AMD Mobiles, Epox 8rda+ & the 12.5 multiplier limit

[Bigjakkstaffa]

From what i'm reading, it appears the 8rda+ is limited to a maximum of 12.5x multi on newer CPU's as a result of it using 4 bits (as opposed to 5) to calculate its multiplier settings.

This rather SNAFU's my plans to get an XP2500-M and o/c it senseless, as im somewhat FSB limited (i cant consistently do over 166MHz) and rely on the multi. Presently i'm running an XP2400+ at 166x14 with no problems.

As such, is there any way around this imposed Multiplier limit? I am aware that software applications can be used, but i would prefer to set the multi in the bios. Likewise i am aware of a pin-mod to unlock 5-Bit multipliers, however im not sure of the specifics or if its 100% guaranteed to work.

This all seems right odd to me seeing as im allowed to choose from 1-24x multi with no fuss on my ol' XP2400+, but thats life.

Many thanks

--Jakk:t

[Someone Stupid]

I still thought the 2500 M's were locked at 12.5 as the upper limit, just giving you headroom.

[RamonGTP]

Thats what I thought as well.... I'll have to try >12.5 multi on my NF7-S and see if it accepts it.

[Bigjakkstaffa]

http://www.ocforums.com/showthread.php?t=279392&page=1&pp=30

It seems that on certian Nforce 2 boards which use the 4-Bit system they are limited to 12.5x. Apparently the L12 pin trick unlocks from 12.5-24x (but removed any below that figure). I've also read that by paiting one of the L5 bridges on the CPU you can unlock all mutli's from 3-24x:

http://www.ocworkbench.com/2004/guides/unlockwk43update/ocw_unlocking_xp39+.html

http://forums.pcper.com/showthread.php?t=254737&page=1&pp=15

--Jakk:t

[Bigjakkstaffa]

Seems the bridge joining wont work on the 8rda+ (so i'm told) so looks like the wire trick is my only choice :( (if i even bother getting the CPU now).

Essentially this is a BIOS issue, a hacked or third party BIOS could open up the full range of multi's no problem...just nobody's bothered to write one. One guy has even stated that on old BIOS versions the problem doesnt exist at all, and that it's been added more recently.

God i hate fannying about with mods like this..

--Jakk:t

[RamonGTP]

How about a relatively simple VDD mod so you can get to 200fsb?

[Bigjakkstaffa]

Nah, i've got all the gear, but its just too fiddly for an oaf like me even worse my soldering skills are hillariously bad, i'd probably end up soldering mysefl to the board,

In contrast the "Wire trick" for the multipliers is "simply" a case of finding a thin piece of wire (im gonna take one out of an old IDE cable), bending it into a U shape and briding two of the holes in the socket, shoudl be easy enough... i'll have to have my glasses on mind you :cool:

--Jakk:t

[Smagma]

should have looked one more time before posting my question :rolleyes:

looks like you can convert a desktop XP to a mobile and get multis up to 24 just by painting the 2nd and 3rd L5 bridges. I could probably do that with a big magnifier and my glasses :D

Well, I guess most of my question(s) are still unanswerd. I'll keep an eye on my thread and this.

Later

Smagma :t

[RamonGTP]

You may be able to unlock the multi on the desktop versions, but the nice thing about the mobile is that they tend to overclock a lot higher.

[Smagma]

Highers is Better :x

Smagma :t

[Happy Joe]

I tried the wire trick on my a7n8x with my mobile... no go. I have heard that some people need to try it several times, probably just a matter of getting good contact.
Enjoy!
PS I have yet to see anyone abel to consistantly unlock locked bartons... even by converting the jumpers to make them think that they are mobiles.

[dragflameson]

Originally posted by RamonGTP
the nice thing about the mobile is that they tend to overclock a lot higher. They run stock at 1.45V! Thats pretty awesome... anyone wanting to o/c a barton *better* get a mobile, it would be stupid not to! NTM all the newer mobile's are unlocked so there's no risk trying to unlock them and with the L12 Mod you can make them run default at 166 from 133 on top of it.

Bigjakkstaffa, I havent been able to get my mobile to boot at over 12.5 multi, so if you are that limited by FSB maybe you shouldnt go mobile :(

In contrast the "Wire trick" for the multipliers is "simply" a case of finding a thin piece of wire (im gonna take one out of an old IDE cable), bending it into a U shape and briding two of the holes in the socket, shoudl be easy enough... i'll have to have my glasses on mind you Honestly, try speaker wire. If you dont have any pick up a nice short peice of subwoofer speaker wire at a store like Tweater or Circut City where they sell car audio speakers and strip it and use one strand, if thats too thin (which it probably would be) then twist two strands together. Thats what I did for my L12 Mod ;)