2.8 MO SL6Z5 @ 3.3gig => *stuck* at 236fsb => any advice ?

[BEIF]

Hello

Can people please help me figure out if I have *missed" something *OR* am I just one of the [relativley] "unlucky" ones whose 2.8MO wont go too high.

Setup is:-

- P4P800
- Latest 1016 BIOS
- 2.8 MO SL6Z5 @ 236mhz fsb @ 1:1 memory @ 3/4/4/8 = 3.3gig
- Costa Rica / Pack Date Feb 9 2004 / FPO Batch 3351A279
- 2 x 512 Hynix D43 DDR @ 2.75v @ 1:1
- Memory ratio set to 1:1 / 400
- BIOS CPU Voltage set to 1.6000v
- DDR voltage is 2.75v
- AGP voltage is 1.60v
- P4P800 "idle" CPU voltage [ via AsusProbe ] = 1.648 <-> 1.664
- P4P800 "load" CPU voltage [ via AsusProbe ] = 1.584 <-> 1.616
- using the Stock cooler with the thermal pad removed and AS3 applied
- Temps are *not* an issue - 30'C idle / 46'C artificial max load
- H/T is OFF in BIOS
- AGP Locked at 66.66 / 33.33
- MAM is on
- Perf Mode is STANDARD [ givee me Partial PAT as per CTIAW ]
- DRAM by SPD is selected - CPUz confirms DDR is at 3/4/4/8 @ 1:1
- Spread Spectrum - DISABLED
- ICH Delay - DISABLED
- PnP O/S - YES
- Pwr Mangt = ENABLED


At these voltages and settings 236fsb is fully P95 stable and system is fully stable.

Please dont get me wrong - 500mhz for free is FANTASTIC as far as I'm concerned, its just that everyone else seems to be hitting ~250mhz at close to stock voltage which is making me suspicious that I have done something wrong.

I *do* know for a fact that this motherboard and these 2 Hynix 512 D43 sticks work perfectly up to 259mhz @ 2.75v @ 1:1 because that is what they were running at in the exact same system with my "old" 2.4C - the *only* thing I have done is upgrade my CPU to a 2.8C MO, so I know it is not the motherboard or ram holding me back - my "old" 2.4C ran at 12 x 259 @ 1:1 @ the above voltage settings fully P95 stable and fully "real world" stable.

So far have tried 2.85v for memory and/or 1.70-1.80 for AGP voltage / and/or MAM off / and or Perf Mode to AUTO all to no avail => anything above 236 either reboots during boot up or during intial Windows XP use or gives me a BSOD during bootup [ before windows has finished loading ]

So .... I *seem* to be left with considering upping the voltage for the CPU higher.

Q => do people have any other thoughts / options I could try ?

Given my voltage is 1.6000v in BIOS which equals 1.648 <-> 1.664 at idle and 1.584 <-> 1.616 under load

Q => do I have any more voltage headroom to play with ?

Any comments / thoughts / suggestiosn would be grealty appreciated.

Ben [ BEIF ] Ifin

 

[BEIF]

Forgot to add:-


- I tried the 3:2 and 5:4 memory ratio's but my P4P800 wont boot at all with either a 5:4 or 3:2 memory ratio when the FSB is 230mhz or higher *YET* it happily works at 1:1 at up to 259mhz fsb - go figure !!


Ben [BEIF] Ifin

 

[RaynorWolfcastle]

IIRC, the 2.8C comes with an all-aluminum cooler not, the copper-cored heatsink used for 3+GHz Northwoods and Prescotts. Your temps seem to be a little on the low side for 3.3 GHz, are you sure you're reading the right temperatue? I do know that Abit reads higher temps but my IS7 with a 2.4C@ default vcore @ 3.1 GHz runs hotter than that with a Zalman 7000-AlCu heatsink.

Apart from that, it may just be that this particular CPU just isn't a great overclocker. I'm sure others will have more thoughts, since I am only a mild OC'er .

 

[THUGSROOK]

why are you using 1.6v vcore?

if it needs 1.6v vcore you arent stuck, youre done.

 

[BEIF]

Hmmm ....

I thought / assumed that as my cpu-under-load-voltage-range was 1.584v <-> 1.616v , I could still bump it up a little as long as the my cpu-load-voltage-range remainded *below* 1.6500v - the generally accepted *maximum [safe]* voltage for N/W P4's ?

Ben [BEIF] Ifin

 

[THUGSROOK]

i personally dont concider 1.65v acceptable.

 

[myocardia]

Originally posted by: BEIF
Hmmm ....

I thought / assumed that as my cpu-under-load-voltage-range was 1.584v <-> 1.616v , I could still bump it up a little as long as the my cpu-load-voltage-range remainded *below* 1.6500v - the generally accepted *maximum [safe]* voltage for N/W P4's ?

Ben [BEIF] Ifin

That's true, from what I know, but you're still "stuck" there until you get some good cooling-- a minimum of one intake fan, one exhaust fan and a good aftermarket heatsink/fan, which is known around here as an hsf.
BTW, what are you using to get, as you called it, an "artificial max" temps?

 

[MichaelZ]

don't worry about what you set it in frequency control, worry about the BIOS Vcore readout.

i set mine to 1.6 in the bios, actual voltage is just hovering around 1.54 ~ 1.55. i wouldn't be exceeding 1.55V readout for an OC IMO.