help with an Opteron OC

[nib95]

basically my opty 170 is giving me errors on prime95 after about 2 hours.
It's currently at 2.6ghz with idle at about 32 degrees and load at 45.

This is my set up.

Test bed: (same as sig)
DFI LP NF4 Expert SLI
Opteron 170
SLI 7900 GT
Enermax 500w Liberty
Big Typhoon

FSB - 260
LDT/FSB ratio - 4x
Multiplier - 10x

Command Per Clock Enable
TCL-3.0
TRCD-4
TRAS-08
TRP-3
TRC-7
tRFC-16
TRRD-02
tWR-03
tWTR-02
TRWT-04
tREF-0780
tWCL-01
DRAM Bank Interleave-enabled
DQS Skew Control - auto
DQS Skew Value- auto
DRAM Drive Strength - Level 7
DRAM Data Drive Strength - Level 3
Max Async Latency- 8ns
DRAM Response Time - Fast
Read preamble Time- 5ns
Idle Cycle Limit- 32clks
Dyanamic Counter - Enable
r/w Queue bypass: 16X
Bypass Max - 07X
32 Byte Granularity - Disable (4 bursts)
Vdimm-2.67v

Do you guys think I should try a LDT/FSB of 3x, or is that too low?
Changing volts on the memory makes things worse, and upping the voltage on the CPU hasnt really helped either.
Any ideas?

Also, does upping the voltage of the LDT help?
Should I try 1.3? It's currently at 1.2v.

 

[Jen]

LDT/FSB ratio - 4x

set that to 3

then try it

hugs


Jen

 

[nib95]

I'm being crazy, I'm going for 2.7ghz, temps are the same.
But I'm now trying 270fsb with my LDT/FSB at 3x and ram divider at 183mhz.

So far it's ran Prime95 15 mins perfect

 

[nib95]

Ok that test failed after 20 mins lol.

Now gonna try the same but with a 166 divider.

 

[nib95]

Ok that didnt work.

A guy over at DFI street says that my FSB x my LDT/FSB x2 again must equate to around 1000. (in reality 2000 but thats more maths)
dropping it to 3x gives me 780 which is quite a bit lower.

jen I'll try what you said with the 3x LDT/FSB.


But if that doesnt work I'm going to try 300fsb 9x multi, 3x LDT/FSB and a 166 memory divider.

 

[Jen]

Originally posted by: nib95
Ok that didnt work.

A guy over at DFI street says that my FSB x my LDT/FSB x2 again must equate to around 1000. (in reality 2000 but thats more maths)
dropping it to 3x gives me 780 which is quite a bit lower.

jen I'll try what you said with the 3x LDT/FSB.


But if that doesnt work I'm going to try 300fsb 9x multi, 3x LDT/FSB and a 166 memory divider.

make certain your memory can do speed

also may have to add voltage to the nb , sb depends on board

use 3x at higher than 250 fsb . if lower than 250 use 4x

you will find the dfi is sometimes difficult to set especially with memory settings.


hugs

Jenette

 

[nib95]

Originally posted by: Jen

Originally posted by: nib95
Ok that didnt work.

A guy over at DFI street says that my FSB x my LDT/FSB x2 again must equate to around 1000. (in reality 2000 but thats more maths)
dropping it to 3x gives me 780 which is quite a bit lower.

jen I'll try what you said with the 3x LDT/FSB.


But if that doesnt work I'm going to try 300fsb 9x multi, 3x LDT/FSB and a 166 memory divider.

make certain your memory can do speed

also may have to add voltage to the nb , sb depends on board

use 3x at higher than 250 fsb . if lower than 250 use 4x

you will find the dfi is sometimes difficult to set especially with memory settings.


hugs

Jenette

I really appreciate your help jen.

Here's the latest:

Guys, I have to report another issue.
It seems my OC is not stable after all *cries*

(config A) basically 270htt x 10 multi with a 9/8 memory divider and 4xLDT/FSB runs all apps and games, 3dmark05/06 etc perfect with no glitches. BUT, fails horribly at running Prime95 at anything more then 5 mins!

Upping to voltages slowly helps add about 5 mins each time, so far I'm up to 1.45v but I really dont want to go further then this, as I begin to go closer to 50 degree load temps. (at about 1.475-1.5v). Right now at 1.45 they are a nice and manageable 46 degrees. Sometimes 44 or 42.

My other config (B), 300htt x 9 multi with a 6/5 memory divider and 3xLDT/FSB runs Prime95 stable for 6+ hours easy. And temps dont go above 50 degrees on 1.5v (havent tried 1.475v yet). However, at this OC I cannot get 3dMark06 to run properly without lock ups


Man oh man OC'ing is a tough business.
What I'm going to try next is 1.475v on config A or perhaps a bigger memory divider. but I really shouldnt need one with this kind of ram! I know it can definately do 250htt problem free. If that still doesnt do prime95 stable, I'll try config B but with my Drive strength setting at 1 instead of 3.
3 seems to give me issues at a 1T rate.

Anyone have any helpful tips?
One I get 2.7ghz to run I may even try for 2.8ghz.
I think it can be done, temps are always pretty good.
I'm sure its just all in my settings.

Anyone have similar ram and could post memory set ups I could try?
Maybe I should try a 2T command rate and/or looser timings?

Stepping is UMPW which I hear is one of the best.

Jen I'm going to try what you said, and drop the LDT/FSB to 3x on config A.
See if that helps.

 

[JSFLY]

yeh try 2t timings

You can also play around with your vcore. ie: 1.4 volts X 1.04% etc etc. Sometimes that'll help.

Also 1.5 vcore shouldnt be too much of a problem for your big typhoon. 50C load isnt too much to worry about.