Originally Posted by amd-dude
Trust me 2thache...listen to xd 1771...i had my chip as a B55 quad core and the mosfet temps rocketed to 60c+ underload, now i don't know what the highest temps for mosfets are but that seems hot to me so i backed it down to a dual core..pretty much the specs i have in my sig rig.
But I can only give you both sides of the coin its up to you to decide if its dangerous...so the above was the bad side...here is the good:
If you want to stay as a B55 chip and make the chip hit 4ghz + you most certainly need 1.5v running to the cpu, as a difference, the chip as a dual core at 4ghz will most certainly run at stock volts 1.38v.
In terms of fine tuning i would say the biggest jump in performance came when i increased the cpu-nb to 2800mhz and to get the nb stable at that speed i need 1.4v
I dont really mess with ram timings cause i never seem to get them right, all i did was speed my ram to 1600mhz from 133mhz, and my system runs pretty good with no bottlenecks as far as i can tell.
I think most people don't put direct air on their mosfets.
I dunno about 1.5, I got 3.8 at 1.4 (default VCore) and 4.0 at 1.425. Max stable CPU-NB was only 2400, but that's without touching any voltages from stock.
A couple interesting things: I compared performance at 2400NB vs 2600NB, and 5-5-5-15@DDR2 800 vs 4-4-4-12@DDR2 800 vs 5-5-5-15@DDR2 1066, biggest difference was only ~%5, in many cases no difference. Then I ran FSB at 217x18 (to stay at 3900) and performance was again virtually identical to the other settings.
My biggest problem? Cool and Quiet will not enable. It must be forced off by overclocking with this board. That kind of sucks. I'd rather not OC by FSB 'cause I don't want to touch voltages much. I'll have to poke around and see if a newer BIOS changes anything with CnQ, but as-is I can't get it to work which is a real dissapointment.
The 555 BE is a surprisingly great chip though, I'm very impressed and I'm sure on another board it would go over 4.0 pretty easy.
On the downside, at 3.9 it's only 200 points higher 3dmark06 than my 3.6GHz Q6600 using the same GPU, at 500 less than the Q9550 at 3.7GHz with same card.Edited by 2thAche - 2/13/11 at 1:07am