xp2400+ and multiplier

[baller02]

i' ve got my xp2400+ today :D

i've found out that i have full multiplier controll from 15 and up on my epox 8k3a+.
under 15 it doesn't work:(
that are the multipliers all non kt400 user have to choose in theire bios:
7=15
7,5=15,5
8=16
8,5=16,5
9=17
9,5=18

max overclock at the moment is 2330 mhz @1,95 vcore
with alpha pal 8045 and delta @ 7volt i have a temp of 45 c.

[candjac]

Originally posted by baller02
i've found out that i have full multiplier controll from 15 and up on my epox 8k3a+.
under 15 it doesn't work:(
that are the multipliers all non kt400 user have to choose in theire bios:
7=15
7,5=15,5
8=16
8,5=16,5
9=17
9,5=18


This is very interesting, but not "totally" surprising. If we interpret your post correctly, seems to say "you get 8X more than you set"...(17.5X internally reset to 18X explains the 9.5X/18X case). This has probably happened "on this mobo" because it might be unable to set the high/er Multipliers "directly from the bios".

But since the 8X Bit Value Signal Bus is set HI/Enabled by default, when the bios sends the "4 bit" lower Multipliers' HI/LO signals code to the CPU the "combined 5 bit code" resulting from 4 bits from the mobo plus the 5th 8X bit from the CPU by default gets the higher Multipliers.

And http://www.beachlink.com/candjac/index.htm "Multiplier Code" article confirms for example that code for 7X needs only to reset the 8X BV HI for the 15X Code. So not surprising in that regard.

Just a little bit surprising that some logic or timing issue somewhere in the bios or Northbridge did not result in a no post/no boot...as has not been uncommon with many other older mobo systems.

Thanks for the info...hope we interpreted your comments correctly.
John C.
Edit:- You can probably get all the lower Multipliers if you Ground/reset LO the 8X Bit Vlue Signal Bus. This can be done by "closing" the rightmost L3 bridge. Just make a conductive horseshoe shaped trace "around" its "pit". That way you won't get conductive material into the pit which makes a "permanent" ground more difficult to remove than just breaking the surface trace around the pit. See all other relevant articles to understand what's going on. If you want to be able to "switch" the 8X BV, then solder a wire to the AJ27 socket/back of mobo cpu socket. Then just ground to case gets a LO..removing ground gets back the default HI...no need to close the 5th L3. Grounding thru a 100 ohm resistor gives some current limiting protection in case of an accidental short circuit.

[baller02]

i've already closed the 5th L3 bridge an have now full controll of multipliers from 5-12,5.
but i'm unhappy that i can't use multiplier 13-15 if i let him factory default only multis 15-18 works:(

[tweaky]

Did you close it using the horseshoe method? If that worked then it great news for me, makes it easier and all :D

[baller02]

i closed the 5th L3 bridge with tipex and sll (silver ..).
now i have multis from 5 to 12,5!

now it runs with 186 fsb and 12,5 multiplier

[candjac]

Originally posted by baller02
i've already closed the 5th L3 bridge an have now full controll of multipliers from 5-12,5.
but i'm unhappy that i can't use multiplier 13-15 if i let him factory default only multis 15-18 works:(

Do you have from 5X thru 6X settings available in the bios?? Seems as though that's what you need, ( with the 5th L3 reopened) to get 13X, 13.5X and 14X, (14.5X is listed by AMD as "reserved")...just like 7X got 15X, 5X should get you 13X, etc.
John C.

[baller02]

i thought that too and tried it but it doesn't work:(

in epox bios multis 13,14,15 in real are 12.5, 5, 5.5 i tried this on my privious unlockt xp1800+

there are other tbred owner which say that only multi 15 and up work on theire 8k3a+ if the xp is untouched.

the abit kt400 boards, the asus a7v8x and a7v333 can use all multis from 13-22,5, i wonder why epox isn't able to provide us with the same.