SL6RZ only at 3 gig => what is holding me back ?

BEIF · Apr 16, 2003

My setup is:-

- Retail box Costa Rica SL6RZ @ 167fsb @ 1.575v [in bios] = 1.616v in reality = totally stable
- week 6, 2003
- Asus P4B 533 board with latest bios
- Stock Retail HSF combo with pad removed, lapped and ASIII applied
- idle temp ~ 30C
- *artificial* full load temp ~ 55C
- *realistic* full load temp ~ 46C
- AGP/PCI lock at 66/33
- memory at 1:1
- all other bios settings at default

At 1.575v in bios, it is totally stable at 3006 - at 1.525 or 1.55, it falls over with CPU Burn and Prime95.

*BUT*..........

At 1.575v in bios, it will happily boot up into XP at around up to 178mhz, but it will fall over quite quickly with either CPU Burn or Prime 95.

I'm assuming that given it is a Costa Rica SL6RZ, it *should* do better than 167fsb, especially given how easily it boots up around the 178fsb mark at 1.575v.

So......what is stopping me from being stable at over 167fsb ?

=> is it the HSF ? [ temps do not *appear* to be the problem ]

=> or is it simply that 167fsb is the realistic max of this chip ?

All comments / thoughts / advice would be gratfuly appreciated.

BEIF

Duvie · Apr 17, 2003

falls over???? What kind of error is prime95 reporting??? Many are noting that these c1's have stability issues at higher vcore possibly...Also if you are at 1.61v at 167fsb then I would imagine you could only get another 2-3fsb before you are in the danger zone of 1.7v. Once these chips need vcore boost what is left is usually 8-10fsb to 1.7v....

Is that one of the multi-vid chips?? If so what did it default to???

BEIF · Apr 17, 2003

Hi Duvie

Yes - its a multivid - defaults to 1.525 on installation - also, it has 1.525v [max] written on the box label.

I forgot to ention that I use a 1 x 512 stick of PC2700 Kingston ValueRam - I would not think that it has anything to do with the "falling over".

By "falls over", I mean that with CPU Burn, it "locks-up" the CPU and with Prime95, it reports "errors" in mumber calculations [whatever that means].

Duvie - I see you have the same chip.

- What SL is yours ?

- do you think "upgrading" my HSF combo would help to get past 167 ?

BEIF

THUGSROOK · Apr 17, 2003

do you think "upgrading" my HSF combo would help to get past 167 ?

it can

make sure your CAS is set to 2.5-3-3-7 turbo = off 2.7v before making any purchases tho

what onboard items are you using?

human2k · Apr 17, 2003

Originally posted by: THUGSROOK

do you think "upgrading" my HSF combo would help to get past 167 ?

Click to expand...

it can

make sure your CAS is set to 2.5-3-3-7 turbo = off 2.7v before making any purchases tho

what onboard items are you using?

do that, and get a better HSF.

BEIF · Apr 17, 2003

Hi Thugsrook

I understand the memory timings, but where in a P4B 533 is the "TURBO" setting ?

Also, are you saying to up the DDR voltage to 2.7V ?

BEIF

BEIF · Apr 17, 2003

BTW

My Prime95 error is a "Hardware Defect" "Rounding Error"

BEIF

LastRide · Apr 17, 2003

Yes,he's saying set your memort timings to 2.5/3/3/7.This makes sure your ram doesn't hold you back while you find how high your cpu goes.You might want to up the vdimm voltage for memory to 2.7-2.8.It will take you farther if your reaching the limit of your ram.Your ram could be crap too.You can also try running your ram by speed and 1:1 and see if one runs better with your setup.Rounding errors I think is ram.Thats when to up the vdimm voltage,but usually upping your vcore fixes it.

fyleow · Apr 17, 2003

Maybe you just have a bad chip. I've had the multiple VID steeping 2.53 and 2.4 and both didn't overclock so well. About 3.25 ghz-ish with watercooling and a BH7. It's not my memory either since I have Samsung original 400 mhz DDR.

My 2.8 ghz is a good example, it can run 3.25 ghz no problem with default voltage. Bump it to 3.46 ghz and running 1.75V is barely stable. Some CPUs just have a brick wall that they hit.

LastRide · Apr 17, 2003

Also be careful.Me and Thugs had the P4B533.Its an excellent board but you have to watch out for the overvolting at idle of .06-.07 .So if your vcore is at 1.575 its really at about 1.635 to 1.645 at idle.Also I believe Thugs says he does better with an older bios than the new one.Can't remember which one,but you might find otherwise.

LastRide · Apr 17, 2003

Install PCProbe off the CD that come with your mobo and you will see what the vcore is running at.

THUGSROOK · Apr 17, 2003

bios v1008 is you use USB, v1011 if you dont.

what efforts have you taken to cool the northbridge?
lapped as3 and a fan?

use all 3 power plugs on that board too.

BEIF · Apr 17, 2003

Hi Thugsrook

=> Why would changing the BIOS back to 1011 from 1014 improve O/C prospects ?

=> 'What do you mean by "use all 3 power plugs"

- I am aware of the EZPlug & the ATX 12v plug - which is the 3rd ?

- What will using the EZPlug achive ? Wont it give too much power ?

BEIF

Ketchup · Apr 17, 2003

I think Thugsrook means the board has a molex connector as well as the standard P4 plug, so make so you use them both.

LastRide · Apr 17, 2003

On the P4B533 you have the ATX big connector,the 4 pin plug for P4 cpu's "square" and a regular 4 pin molex connector.You can try plugging in all 3 and see if it helps,but as you know the ATX and the P4 "square" plug must be connected.The molex one that looks like the one thats on your power supply plugs is usually only used if your power supply does not have the square P4 plug.

dbwillis · Apr 17, 2003

Shouldnt the AGP/PCI lock be a few bumps up from 66/33 too?

Duvie · Apr 17, 2003

Originally posted by: BEIF
Hi Duvie

Yes - its a multivid - defaults to 1.525 on installation - also, it has 1.525v [max] written on the box label.

I forgot to ention that I use a 1 x 512 stick of PC2700 Kingston ValueRam - I would not think that it has anything to do with the "falling over".

By "falls over", I mean that with CPU Burn, it "locks-up" the CPU and with Prime95, it reports "errors" in mumber calculations [whatever that means].

Duvie - I see you have the same chip.

- What SL is yours ?

- do you think "upgrading" my HSF combo would help to get past 167 ?

BEIF

Mine is a retail SL6EF.....

I wouldn't upgrade hsf yet as I have seen no proof that heatis even the issue.....

1) reduce cas settings
2) make sure agp/pci is locked
3)follow thug's advice as he has personally owned and used the p4b533...one of the pioneers with that one...

THUGSROOK · Apr 17, 2003

Originally posted by: dbwillis
Shouldnt the AGP/PCI lock be a few bumps up from 66/33 too?

Mikki tested the P4B533 using a geiger counter ~ the agp/pci lock works perfectly at all speeds and all locks.
he also tested the P4G8X ~ same perfect results.

bios versions will depend on weather or not you use USB and want it to still work!

Ketchup · Apr 17, 2003

What memory are you using? When the computer crashes, what does it do? Restart? Freeze? Blue Screen? Kick you back to Windows desktop? What memory ratio are you running?

BEIF · Apr 17, 2003

- am using Kingston PC 2700 ValueRam running at 1:1 at SPD settings
- I have messed around with memory settings as suggested - no difference
- AGP/PCI lock is on at 66/33
- all "junk" is turned off in the BIOS - Sound, USB, un-needed ports
- running in PIC not ACPI mode
- using 1014 bios
- no HSF on the N/Bridge
- temps do not appear to be an issue 30C <-> 46C [ 55C is an artificially induced high using CPU Burn ]
- m/board temp is < 30C and case is well ventilated
- room temp is a cool-ish 20C
- standard Intel HSF wiht pad removed and AS III applied
- Prime95 gives me "rounding" errors
- CPU Burn locks-up the whole machine

Q => As CPU Burn is locking-up the whole machine and it *only* tests the CPU, I dont think RAM or RAM settings are the issue ??

Q => Given I have all the "junk" turned off in the BIOS, I dont think going back to 1011 is needed ??

BEIF

LastRide · Apr 17, 2003

Have you set your ram timings at 2.5/3/3/7 yet?.Try that and it should pass prime.If not raise the vdimm up one.Your ok up to 2.8 vdimm.Set your memory timings to what I said.

Duvie · Apr 17, 2003

Well...hard locks huh!!! How about that power supply??? List brand and specs and list the voltage rails as seen at idle and load....If vcore or +12v rail was to drop far enough down under loading it could freeze in cpuburn and cause the cpu to trip up on a number and thus the rounding error....

Power supply may be ineffective or it does need more juice and this just isn't a very good ocing chip..still good just not one of the better ones...

Nomjr · Apr 17, 2003

Do the multi vid chips default to 1.525 or 1.475? I have a SL6RZ Coast Rica I got in mid Feb that defaults to 1.525 and I just picked up another one that defaults to 1.475. The one that defaults to 1.525 only does 3.42 @ 1.625V and the one that defaults to 1.475 does 3.42 @ 1.50. Just wondering if your at "your" limit on that chip?

BEIF · Apr 18, 2003

Hi Duvie & others

My Power Supply is a Topower 420 "Gold" twin fan unit.

Measured with the latest version of AsusProbe, the Specs under Idle and CPU Burn Load are:-

IDLE

12V - 11.84
+5v - 4.919
3.3v - 3.344
Vcore in BIOS is 1.575 - 1.616 Actual @ idle

Under CPU Burn Load

12v - 11.584
+5v - 4.945
3.3v - 3.328
Vcore in BIOS is 1.575 - 1.52v @ idle

This is the same P/S that powered my 1.6A @ 2.415gig @ 151 fsb @ 1.616 Actual

BEIF

BEIF · Apr 18, 2003

BTW

I just tried the 1011 bios and there was no change or benefit.

Beif

SL6RZ *only* at 3 gig => what is holding me back ?

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SL6RZ only at 3 gig => what is holding me back ?