motherboard crashing with LOWER multipliers - why?

[variokas]

I have:
DFI Infinity nF570-M2/G
AMD x2 4000+ (65nm)
2x1gb Corsair DDR800 DDR2 XMS2-6400 (matched pair)
Asus 8600GT

I managed to oc without changing voltage/cooling from 2,1ghz to 2,73ghz just by rasing htt speed from 200mhz to 260mhz. If tried to raise any more - system declined to boot. Then LOWERED htt multiplier from 5x to 4x - system haven't booted. Lowered ram multiplier (from 910mhz to 800mhz), system havent booted. Tried to raise cpu voltage to 1,45v and chipset to 1,5v and ram to 2,3v (stock is 2,1v), nothing helps. Whats going on?

 

[papasmurf211]

well why would u want to lower the multiplier? Also i have read something about FSB holes, its where your system dosnt like certain FSB's even when they are lower mhz and should be stable. Why dont u just return to the previous multiplier and use that oc. Also your cpu might not like being underclocked which it may be at those multipliers.

 

[iluvgillgill]

in your problem is not the FSB hole mention above since you only lowered the multiplier.this is like the problem with most AMD CPU when you lower the multiplier the system will crash or wrong speed read out in windows.i guess you will have to tweak other setting to see if the multiplier change have affected them. and i think you should not let the voltage on ram go any higher then 2.2v.because any higher is dangerous could cause damage and instability.ram is different to all other component,CPU/mobo/gpu etc will run more stable with more voltage at a higher speed.but this doesnt apply to ram.bare that in mind.

papasmurf211 if you want to know why people want to lower multiplier(if you not already know) is to get a higher FSB so the ram can run at TRUE OR NATIVE 800mhz or whatever speed he set it at.thats why overclock people once reach the higher overclock on the CPU they will lower the multiplier and further up the FSB to increase performance of the memory subsystem.