Right, system spec first.
Leadtek nForce2 Ultra400 Delux Edition mobo
XP 1700+ DLT3C chip
2*256MB Corsair 3200 DDR RAM
SLK 800 + Vantec stealth fan
Got this up to 200*11 and it wasn't stable, have dropeed the multi down to 200*10 by now and it still isn't stable, Prime95 won't do the first test and 3DMark2001 crashes on the second test. Although doing stuff like browsing it stable e.t.c
My RAM timings are 2.5, 3, 3, 6 with 2.8V, CPU is at 1.75 and chipset voltage is 1.8V. Any ideas on how to get this stable?


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Great advice M@tt, it's always best to use small steps up and be sure to test thoroughly. Keep all voltages stock until there's a need for more. Simply jumping to a desired speed (which I assume happened) is not only very risky but difficult to ascertain the limitation(s).
DLT3C will use 1.50v, 1.65v is actually normal voltage for all TbredB and Barton so you can go straight to that if you wish. Then take your speed (as suggested) up one notch at a time (testing) until you get instability. You can then add 0.05v more voltage to see how much further it allows you to go IF you are definite cooling isn't the limitation. Adding voltage above the core norm produces a LOT more heat and will almost certainly have some negative effect on the CPU, so always monitor the actual true perf gains and see if you think they are worth it. Rem to run your RAM 1:1 with FSB and be sure you aren't using o/c'ed frequencies or timings for it as you want to isolate the CPU as much in order to find its limits.
As a final point you should check whether you have TbredA or TbredB, DLT3C can relate to both and TbredA is a very poor core due to lacking the extra layer.
KIUHB seem pretty new, AIUHB and JIUHB were the most common TbredB. TbredB always seemed to be happy at 400FSB+ but many early 400FSB capable mobos had problems running many Barton at 400FSB. Perhaps the KIUHB are marked as such because they can't do 400FSB but it's more likely just that particular CPU or perhaps another factor such as mobo (inc NB cooling), RAM (esp with tight timings), BIOS settings etc. Anyway the diffs between 333FSB and 400FSB aren't very big at all outside of synthetics so 'only' getting 380-390FSB is not going to limit you.