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DogChainX

3800 x2 w/ DFI Expert board does not OC

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EDIT: I got to 2700MHz, look down a few posts to see what tweaks i did to the BIOS to get there.

 

Ok, I bought into the price reduction hype and am the owner of a brand-new spanking 3800+ x2 CPU. I was excited to get this because I'm usually multitasking quite heavily with Photoshop, Illustrator and a few other programs. However, I "upgraded" from an Opteron 146 running at 2900Mhz to this that won't overclock past 2400Mhz. Help? :confused:

 

I have read the OC guide through and through, with little help getting past 2400Mhz. I also read somewhere a lot of people can't get past 2400Mhz with the 3800 x2's, and this is the place to come for expert help. Notice that I am using WATER COOLING, so heat should be a huge factor. I have tried DOZENS of settings, and can't find a way past 2400Mhz.

 

Here is my system config settings. I also have my sig updated (yes, i read the forum rules!)

 

FSB Bus Frequency - 240

LDT/FSB Frequency Ratio - x3

CPU/FSB Frequency Ratio - x10

PCI eXpress Frequency - 100Mhz

 

CPU VID StartUp Value - Startup

 

CPU VID Control - 1.5v

CPU VID Special Control - Above VID * 102.4.%

LDT Voltage Control - 1.3v

Chip Set Voltage Control - 1.5v

DRAM Voltage Control - 2.8v

 

DRAM Configuration Settings:

 

DRAM Frequency Set - 166

Command Per Clock (CPC) - enable

CAS Latency Control (Tcl) - 3

RAS# to CAS# delay (Trcd) - 04 Bus Clocks

Min RAS# active time (Tras) - 08 Bus Clocks

Row precharge time (Trp) - 04 Bus Clocks

Row Cycle time (Trc) - 12 Bus Clocks

Row refresh cyc time (Trfc) - 16 Bus Clocks

Row to Row delay (Trrd) - 04 Bus Clocks

Write recovery time (Twr) - 03 Bus Clocks

Write to Read delay (Twtr) - 02 Bus Clocks

Read to Write delay (Trwt) - 03 Bus Clocks

Refresh Period (Tref) - 3120 Cycles

Write CAS Latency (Twcl) - auto

DRAM Bank Interleave - Enabled

 

DQS Skew Control - Auto

DQS Skew Value - 0

DRAM Drive Strength - Level 8

DRAM Data Drive Strength - Level 4

Max Async Latency - 8.0 Nano Seconds

DRAM Response Time - Normal

Read Preamble Time - 6.0 Nano Seconds

IdleCycle Limit - 256 Cycles

Dynamic Counter - Disabled

R/W Queue Bypass - 16x

Bypass Max - 04x

32 Byte Granularity - Disable(4 Bursts)

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Only thing I can suggest is try lower dividers, which you've probably done anyways. It's very possible that 2.4 is all that 3800 can do.

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I thought the '06 steppings were supposed to be good. Try to take the ram out of the equation for now and concentrate on the cpu.

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Ok....here's my tweaks that got it to 2700MHz! I hope this has a bit more left in it though...

 

DRAM Frequency Set - 166

Command Per Clock (CPC) - enable

CAS Latency Control (Tcl) - 3

RAS# to CAS# delay (Trcd) - 04 Bus Clocks

Min RAS# active time (Tras) - 04 Bus Clocks

Row precharge time (Trp) - 04 Bus Clocks

Row Cycle time (Trc) - 08 Bus Clocks

Row refresh cyc time (Trfc) - 16 Bus Clocks

Row to Row delay (Trrd) - 04 Bus Clocks

Write recovery time (Twr) - 03 Bus Clocks

Write to Read delay (Twtr) - 02 Bus Clocks

Read to Write delay (Trwt) - 03 Bus Clocks

Refresh Period (Tref) - 3120 Cycles

Write CAS Latency (Twcl) - auto

DRAM Bank Interleave - Enabled

 

DQS Skew Control - Auto

DQS Skew Value - 0

DRAM Drive Strength - Level 8

DRAM Data Drive Strength - Level 4

Max Async Latency - 10.0 Nano Seconds

DRAM Response Time - Normal

Read Preamble Time - 8.0 Nano Seconds

IdleCycle Limit - 256 Cycles

Dynamic Counter - Disabled

R/W Queue Bypass - 16x

Bypass Max - 04x

32 Byte Granularity - Disable(4 Bursts)

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its so strange that those few tiny tweaks got you to 2700mhz, how on earth did you find them out ?

 

Googled and found a guy who had an X2 3800+ on water doing 2900MHz. He said, and i quote :

 

"You could try lower the max async latency and read preable like I did, I thought it didn't matter since my Ram can run stable @ 250Mhz but putting mem divider makes it unstable even when the RAM is running lowever than 240Mhz."

 

Funny thing is, I can't find where i found it...some forum somewhere. Well, whoever posted it, thanks! I saved it to a text file, printed it off, and changed a few settings and now i'm up to 2700MHz vs my old limit of 2400MHz. Not bad for $150!

 

Now, I think my HT is limiting me at 270MHz....anyone have any idea on how to tweak to raise the limit?

 

-Shaun

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Guest Retratserif

I have to try that with my 3700+. I am hitting a litmit aroudn 2800. I can get it to boot at 2900 but very unstable.

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Well, i've tried numerous other settings. Looks like the HTT(fsb) craps out at 272MHz. I think this CPU could go a higher if it weren't for that limit. Anyone with known tweaks to up the HTT?

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Well, i've tried numerous other settings. Looks like the HTT(fsb) craps out at 272MHz. I think this CPU could go a higher if it weren't for that limit. Anyone with known tweaks to up the HTT?

 

== New ram:angel: !

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