Could be. I'm just going off what tools/benches read/showed. They were afterall synthetic benches which showed it much faster, so it could be "untrue" of the original NB frequency. It only happened on a day or two, never happend agian. If I chose the settings again, no POST. I booted at a few similar settings.

RAM was in single channel those days. This is how the pattern went.


Compare Cinebench10:
2640/1920HT/1920NB/480/4-4-4-4-24 1T tRFC 75ns dual channel: 2214 / 8448


2640/2160HT/3120NB/480/5-5-5-5-24 2T tRFC 105ns single channel: 2235 / 8456


Booted:
HT ref. 200
HT LInk 9x 1800MHz
HT Fre. 1800MHz
CPU FID 06
CPU DID 1
CPU VID 28
CPU Fre. 2200MHz
NB FID 09
NB DID 1
NB VID 36
NB Fre. 2600MHz

Then I just AOD'd upwards and it went up along with HT/CPU/RAM IIRC. But I did the same a few times at different MHz those days.