865PE NEO-2 wouldn't boot on high performance settings

this is my configuration:
- 865PE NEO-2-S
- P4 2.4Mhz, NorthWood, 800FSB
- MICRON,  2 x 256MB DDR, 400MHZ, in dual channel configuarion  (512 total)
  CAS#: 2.5 clocks
  RAS# to CAS# Delay: 2.5 clocks
  RAS# Precharge: 4 clocks
  Cycle TIME:  8 clocks
- Hercules ATI RADEON 9800PRO 128Mb ram.
  with latest bios and drivers
Bios is flashed to the latest version (v2.50)
THE PROBLEM:
My system wouldn't run on anything higher the SLOW setting
in the "Frequency/Voltage Control Performance Mode" menu in the BIOS.
when i set it to 'fast' or 'turbo', my WindowsXP crashes.
when i set it to 'ultra turbo', it wouldn't even boot.
(i had to reset it several times till it became SLOW mode again)
when i tried to run the system with Windows98SE, the system freezes.
(on anything else than SLOW)
I have no idea what the problem is.
is there a problem with the board?
(when i try to manualy overclock it, it's stable on 205 FSB)

that PAT/MAT not guaranteed to work on 865PE chipset (manufacturer make it possible, but Intel not guarantee it).
Btw, it's specifically work with RAM. So I think it's your RAM which can't handle.
(I think) On stock FSB, most RAM stable with Fast, some with Turbo, and rare with Ultra Turbo (under FSB 218, full PAT limit). But some can't run other than Slow (or Normal in some boards).
Quote
  CAS#: 2.5 clocks
  RAS# to CAS# Delay: 2.5 clocks   --> is it not 3 or 4?
  RAS# Precharge: 4 clocks
  Cycle TIME:  8 clocks
(when i try to manualy overclock it, it's stable on 205 FSB)
Then, it's clear that your RAM isn't high performance RAM and maybe not capable to handle PAT.
But, still 205 FSB is kinda low, you can try crank your vdimm to around 2.75 to 2.85 (watch your RAM warranty). -and maybe you get better stability on PAT-
For value RAM maybe -it's can be different- you can expect 210-220 (with loose timing).

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