help with 6400

[pigmaster]

I was helping my friend overclock his 6400, but his fsb refused to go over 320.
Any ideas?
Mobo: P5B
Ram:OCZ ddr2 800
PSU: Rosewill modular 550W

[rainless]

I was helping my friend overclock his 6400, but his fsb refused to go over 320.
Any ideas?
Mobo: P5B
Ram:OCZ ddr2 800
PSU: Rosewill modular 550W


+.1 to MCH, +.2 to DDR. Then up the CPU volts to 1.5

Then bring down the CPU volts and see how low you can go...

[pigmaster]

i tried what you said, but even at 1.5 his system crashes at 230 fsb

[deathman20]

Make sure the northbridge heatsink is nice against the chipset. Make sure theres cooling in the area too, even at stock voltages it can get very toasty.

BTW Is this just the normal P5B? Or is it a deluxe? I have the P5B-Deluxe WiFi and I personally don't need a voltage increase to any of my chipsets only thing I upped voltage on was ram and CPU and I can clock it to 395+ without any problems.

[RangerXLT8]

+.1 to MCH, +.2 to DDR. Then up the CPU volts to 1.5

Then bring down the CPU volts and see how low you can go...

1.5v for 320FSB is wayyyy to much, just wreckless.

1.4V should atleast post 400FSB.

Make sure any 'Performance" settings like Memory PErformance yada yada, and Turbo, all that stuff are disabled.

[pigmaster]

it's the normal P5B and i'll try that out ranger next time i get the chance

[inkfx]

What about a BIOS update? Sounds like its problems with the motherboard.

[DumpALump]

Pretty sure most people had best results with P5B Deluxe (wifi) and people had worse results with P5B vanilla. I have a 6400 with P5B deluxe and am slowly climbing in speed(testing stability at each point) at 1.4v. Most people wouldn't need more than 1.45v to get to 400mhz on DS3 or P5B deluxe.

[greenmaji]

What about a BIOS update? Sounds like its problems with the motherboard.

It takes a bios update to get the P5B to perform, try as advised by inkfx here :)

[rainless]

1.5v for 320FSB is wayyyy to much, just wreckless.

1.4V should atleast post 400FSB.

Make sure any 'Performance" settings like Memory PErformance yada yada, and Turbo, all that stuff are disabled.

I know 1.5 volts is too much. But that's how many volts you have to give the chip to ensure that the problem isn't "not enough vcore" then you scale down from there to find the "sweet spot." And I dare not call it "wreckless" if you're running at 1.5 volts for like 5 minutes. For 320FSB it's too much... I'll agree with you there. But I first got to 400x8 by running 1.5 volts... then 1.45 volts... then 1.35 volts...

[rainless]

Pretty sure most people had best results with P5B Deluxe (wifi) and people had worse results with P5B vanilla. I have a 6400 with P5B deluxe and am slowly climbing in speed(testing stability at each point) at 1.4v. Most people wouldn't need more than 1.45v to get to 400mhz on DS3 or P5B deluxe.

1.35 will get me to 400x8 on my DS3. I think volts to the ram are more important than volts to the CPU at that point. I was never able to get to 480x7 on the chip though. I'm assuming it would require more volts than I am willing to throw into it. But 475x7... 450x7 is not too bad :)

[deathman20]

1.35 will get me to 400x8 on my DS3. I think volts to the ram are more important than volts to the CPU at that point. I was never able to get to 480x7 on the chip though. I'm assuming it would require more volts than I am willing to throw into it. But 475x7... 450x7 is not too bad :)

Why not just stick to the 8 multiplyer and OC more. If you get 3.2Ghz on 1.35V you have lots of room still.

[rainless]

Why not just stick to the 8 multiplyer and OC more. If you get 3.2Ghz on 1.35V you have lots of room still.

Because at 1.35v 400x8 the temps are not what I would call "nominal". It idles at like 55 (see 400 Club Part 2) and the load temps I dare not speak of. I think 55...56 is a decent load temp (that's what I get at 400-450x7) and I'm concerned about the longevity of my processor more than anything. I'm sure I'll get the three years of my warranty out of the thing (I mainly run at stock) and after the warranty I'll overclock it beyond all reason until I get a new chip. That's what I tried to do with my 2600+. But I sold it a LOT faster than I thought I would. So I only got it up to 2ghz and never did get the 200FSB I wanted... (2.2 ghz) Alas...

Edit: Also I pretty much agree with this guy http://www.ocforums.com/showpost.php?p=4695565&postcount=4

1.35 is fine for 400x8, but immediately after that the cost of living SKYROCKETS!

[Gabbiani]

1.35 does 3.2 easy for me. Above that and the costs do seem to skyrocket on the DS3.

Anyone know why?

[rainless]

1.35 does 3.2 easy for me. Above that and the costs do seem to skyrocket on the DS3.

Anyone know why?

At 3.2ghz you're almost exactly 1.1ghz faster than spec... which is STAGGERING when you think about it. All those people getting 3.2ghz out of a Pentium D 805 started OFF at 2.66ghz. They only had to overclock like 660mhz. So it stands to reason it would take a lot more volts to get past a 1.1ghz overclock. I can GET TO 3.2 at 7x multi. But getting past is the same thing. More volts. Everybody that hit 4ghz on the E6400 did it on dry ice/alien technology/magic fairy dust.

[SeanBest]

Everybody that hit 4ghz on the E6400 did it on dry ice/alien technology/magic fairy dust.


So Damn True!

[rainless]

:beer:

[deathman20]

Or extremely high tempatures either way you wouldn't want that for a 24/7 setup type.

[rainless]

Or extremely high tempatures either way you wouldn't want that for a 24/7 setup type.

Yeah... The 3.5ghz you're getting on the E6600 seems much more reasonable. I would be happy running at 3.15ghz on my E6400. Why would you ever need to be faster than that? That's a slightly higher than 1ghz overclock right there, and at that speed you're already killing an FX62. It's faster at 450x7 than 400x8 because the ram is doing 900mhz as opposed to 800. So if I could maintain low enough temps I would run 450x7 24/7. Or if I was a bit more prudish about temps I would run 400x7 for 2800. I haven't checked to see if 350x8 would produce cooler temps... but I know 400x7 produces faster ram speed :)

[greenmaji]

They did it on 1.645Vcore and temps most would find far from reasonable :p

[rainless]

They did it on 1.645Vcore and temps most would find far from reasonable :p

There's normal reasonable, and then there's Crocodile Dundee Reasonable: "Ya call that a fire? That's not a fire. THIS is a fire!"

[deathman20]

Yeah... The 3.5ghz you're getting on the E6600 seems much more reasonable. I would be happy running at 3.15ghz on my E6400. Why would you ever need to be faster than that? That's a slightly higher than 1ghz overclock right there, and at that speed you're already killing an FX62. It's faster at 450x7 than 400x8 because the ram is doing 900mhz as opposed to 800. So if I could maintain low enough temps I would run 450x7 24/7. Or if I was a bit more prudish about temps I would run 400x7 for 2800. I haven't checked to see if 350x8 would produce cooler temps... but I know 400x7 produces faster ram speed :)

You could use a divider to up your ram speed. Use a 4:5 divider and that will push your ram to 1000Mhz if it works at that speed using the 400x8 settings.

[rainless]

DS3 doesn't have dividers :)