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E8400 + UD3 hates +4.25Ghz - Page 2

post #11 of 33
Thread Starter 
I actually posted in there a few days ago and read a bunch of the UD3P/R thread. :/
    
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post #12 of 33
Thread Starter 
Tried Static tRead/Performance level at 10, no change.
    
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post #13 of 33
I remember seeing multiplier issues being discussed on xtremesystems awhile ago. But I don't recall if it was in the UD3P or the P5Q threads.
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post #14 of 33
Try upping the CPU Clock skew. Try 200.
    
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post #15 of 33
Thread Starter 
Thanks, I will try to read some threads @ extremesystems.

No luck with 200 on the CPU clock skew. Still errors Prime small immediately on one core.
    
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post #16 of 33
First thing I would do is load optimized defaults in the advanced clock control menu. You have the menu set to fail-safe mode. This will increase CPU clock drive and PCI express clock drive a couple of settings each. Not sure what the difference really is, but I always use optimized defaults in that menu, then adjust the skews.

Have you tried to undervolt the MCH ref? Try .72 or .74 MCH ref with FSB term at 1.2, and let it scale up as you increase FSB term.

I also need 50-100PS NB skew for 500+ FSB.
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post #17 of 33
Quote:
Originally Posted by Blacklac View Post

I had 4.2Ghz stable on my EP35-DS3 also. I expected to get alot more out of this board. :/

I know my vCore is a bit high there, but my chip really needs 1.38-1.4v around 4Ghz. I dont have a magic chip that is 4Ghz stable off 1.3vcore. It's an E0 1.25VID too. Maybe because its an ES (Engineer Sample) its wonky.

Yep, you know deep inside the answer to your own question. It's not the motherboard; it's the CPU.

The Core 2 Duo and Quad 45nm normally scale well up to 4 Ghz, but from there on it's no longer linear; you have to increase the voltage more for a minimal increase in clockspeed. You can read the Core 2 Quad QX9650 review over at Anandtech to get an idea.

You can get lucky and get an excellent chip, or in your case you get a little less lucky and get a very good chip.
Edited by tpi2007 - 4/16/11 at 3:35pm
 
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post #18 of 33
Quote:
Originally Posted by tpi2007 View Post
Yep, you know deep inside the answer to your own question. It's not the motherboard; it's the CPU.

The Core 2 Duo e Quad 45nm normally scale well up to 4 Ghz, but from there on it's no longer linear; you have to increase the voltage more for a minimal increase in clockspeed. You can read the Core 2 Quad QX9650 review over at Anandtech to get an idea.

You can get lucky and get an excellent chip, or in your case you geta little less lucky and get a very good chip.
This^
    
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post #19 of 33
Thread Starter 
Yes, that is what I feared. Lol. I just hoped there was something I overlooked.

I have tried various Ref settings, always setting VVT back at 1.2v and then adjusting. My current setting seems to be within the stable range.

I will try NB Skew.
    
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post #20 of 33
Here is my MIT for 500x9... see if it helps. Also, in the future, you should do this for us to look at instead of posting pics.. they're harder to WANT to look at.

Quote:
CPU = Model E8400
Motherboard = EP45-UD3P Rev. 1.1
BIOS Version = F9
Ram = Gskill PC2-8500 8GB

MB Intelligent Tweaker(M.I.T.)
Robust Graphics Booster ...............: Auto
CPU Clock Ratio .............................: 9
Fine CPU Clock Ratio.....................:
CPU Frequency ...............................: 4500MHz


Clock Chip Control
Standard Clock Control
CPU Host Clock Control....................: [Enabled]
CPU Host Frequency (Mhz) ..............: 500MHz
PCI Express Frequency (Mhz) .........: 100MHz

C.I.A.2 .................................:[Disabled]


DRAM Performance Control
Performance Enhance...................: [STANDARD]
Extreme Memory Profile (X.M.P.).....: Disabled
(G)MCH Frequency Latch...............: [Auto]
System Memory Multiplier ..............: 2.00D
Memory Frequency (Mhz) ..............: 1000MHz
DRAM Timing Selectable ................: [Manual]

Standard Timing Control
CAS Latency Time........................: 5
tRCD ..............................................: 5
tRP............................................... ...: 5
tRAS.............................................. .: 15


Advanced Timing Control
tRRD...........................................: 4
tWTR...........................................: 12
tWR.............................................: 4 in BIOS
tRFC...........................................: 55
tRTP...........................................: 4
Command Rate (CMD) ...........: 2


Channel A
Static tRead Value.........................: 9
Channel B
Static tRead Value.........................: 9


Motherboard Voltage Control
CPU
CPU Vcore….……….................................: 1.4
CPU Termination…..... 1.200V*...............: 1.28 - 1.32 I needed 1.32 because I have 8GB RAM
CPU PLL…………………....1.500V*.......: 1.5
CPU Referen.…………....0.755V*...........: .76

MCH/ICH
MCH Core…………….....1.100V...........: 1.30 - 1.32 I needed 1.32 because I have 8GB RAM
MCH Reference….…….0.800V.............: .72
MCH/DRAM Ref.…......0.900V...............:
ICH I/O……………….....1.500V.............: 1.5
ICH Core…………...……1.100V...........: 1.2

DRAM
DRAM Voltage ……....1.800V............: 2.0
DRAM Termination .…0.900V............:
Channel A Reference 0.900V............:
Channel B Reference 0.900V............:
As for skews, I never adjusted any. I think that Noguru only had to start adjusting skews as he was getting north of 533FSB.

Your memory strap doesn't make sense to me either. Why are you using a B strap?
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