Why do some P5-Bs not like 400+ fsb

Buckster

Buckster

Buckster

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I hear everywhere how the P5-B is unstable at about 340 + - but then becomes stable at 401+ as it changes strap ?

I can't get mine anywhere near stable at 401+ - but its fine at 365fsb ... any ideas ?

so at x9 multiplier I can get up to 3.33 or so - fine

but even at 401x8 - ie 3.2 - and at higher vcore - it just won't play ball

its spectactularly bad too - sometimes bios freezes as soon as you set 401x8 and press save - sometimes the pc will not even post

I even tried manually setting the mobo voltages- to no avail.

is it just motherboard variation ?

I know the RAM can take it, I know the CPU can take it ??

thanks,

cheers, Mark.
 
I have a commando that exibits these exact symptoms. I have a E4300 that it wont play ball with. I have another commando that I recieved today that I will be playing with this weekend, as well as an E6400. Ill let you know how I get on and if I find its down to the mobo, or the cpu. I know I have a commando but its basically a p5b. I bought the mobo on reports all over that ~500fsb was commonplace, so far my experiance has not been so great.
 
Aye the latest one is 1004 as far as I know, and mine is acting odd too.

Getting lower temps at higher FSBs, LOL.

Not complaining about that though. ;)
 
Ulfhedjinn - does yours managed 401 + fsbs ?

odd that mine and my friends both don't - we have the same RAM though - I'm wondering if some RAM doesn't like operating at that fsb - mine is rated at CAS5 - DDR 800 - so should be OK -but there is a large difference in actual RAM bandwidth vs 266x9 and 401x8 (much higher sisoft score)

Something obviously doesn't like it at all - as I said sometimes bios even crashes, or pc won't even post.

yet if I push it up to say 3.4 gig @ x9 multiplier, it will boot - just will fail Orthos etc - much less spectacular failure though

Mark.
 
Buckster said:
Ulfhedjinn - does yours managed 401 + fsbs ?
Click to expand...
Aye 465MHz FSB at the moment and counting, I was previously at 458MHz FSB and my load temps have dropped about 7°C since then. :confused: But yeah, 465MHz FSB and counting. Going fine for my P5B.
 
eeek ! - thats good

any idea to what could be causing my 401+ fsb problems ?

it hates it so much must be something - but I can't fathom out what

CPU has enough Vcore - and I know it will clock higher at x9

RAM should be OK - have had it stable up to 890 MHz - but perhaps it doesn't like the 1600+fsb

Component on the motherboard itself ?

Mark.
 
Not sure mate but I will show Tom|Nbk this thread, he's the one who got me to buy a P5B and he knows more about specific issues with this board than I do.

Should easily be doing well over 400MHz FSB though unless your CPU/RAM can't take it.
 
thanks very much - as I said its very severe crashing wise anything over 401

interesting that it hangs sometimes as soon as you press F10 to save and exit bios ...

Mark.
 
some extra details

currently on 1.9-1.95V Vdimm

RAM is Corsair 6400 C5 (PROMOS :( ) - doesn't like volts at all

CPU = 6600 - Week 24 - not great overclocker, but will do 3.33 @ 1.5V (bios)

have C1E and EIST disabled
USB Legacy off

all Motherboard Volts at Auto

CPU @ 1.5V @ 3.33 gig is about 56C load (TAT) and 42C idle - so I don't think temps are my probem

is your GEIL the "standard" C4 stuff ? I may be tempted as its very cheap now - my Corsair is very poor - currently running it at 700MHz (1:1) - C4 - which its fine at.
 
I'm not using GeIL, I'm using G.Skill HZ which I think uses micron chips.

This is CAS4 memory though yeah, currently running it at 940MHz 4-4-4-12 2.0v.
 
i have the same problem except my board doesnt even go past 350 tried many fsb's between 400-500 but the system either wont boot or fails orthos. also most of the time when booting up it claims there's no keyboard plugged detected so you cant get into the bios making it a nightmare to overclock. overall i'm sorely dissapointed in this board and have given up trying to clock it
 
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