Few suggestions:

1. Lower down the HT Link Speed
2. Make the Command Rate to 2T

-pWs-

i think no need to lower down the HT Link Speed
Ram timing Command Rate (CR) set to 2T
maybe can at lil bit vdimm..1.90v or 1.95v
ur  ram  same as mine...team elite..but the timing i use is 5/5/5/16/19/2T

Are u still using the standard cooler?

performance wise, i think big typhoon is d best. 

if can sacrifice some performance for d sake of gettin a new cooler, i'll go for hyper tx 2 personally. 



source: x-bit labs. more HERE

if u really immune to noise, by all mean go for big typhoon, then get a higher cfm fan to replace d stock fan. u should have very gud load temp w/ that combo.

ot:
no sweat for d deal, u scratch my back & i scratch yas only... but i do agree that we owed bro -pWs- a big time... 

yup, i think it's d best among all those listed by u, even w/ d stock fan. 

i think big typhoon is the best cpu cooler.. i wonder which cooler can beat it with the same fan speed...
that's why i own it

Breast cancer??
Should be lung cancer right?

-pWs-

currently i run my htpc using the dblooi bulk F3 V2 processor.
before i just run it @1GHz becoz only using it for my xp mce. after upgraded it window vista ultimate it feel sluggish as hell.

and last night for the first time i run it at 3.2Ghz at 1.3volt with ht 3X. the oc process just take 5 min. I thought i just wanna make suicide shot consider that i dont have much time to play2 and overclock. and damn this proc rock man. i run stability test using AOD for 5Hour, and play MCE by the some time.. and fall asleep while watching TV3. i wake up by 12noon and found the computer still running......
the stability test completed without the problem.

so my point here is do u guys know whats this V2 capable of... i'm actually aretired overclocker my last overclock machine is socket 939. after that really busy to oc. for ur info i removed my XP90C becoz i cant fit it in my case. so i just overclock it using retail X2 4200 HSF. One more thing the AMD Powernow seem not working after oc it to 3.2GHz.. serious i dont need such power becoz i run this pc almost 24 Hr to record astro channel.

lots of people getting this 4600 F3.. does it clock better than F3 3800?

1.57V
Thats the maximum increament..I guess
Not Drastic?Hmm..Its 120x38mm thou..

3.5Ghz@ 1.5V?
Hmm..it load to 1.6V..Dont know wor
Btw,hows the temp when stressing?

CPU -VID hv lockup ..dont use auto , set it 1.25v

AX78 bios no hv this option ??

Just check AX78 manual  .....comfirm no hv CPU-VID option   , cannot help with it sorry 

Normal CPU Vcore ..i think is this 1

Becareful with the mobo....it doesn't support 125W. I think 3.48GHz at that vcore is nearly (if not exceeding) 125W d

1.6v is too high imo.. try to use less than 1.45v for 24/7, i mean when full load, not bios set..

imo, retail 4600+ f3 might do as well as those handpicked 3800+ by bro dblooi below 3.3GHz, but at higher MHz, 3800+ wins hands down. 
i dun quite agree with that mate, processors overclockability (at least amd chips) differ from batch to batch, it started that way even back in socket a era. 
psu & pwm not stable. psu cause by d capability of it, pwm cause by d heat. d higher d vcore, d hotter they get. try to cool 'em down. 
loosen timing means put 'em at more relax timing. for me, i'll settle for 5-5-5-x. 
nope, i dun think i have that in bios. abit is more simple when u compared it to biostar. biostar is more advance in bios, especially ram tweakin options. gosh... i miss my ta690g ledi... 
agree bro, it's not gud to push d board to its limit... later d mosfets can't take it and burn...   
i would be happy to get that kinda clock for 24/7, try 3.3GHz around 1.4v, from there start to lower down d vocre by doin more burn in. 
check ya +12v rail when ur primin, if it is fluctuatin very frequent, my advice is lower down ya vcore or.... get a better psu. 

Wah..Get a better PSU.Like Silverstone,Enermax..etc
If 1.45V@3.4Ghz enough lor if cannot push.Mine last time even 290x12 BIOS fail edy

my advice is try to bring down d voltage 1st @ 3.2GHz, as it's quite obvious that ya psu/board can't take too high vcore. from there slowly push it up w/o havin d need to add a lot vcore. seriously 3.2GHz is more than enough for 24/7. 
yas need what voltage in order to prime stable @ 3.4GHz bro???