Would like help with OC'ing.

[bchivers]

How do I find my maximum RAM FSB? I am trying to get this Opty over 3GHZ, at 2.85 GHZ now. Here are my settings.

FSB Bus Frequency............................. - 315
LDT/FSB Frequency Ratio....................... - 3x
CPU/FSB Frequency Ratio....................... - 9x
PCI eXpress Frequency......................... - 100Mhz
HT Buss speed ......................... - 945 MHZ

CPU VID StartUp Value......................... - 1.35v

CPU VID Control............................... - 1.40v
LDT Voltage Control........................... - Stock
Chip Set Voltage Control...................... - Stock
DRAM Voltage Control.......................... - 2.60v

DRAM Configuration Settings:

DRAM Frequency Set............................ - 150 (DRAM/FSB:3/04)
Command Per Clock (CPC)....................... - Enable
CAS Latency Control (Tcl)..................... - 3
RAS# to CAS# delay (Trcd)..................... - 4
Min RAS# active time (Tras)................... - 8
Row precharge time (Trp)...................... - 4
Row Cycle time (Trc).......................... - 12 Bus Clocks
Row refresh cyc time (Trfc)................... - Auto
Row to Row delay (Trrd)....................... - 02 Bus Clocks
Write recovery time (Twr)..................... - 02 Bus Clocks
Write to Read delay (Twtr).................... - 02 Bus Clocks
Read to Write delay (Trwt).................... - 03 Bus Clocks
Refresh Period (Tref)......................... - 3120 Cycles
DRAM Bank Interleave.......................... - Enabled

DQS Skew Control.............................. - Off
DQS Skew Value................................ - 0
DRAM Drive Strength........................... - Normal
DRAM Data Drive Strength...................... - LEVEL 1
Max Async Latency............................. - 10 NS
DRAM Response Time............................ - Normal
Read Preamble Time............................ - 8.5 NS
IdleCycle Limit............................... - 256 Cycles
Dynamic Counter............................... - Disable
R/W Queue Bypass.............................. - 16 x
Bypass Max.................................... - 07 x
32 Byte Granularity........................... - Disable(8 Bursts)

 

[thegimp03]

Increase ram fsb 5% at a time until you run memtest86 and it fails.

 

[stockjock]

I'd be very interested in your settings if you hit 3Ghz. My setup is not too different from yours except I'm water cooled. If you hit 3Ghz, please post your settings again.

thanks

stock

 

[Noubourne]

To test RAM, you kick down your CPU multiplier so that it's underclocked. Then kick up your HTT a little at a time and use memtest to test for stability on the way up. I can't remember, but I think I usually use tests 5, 8 and 11 for quickie tests on the way up, since they tend to throw errors first. Start at stock volts (I also usually loosen timings as LOOSE as I am willing to go to start with). When you hit an error, up the volts a little, see if it fixes, and keep on moving. Rinse repeat until you are afraid to increase volts any more and have reached top speed. When you get errors at the top speed/voltage you're comfortable with, start inching the HTT back down till you find out a setting that passess a full run of MemTest 86. Then I tighten settings a bit until I hit errors, and then back off the timings a tad until it's stable. Then call that max stable speed. I don't know that RAM offhand, so I can't tell you what it will or will not do.

It's time consuming.

 

[myocardia]

You have PC4000 RAM, you shouldn't be using the 150 Mhz divider. Set your divider to 180 Mhz, and your timings to 3-4-4-7, with 2.80v vdimm: link. Oh, and you aren't going to see much of a difference in performance, going from 2.85 Ghz to 3.0 Ghz, if your processor can even handle 3.0 Ghz; you'll also almost certainly have to buy a better heatsink. You'll get about 3x as much of a performance increase by raising your divider to 180, instead of 150 Mhz, than you will by raising your cpu another 150 Mhz.

 

[bchivers]

Originally posted by: myocardia
You have PC4000 RAM, you shouldn't be using the 150 Mhz divider. Set your divider to 180 Mhz, and your timings to 3-4-4-7, with 2.80v vdimm: link. Oh, and you aren't going to see much of a difference in performance, going from 2.85 Ghz to 3.0 Ghz, if your processor can even handle 3.0 Ghz; you'll also almost certainly have to buy a better heatsink. You'll get about 3x as much of a performance increase by raising your divider to 180, instead of 150 Mhz, than you will by raising your cpu another 150 Mhz.

I tried 180@2.8v and 2.9v I am able to boot at 2.6GHZ but more than that and it freezes up. At a 160 divider I can run at 2.8GHZ @ 2.9v. Where is the performance going to be better, with the 18022.6 OR 188@2.7ghz?
Thanks to all for the help.

 

[StopSign]

Originally posted by: myocardia
You have PC4000 RAM, you shouldn't be using the 150 Mhz divider. Set your divider to 180 Mhz, and your timings to 3-4-4-7, with 2.80v vdimm: link. Oh, and you aren't going to see much of a difference in performance, going from 2.85 Ghz to 3.0 Ghz, if your processor can even handle 3.0 Ghz; you'll also almost certainly have to buy a better heatsink. You'll get about 3x as much of a performance increase by raising your divider to 180, instead of 150 Mhz, than you will by raising your cpu another 150 Mhz.

Actually using dividers to slow down memory has very little effect on overall performance on K8 systems.