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Not stable at common overclock!

I

ImFallingAsleep

Limp Gawd
Joined
Sep 15, 2002
Messages
144
2.6C@3.25GHz/250MHz FSB
OCZ PC4000 2x512MB @ 2.5-4-4-7 (By SPD)
Abit IC7-MAX3
Divider at 1:1
vCore at 1.575 and fluctuating between 1.50-1.55v
vDIMM at 2.9v
AGP/PCI locked at 66/33
Fortron/Source 400W PSU
Latest BIOS update

I assume it's not heat that's doing this. I'm using a mirror-finish lapped Swiftech MCX4000-B, Artic Silver 3, and a Thermaltake Smart Fan II at ~75CFM/4800RPM blowing down, three ~34CFM fans blowing in, and two ~28CFM fans blowing out, not including the PSU fan. It runs at ~40-43 idle, and I've seen it up to 50 degrees before it's crashed.

Well here's the deal. It boots at the overclock mentioned above, boot times seem sluggish, more so then at lower FSBs I've tried. Anyway, I'm getting ILLEGAL SUMOUT in Prime95. It's supposedly a hardware error. I've been having quite a few lock ups and sudden restarts. The CMOS has been reset three times now.

How come people are doing 2.6C@3.25 w/ 250MHz FSB with STOCK COOLING AND STOCK VOLTAGES? Most say they STILL have headroom for a larger OC and yet it took all afternoon to get it stable at 250MHz FSB with a 1:1 divider, and it crashes when it does anything remotely taxing like loading a game or using Prime95. Hell it's restarted suddenly doing NOTHING from the desktop.

What's goin' on? Do you think it's the motherboard, CPU, or memory? Aren't these voltages high enough?
 
Apparently the MAX3 doesn't regulate voltage well over 2.8v to the DIMMs, but I set mine to 2.9v and then 3.0v and both times MBM has told me they're exactly 2.91v and 3.02v. I also set my vCore to 1.65v and reads 1.60~1.65v, yet Prime95 still crashes within minutes of enduring a torture test.
 
you have exceeded the max OC of your chip man. Unless you feel comfortable pumping 1.8v or so thru that P4 Id say back off till it is stable, or try and back off on your memory timings and see if that helps. But end of story you may end up having to back off the OC. Remember just because others get those speeds doesnt mean you will.
 
I get stuck with that type of things around 650mhz OC myself. 550mhz is my sweet spot. So bump it down to 3.15 and see what it does.
 
if your rig is brand new try something

boot 245mhz fsb and run a cpu cruncher for a few days straight and "Burn" the proc in

Many people say thats not true but it worked for me

WHen i got my sys, I couldnt get much higher than 250-260 fsb

Now i can boot 280 5:4

luck

for a new chip. If youve had the sys for 3 months your 2.6c aint a g00d ocer
 
Originally posted by Cloud15x
if your rig is brand new try something

boot 245mhz fsb and run a cpu cruncher for a few days straight and "Burn" the proc in

Many people say thats not true but it worked for me

WHen i got my sys, I couldnt get much higher than 250-260 fsb

Now i can boot 280 5:4

luck

for a new chip. If youve had the sys for 3 months your 2.6c aint a g00d ocer
Click to expand...

if memory serves me right, your ram is sitting at

280/5 x 4 = 224mhz
so if my math is right then your actually running slower than your 245mhz
 
LOL Visable-assassin, that's funny. Yeah, it's nice and stable at 245MHz FSB with 1.575 vCore (actual around 1.53~1.57v). I'll try laxin' the timings just to see if it'll help, but thank you to all that replied.
 
im not talking mem bandwidth

Im talking about actual CPU o/c

No i dont boot at 280 b/c i lose performance

right now with 2.8v's in the ram i can boot 1:1 2.5-3-3-7 at 263

When I get my case up from moddin Ill try bootin 3v's into em and maybe 270 since i know my cpu will do 280 as shown above

and no i didnt get pwned
 
Originally posted by kleptophobiac
Overclocking is a gamble
Click to expand...
^^
dont ever think that just cuz others are getting those results, that you will to
 
ImFallingAsleep glad I could make ya laugh bud :)
But on your P4 watch your vcore man...I think P4's seem to die at around 1.7 or 1.8v I forget....as for your ram trying to relax your timings a bit then post back to us :)



Originally posted by Cloud15x
im not talking mem bandwidth

Im talking about actual CPU o/c

No i dont boot at 280 b/c i lose performance

right now with 2.8v's in the ram i can boot 1:1 2.5-3-3-7 at 263

When I get my case up from moddin Ill try bootin 3v's into em and maybe 270 since i know my cpu will do 280 as shown above

and no i didnt get pwned
Click to expand...


if you are useing 280 with the 5:4 divisor yes you are losing performance...now if your speaking from a 1:1 divisor youd have it made. And as for pumping 3v into ram...myself I would never recomend it...
 
Originally posted by Visable-assassin
ImFallingAsleep glad I could make ya laugh bud :)
But on your P4 watch your vcore man...I think P4's seem to die at around 1.7 or 1.8v I forget....as for your ram trying to relax your timings a bit then post back to us :)






if you are useing 280 with the 5:4 divisor yes you are losing performance...now if your speaking from a 1:1 divisor youd have it made. And as for pumping 3v into ram...myself I would never recomend it...
Click to expand...

Hes talking about the actual CPU working at 280 FSB after burn in regardless of ram divider... obviously 5:4 is slower then 1:1.
 
as long as you have decent cooling, bump the voltage a notch. you could also try lowering the memory divider.

as for the burn-in, see my sig.
 
Originally posted by DiseasedCow
I have the max2, and the latest bios...

so they may have changed the voltage of the max3
Click to expand...

I'm talking about revisions of the same motherboard. There were NF7-S 1.0, 1.1, 1.2 and 2.0.
 
The MAX3 goes up to 3.2v vdimm.

TO: Original thread poster... stepping? Don't even bother posting an oc failure without the stepping.

:rolleyes:
 
a little offtopic, but when do you actaully have to change the voltage? miens at .25+, all i do is change the fsb, not messng with the voltage. im using an msi kt3 ultra. thanks.
 
Originally posted by hellzassasin
a little offtopic, but when do you actaully have to change the voltage? miens at .25+, all i do is change the fsb, not messng with the voltage. im using an msi kt3 ultra. thanks.
Click to expand...
you can overclock quite a ways on stock voltage, depending on the chip, but upping the voltage a bit opens up a lot more headroom.

Unfortunately my TH7-II RAID runs at 1.6V max:rolleyes:
I'd do a volt mod, but my temps are kind of high already.
 
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