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Overclocking my Q8400 on my GA-EP45T-USB3P - Page 3

post #21 of 32
Quote:
Originally Posted by btgrant;12225774 
How would I drop the multiplier on the RAM? Do you mean the timings or am I on a different page than you?

System memory multis take your fsb*these multis to get ram speed. Some multis work better than others.

g0003.jpg
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post #22 of 32
Quote:
Originally Posted by Gnomepatrol;12227259 
System memory multis take your fsb*these multis to get ram speed. Some multis work better than others.

g0003.jpg

Okay... Wow. I cannot believe the difference that made. My motherboard will post all the way up to 470 now, and it boots into Windows at 460. However, at 460 Prime95 finds errors on the first two cores almost immediately, then on 450 it found the same error after 6 hours and 8 minutes on core0 and 5 hours and 48 minutes on core1. Cores 2&3 are still running and I think they're pretty much stable.
Anyway, the error Prime95 found was "FATAL ERROR: Rounding was 0.5, expected less than 0.4" and I looked around and found that this apparently means my voltage isn't high enough. First, my core voltage is 1.424 according to my MB and CPUz and that's above Intel's range, is that safe as long as my temps don't get too high? (At the moment they haven't gotten above 52C, which is perfectly fine) Second, if this is a voltage problem, what voltages should I look to change if I want to correct it? I would assume there would be something labelled "FSB voltage" but there isn't, does it have another name on Gigabyte boards?
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post #23 of 32
Quote:
Originally Posted by Gnomepatrol;12227259 
System memory multis take your fsb*these multis to get ram speed. Some multis work better than others.

g0003.jpg

Also, thank you very very much for your reply... I never would have looked at the RAM multiplier. wheee.gif
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post #24 of 32
Yea, one of the most common mistakes in overclocking is running RAM over spec and thinking it's a CPU failure. New overclockers do it almost every time.

Over 1.4VCore is getting high for 45nm. Also, be very careful with that VTT. at 1.4 and over, there have been reports of killing chips. As in, DEAD CPU. I'd bring that down if I were you.

Lets see your other voltages, like MCH Reference. I had to raise my MCH ref to get higher FSB stable.
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post #25 of 32
Quote:
Originally Posted by 2thAche;12234906 
Yea, one of the most common mistakes in overclocking is running RAM over spec and thinking it's a CPU failure. New overclockers do it almost every time.

Over 1.4VCore is getting high for 45nm. Also, be very careful with that VTT. at 1.4 and over, there have been reports of killing chips. As in, DEAD CPU. I'd bring that down if I were you.

Lets see your other voltages, like MCH Reference. I had to raise my MCH ref to get higher FSB stable.

Alright, I was looking around on the internet, and I found this:

http://forums.tweaktown.com/gigabyte/40805-775-quads-duals-hi-fsb-ep-45-ud3.html

Of course, since I'm using DDR3 I had to change my RAM stuff a bit:

MCH/ICH
MCH/DRAM Ref…….........................: 0.850v

DRAM
DRAM Voltage ……..........................: 1.7V
DRAM Termination ……....................: 0.850V (I figured this and the MCH/DRAM Ref should be the same)
Channel A Reference…....................: 0.810v
Channel B Reference…....................: 0.810v

So, I changed my voltages and RAM timings to be the same as the ones he posted (Except, the stuff that said (Auto) next to it, I left alone). Now my computer will post at 500 on the FSB, but Windows will blue screen before I even log in. So I put it down to 480, and there were no immediate errors in Prime95 (which is rather exciting) so that's still running right now.

I wasn't shooting for 4GHz before but now it actually seems like a possibilty and I sort of want to try... Do you think if I increase my MCH Ref it will improve stability? What is a reasonable limit for that? And, are there any other voltages I should look at?
Oh, and what is VTT, I'm assuming that's CPU Termination, right?
Edited by btgrant - 2/2/11 at 11:09am
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post #26 of 32
You can also lower the MCH reference, I had to for stability @ 3.5.

At this point it's basically trial an error and can take quite some time to get completely stable. Also make sure you have power saving functions like C1and EIST disabled. I'd recommend using EasyTune6 if you haven't installed it already to find the sweat spot with voltages, more MCH or CPU Term isn't necessarily better.
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post #27 of 32
I tried lowering MCH reference but my PC wouldn't boot when I tried so I'm thinking that's not an option... But it's no big deal I have zero problems with my temperatures and everything feels pretty stable.

Right now I'm running at 3.92GHz and, like I said, everything feels pretty solid. Tomorrow while I'm out I'll run Prime95 for a good 8 or 9 hours and pray there are no errors. Not sure if I should be content here (because this is a much nicer overclock than I expected) or if I should try and push that extra 10MHz on my bus... headscratch.gif
Anyhow, here are my voltages:

MB Intelligent Tweaker(M.I.T.)
Robust Graphics Booster ...............: Fast
CPU Clock Ratio ..........................: 8x
CPU Frequency ...........................: 3.92Ghz (490x8)


Clock Chip Control
Standard Clock Control
CPU Host Clock Control..................: [Enabled]
CPU Host Frequency (Mhz) ............: 490 Mhz
PCI Express Frequency (Mhz) .........: 100
C.I.A.2 .................................:[Disabled]


Advanced Clock Control [Press Enter]
CPU Clock Drive.........................: <<< 800mV
PCI Express Clock Drive.................: <<< 700mV
CPU Clock Skew (ps).....................: <<< 0ps
MCH Clock Skew (ps).....................: <<< 50ps


DRAM Performance Control
Performance Enhance...................: [TURBO]
(G)MCH Frequency Latch...............: [Auto]
System Memory Multiplier ..............: 2:66D
Memory Frequency (Mhz) ..............: 1306.6
DRAM Timing Selectable ................: [Manual]

Standard Timing Control
CAS Latency Time..............................7
tRCD ...............................................7
tRP'..................................................7
tRAS................................................20

Advanced Timing Control
tRRD............................................... [Auto]
tWTR.............................................. [Auto]
tWR............................................... [Auto]
tRFC............................................... [Auto]
tRTP.............................................. [Auto]
Command Rate (CMD) ........................ [Auto]

Channel A Timing Settings
Static tRead Value.........................: 9
tRD Phase0 Adjustment...................: Auto
tRD Phase1 Adjustment...................: Auto
tRD Phase2 Adjustment ..................: Auto
tRD Phase3 Adjustment...................: Auto

Trd2rd(Different Rank)....................: Auto
Twr2wr(Different Rank)...................: Auto
Twr2rd(Different Rank)...................: Auto
Trd2wr(Same/Diff Rank)..................: Auto

Dimm1 Clock Skew Control...............:Auto
Dimm2 Clock Skew Control...............:Auto
DDR Write Training.........................:Auto

Channel A Driving Strength Profiles
Driving Strength ................... Auto


Channel B
Static tRead Value.........................: 9
tRD Phase0 Adjustment...................: Auto
tRD Phase1 Adjustment...................: Auto
tRD Phase2 Adjustment ..................: Auto
tRD Phase3 Adjustment...................: Auto

Trd2rd(Different Rank)....................: Auto
Twr2wr(Different Rank)...................: Auto
Twr2rd(Different Rank)...................: Auto
Trd2wr(Same/Diff Rank)..................: Auto

Dimm1 Clock Skew Control...............:Auto
Dimm2 Clock Skew Control...............:Auto
DDR Write Training.........................:Auto

Channel B Driving Strength Profiles
Driving Strength ................... Auto

Motherboard Voltage Control
CPU
Load-Line Calibration.....................: Enabled
CPU Vcore….……….........................: 1.39375v(1.36V max cpuz)
CPU Termination….........................: 1.40v
CPU PLL………………….......................: 1.59v
CPU Referen.………….......................: 0.886v

MCH/ICH
MCH Core…………….........................: 1.42v
MCH Reference……........................: 0.886v
MCH/DRAM Ref…….........................: 0.850v
ICH I/O……...................................: 1.57v
ICH Core…….................................: 1.10v

DRAM
DRAM Voltage ……..........................: 1.700V
DRAM Termination ……....................: 0.850V
Channel A Reference…....................: 0.750v [Auto] (for both)
Channel B Reference…....................: 0.750v [Auto] (for both)

Advanced Settings
Limit CPUID Max. to 3.....................: [Disabled]
No-Execute Memory Protect............: [Enabled]
CPU Enhanced Halt (C1E)................: [Disabled]
CPU Thermal Monitor 2(TM2) ...........: [Enabled]
CPU EIST Function.........................: [Disabled]
Virtualization Technology................: [Enabled]
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post #28 of 32
Yeah probably the max voltage i would go possibly 1 more bump for 24/7 might be able to hit 4.0 seems like you have a capable chip just keep watching those temps.

Also, if your mobo is getting a bit warm consider taking off the face-plates on the vrm and nb heat-sinks will drop your temps 5-10C no joke.
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post #29 of 32
Quote:
Originally Posted by Gnomepatrol;12243068 
Yeah probably the max voltage i would go possibly 1 more bump for 24/7 might be able to hit 4.0 seems like you have a capable chip just keep watching those temps.

Also, if your mobo is getting a bit warm consider taking off the face-plates on the vrm and nb heat-sinks will drop your temps 5-10C no joke.

Well, it's been running Prime95 for almost 12 hours now, no errors, and at this very moment, my CPU temps are hovering around 46C, my RAM is at 43C and my MB is at 31C... You know what? I just decided I love my coolers biggrin.gif
So yeah, Prime95 12 hours stable... I think it's high time to shoot for 4GHz. I'll post back when I have some results cool.gif
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post #30 of 32
One quick question... I noticed when I overclocked to 4GHz, CPUz read a change in my core voltage to 1.376... I know the max for this proc is supposed to be 1.3625v so I was wondering, is it safe to keep it this way? Or will it significantly shorten my processors life?
I'm just a bit wary to change it because I don't want to lose my overclock.
Thanks in advance for your replies.
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