.
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(13 items)
 
  
CPUMotherboardGraphicsRAM
I7 960 @3.8Ghz 1.16Vcore Asus P6X58D-E SLI GTX470 PNY XLR8 Edition 3 X 2GB Ballistix Tracer 1454Mhz 
Hard DriveOptical DriveOSMonitor
2 X 1TB Barracuda Sata II 32MB Bluray writer Win 7 X64 Ultimate SyncMaster 2232BW 22'' 
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Microsoft wireless 5000 GameXtream 850W NZXT Lexa Black (aluminium) Microsoft wireless 5000 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
I7 960 @3.8Ghz 1.16Vcore Asus P6X58D-E SLI GTX470 PNY XLR8 Edition 3 X 2GB Ballistix Tracer 1454Mhz 
Hard DriveOptical DriveOSMonitor
2 X 1TB Barracuda Sata II 32MB Bluray writer Win 7 X64 Ultimate SyncMaster 2232BW 22'' 
KeyboardPowerCaseMouse
Microsoft wireless 5000 GameXtream 850W NZXT Lexa Black (aluminium) Microsoft wireless 5000 
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by vsmith View Post
QPI is too high for 1600Mhz, i'm using 1.2V here.
And yes, you should manually change the vcore value, it's the most important OC part.
vcore, allows higher frequencies, and i think your pc is missing vcore, cause 4.2Ghz is a good frequency, but needs an extra voltage.


QPI is the same thing as VTT correct? I was thinking that the VTT and the DRAM was the most important part. What I have now is as follows...
VTT = 1.37
DRAM = 1.68
Vcore = Auto

This is fully stabile at 4.0 GHZ(at least I think it is). However, what you are saying is actually to set the VTT to auto and adjust the Vcore until stable???

Also, my RAM is rated at 1600MHZ, so I am not OC'ing that... Yet.

This is interesting and I will try these adjustments ASAP. Out of all of the OC'ing forums out there this one seems to have the best info. That is why I bit the bullet and registered lol.

Thanks. Will post what I can find out ASAP. Any other suggestions?
post #5 of 13
Your ram is too high as well drop that to 1.65

We've said drop your VTT and lower your DRAM voltage. You need to modify your Vcore.
post #6 of 13
Thread Starter 
Quote:
Originally Posted by compuman145 View Post
Your ram is too high as well drop that to 1.65

We've said drop your VTT and lower your DRAM voltage. You need to modify your Vcore.


Got it. I will try this ASAP. Thanks.
post #7 of 13
Thread Starter 
Oh yeah. One more quick question.

What do I do with vdroop? Reading around, it looks like this is designed to drop the vcore voltage when the cpu is under load. Is this correct? That would mean less heat, but I can't imagine that I would want less power...
post #8 of 13
Leave Vdroop well alone, you only need to change that when you're hitting extreme overclocks. I.E 4.4Ghz and higher.

Comps
post #9 of 13
Thread Starter 
Cool. Thought that was the case. Great! Now I am stuck at work until 3am. This sucks!!! Can't wait to try messing with vcore instead of VTT.
post #10 of 13
Thread Starter 
Well, I put the vtt to auto and upped the vcore. I also lowered the DRAM to 1.65. I could not get anywhere near 4.2. I had the vcore all the way up to 1.4 and the DRAM back up to 1.68. Could not even get windows to load.

Tried 4.2 (21x200) and (20x210) could not get stabile.

I finally got it at 4ghz (20x200) no turbo boost. The vtt is auto and the vcore is 1.296..... The DRAM is set to 1.66.

However, when I run P95 the 3rd core still drops out. I am stumped.
I had vcore at auto, vtt at 1.37, and DRAM at 1.68 and this produced a stable clock at 4.0ghz (20x200).

Any ideas? This system can idle at 4.0 with vcore at 1.29 all day. I am going to up it to 1.3 and go the heck to bed. I will check back in the morning.

Also, would speedstep have any effect on what oc I can reach?
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