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View Full Version : Trouble getting a high FBS OC out of my DFI nf4U


PaiN
04-05-05, 11:01 AM
Now that I figured out how to control CPU voltage on the DFI nf4U I've been able to get a decent OC, 12*220=2640 @ 1.7v, RAM(SPD) 1:1 2.7v, LDT 1.2v, HTT x5 1.6v(nf4) is what I'm currently running rock solid.

Here's the deal.....I can't seem to get operational going for a higher FBS, lower multi OC :(
for example: 11*236=2600 1.7v, RAM(SPD) 1:1 2.8v, LDT 1.3v, HTT x4 1.5v results in a hang on boot or if it boots, no USB function in XP.
I also tried afew other combos like: 10*260=2600 1.75v, RAM(SPD) 1:1 3.0v, LDT 1.3v, HTT x4 1.6v again hangs on boot, usually after APCI.
So, what gives? Seems strange that the CPU fails at a lower speed, because of an increased FBS(this isn't typical behavior). I'm thinking its either 1. USB or periph ports are over speeding(not locked), 2. the PCI-e bus is not locking or 3. the HTT multiplier is not dropping as I set it.

What do you think? Anything jumping out at you? Anyone know what "LDT" is or does?

The full specs are in my sig

Dr.Nick
04-06-05, 11:23 AM
Try to keep the HTT under 1000. I doubt even the DFI can handle anything higher

jAkUp
04-06-05, 11:55 AM
Yea try lowering your HTT to 3, and drop your memory ratio.

Riptide
04-06-05, 12:04 PM
PaiN, if you can't get it figured out you might go ask Sierra over on abxzone. the man is a guru. :)

BTW, as you prolly already know, HTT of 4x is fine at less than 250FSB.

PaiN
04-08-05, 03:34 PM
sorry I haen't been watching this thread.....
I have been working hard to get this resolved and figure out what was going on. To boil it down, my current RAM doesn't like to run up or in a-sync with this CPU......once I had the bios down I was able to divide out the RAM and get a solid 300x9 :cool:

If you're interested in the ugly details here's some links, the second link has CPU-z screens... :
http://forums.cluboverclocker.com/viewtopic.php?t=15376

http://forums.cluboverclocker.com/viewtopic.php?t=15414

alucard_x
04-09-05, 04:43 PM
There's a few things i don't understand about amd64 overclocking.

1. Can someone please explain how the HTT x# setting interacts with overclocking. and how it adds up to 1000mhz.

2. Isn't a bad idea to have the memory out of sync with the processor fsb? or does this act different because of how the memory controller is built into the cpu?

jAkUp
04-09-05, 05:42 PM
Take your FSB (200) x the default multiplyer (5x) and that gives you the HTT.

If you run a 250fsb, you would want to decrease your multiplyer to 4x

john19055
04-11-05, 02:09 AM
On a A64 CPU running the memory out of sync on a nforce3 dose'nt hurt the speed of it like it does on a nforce2 running a barton cpu out of sync.