Hi, I hope Jimmor or one of his followers is still around.

I read through virtually every thread and article on the internet on the topic, but there are no instructions, except for those provided by Jimmor:

However, as an example for a 6600 type bios with core threshold temp of 145 it is easier if using NiBiTor's hex editor you first look for the binary string '04100905'. Having found the string, the binary part you are after is the four bit string '1009' sandwitched between the '04' and '05'. Now to get the two bit binary value that equates to 145 decimal, you just take the first and fourth bits of '1' and '9' and transpose them to become hex value '91'.

So for instance to set 100C only requires the hex '91' to become '64'. Or to put it another way, change the original '04100905' string to '04400605' !!
I have several 6800 BIOS files and noticed that some have 125C and some (like the one using currently) 105C. Lets say hypothetically, that the temperature reported is not the actual temperature used for thermal trip (wouldn't be a surprise, since having seperate thermal diode is common practice on CPU). So, even though at most, I only hit 62C load, there may be some hotspot near the thermal trip kicking it in. So, I'm trying to modify core "slowdown threshold":

I have 105C, as seen in nvidia driver. So according to Jimmor instructions that would be 04900605h, where 96h is transposed 69h = 105C. Similarly, 125C should be, 04D00705, where D7h is transposed 7Dh = 125C.

However, I can't find either of these strings in my BIOS. Not surprising, his instructions were actually for a 6600, and I have 6800. Jimmor, if you're there.. can you shed some light on this.