Intel Pentium D 805 stuck at 3.83GHz...restricted by motherboard?

[natewildes]

It's water cooled with an Apogee, D4, single heatercore and panaflo, so maybe the ECS C19-A SLI is restricting the max OC? I have 1GB DDR2 5400 Patriot Signiture Series in dual channel setup, if that makes a difference....I've seen people get 3.8GHz on air, so it must be some other hardware, right? Temps are 33c idle and 37c load...

[Ad Rock]

I honestly dont see how your motherboard could be holding back that chip. The FSB needed to run at 4 ghz is only 200mhz. Any motherboard you could buy for that CPU will run 200 mhz.

Sounds to me like you hit the limit on your chip, still its a 1.2 ghz OC, not bad :D.

[natewildes]

The guy who previously owned it hit higher on air, and most other chips on the market go higher, so why doesn't mine? I've heard stepping has to do with it, but can it really make the difference between 3800MHz and 4000MHZ??

[Epox4life]

For air that sounds about right 3.8ghz but should be able to get 4ghz on water.
what are your vcore settings?
you locked the PCI-E and PCI speeds right?
You probably just need to up the vcore.

[natewildes]

I ran the voltage right up to the max, 1.6v, but the real voltage that CPU-Z reports is 1.55v. I wasn't aware that the PCI/Express speeds affected the OC potential, I'll try upping one or the other when I get home.

[Ad Rock]

I wasn't aware that the PCI/Express speeds affected the OC potential, I'll try upping one or the other when I get home.

You dont want to change your PCI/Express speeds you want to make sure you lock them at 33.33/100.

Also did you see your chip running at 4.0 ghz on air? Or is that just what was told to you when you bought it?

Are you running your memory on a divider? Drop it to 1:1 just to make your memory isnt the problem with the OC.

[iceage]

Another thing you might want to check - is the Vcore drooping or fluctuating a great deal? Check out the 12v rail on your PSU. If it keeps jumping around 11.5 and 12v then your PSU might be holding you back. Also check the temps on the MB fets. Explosively high temps on the fets can limit an OC.

[Mr.Guvernment]

2 people cam have identical steppings / chips, but not get the same results even with the same harddware

O/C'n is not %100 garuntee'd across the board.

[natewildes]

I don't think it's my power supply (Antec SmartPower 450 watts), but it may be my memory. I'll fiddle for a while and see what happens, thanks people.

[natewildes]

No luck, I'm still stuck at the same speed. I can change the 'speed' of my memory and PCI-Express, the memory I can send up to 710 stable and the PCI-Express I haven't fiddled with at all, but stock it's 100.000MHz. Should I try upping the PCI-Express? It doesn't seem like that would have anything to do with the CPU, perhaps my budget memory just can't handle it? My timings are 5-6-6-16-22.

[Ad Rock]

If your RAM can run at 710 mhz then it is definetly not the problem. Sounds to me like you just hit the limit of your CPU. Can you at least boot at a speed higher than your limit? If you can boot just run memtest to be sure that your memory is not whats holding you back.

[natewildes]

I can't even boot, that's the problem. I'm rather disappointed, I was hoping for 4GHz+.... :(

[BadThad]

Should I try upping the PCI-Express?

Hell no, you want to LOCK it!

I think someone may have been yanking your chain on the 4GHz on air claim. That's very rare for one of these based on what I've read.

[WarriorII]

Agreed,

These chips haven't been out that long, so I'm sure you can "Search" for all the Threads on it so far.

4Ghz on water. 3.8-4.0 on air MAX.

YMMV


Ninja just set one up on air & got good results.
but he's got some decent Hardware too.

again, YMMV, even with the exact same CPU.

(and 3.83 ain't nothin to sneeze at)

[y0bailey]

i have the same setup as you minus the watercooling, and your problem is not enough vcore. the board slightly undervolts and can only go up to 1.6. I hit 3.85 stable, but i cannot go any higher due to being maxed out on voltage. tough luck i guess, but not too shabby for an $80 SLI mobo

[Blackmage]

yep it's the chipset on the motherboard the nforce ie edition is not a great overclocker

[y0bailey]

no...you are wrong. the nforce chipset will hit around 250fsb, we are sitting under 200. that is the beauty of the 805 + nforce combo. the problem is this particular motherboard has limited vcore options

[bignick]

I've been playing with an 805 for a week or to and it's your Vcore that's hurting you.I think you have hit that chips limit because most can hit 200mhz on 1.5625-1.6V. Unless your Vcore droop is really that bad. It's really weird you can hit 191-192 with 1.5V and after that it needs alot more voltage. What kind of temps are you running. I'm on air and I can't go past 192fsb because of temps. If I go to 193 it starts throttling. It hits 70+. I have seen a few go 4ghz on but all of them were stepping SL8ZH and on Ninja's.