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Questions about unlocking/over-clocking Athlon XP's (in SMP)

B

BatmanNate

Lifer
I would like to upgrade the pair of 1500+ XP's I have running in my Tyan Tiger setup. My question, is what is the highest processors that are supported by this board? T-breds? Bartons? Is voltage a factor here?

Also, the pair of XP's I have in there now aren't modified. I've heard that with newer XP CPU's you have to modify them to run in dual. Is this correct? Which CPU's are affected?

Overclocking probably isn't an option as the board has a AMD 760 chipset and is pretty old with few OC options, but if I was interested in doing so how would I modify the multiplier in order to do so on said newer CPU's?

Any help would be appreciated, I've been out of the game for a little bit. 🙂

(i've been thinking about a pair of 2400+'s)
 
Also, the pair of XP's I have in there now aren't modified. I've heard that with newer XP CPU's you have to modify them to run in dual. Is this correct? Which CPU's are affected?
Click to expand...
If you plan to use XP chips, they must be SMP unlocked. Most of the newer XP chips (manufactured since probably January or so) are all SMP locked. In order to SMP unlock a chip you must modify the L5 bridges. It is a fairly easy task to do since only one of the L5 bridges must be closed.


Edit: I also believe the Tyan board only supports up to 1900+.
 
Originally posted by: minendo
Also, the pair of XP's I have in there now aren't modified. I've heard that with newer XP CPU's you have to modify them to run in dual. Is this correct? Which CPU's are affected?
Click to expand...
If you plan to use XP chips, they must be SMP unlocked. Most of the newer XP chips (manufactured since probably January or so) are all SMP locked. In order to SMP unlock a chip you must modify the L5 bridges. It is a fairly easy task to do since only one of the L5 bridges must be closed.


Edit: I also believe the Tyan board only supports up to 1900+.
Click to expand...


So you're saying that only one chip needs to be modified? Does the old rear window defroster pen still work? I'm scouring for info on the 1900 thing right now, I've heard conflicting reports on that. Thanks for the help!
 
Originally posted by: BatmanNate
So you're saying that only one chip needs to be modified? Does the old rear window defroster pen still work? I'm scouring for info on the 1900 thing right now, I've heard conflicting reports on that. Thanks for the help!
Click to expand...
Both chips would need to be modified, but the L5 bridges contain three or four gaps. Only one of those gaps has to be filled per chip in order to run them in dual mode.

Unlocking smp mode is carried out in the same way as unlocking the multiplier.

 
Originally posted by: minendo
Originally posted by: BatmanNate
So you're saying that only one chip needs to be modified? Does the old rear window defroster pen still work? I'm scouring for info on the 1900 thing right now, I've heard conflicting reports on that. Thanks for the help!
Click to expand...
Both chips would need to be modified, but the L5 bridges contain three or four gaps. Only one of those gaps has to be filled per chip in order to run them in dual mode.

Unlocking smp mode is carried out in the same way as unlocking the multiplier.
Click to expand...

Got it. Which bridge is cut to unlock the the multiplier?

I checked around on 2cpu.com and according to Tyan, the board supports up to 1900+, however many people are running tbreds and faster CPU's on the board. However, there exists a problem with burning out the ATX power connector when doing so. :Q Probably not worth the risk.
 
Originally posted by: BatmanNate
Got it. Which bridge is cut to unlock the the multiplier?
Click to expand...
The bridge you want to close on the L5 is the outermost cut one. There should be three cut bridges on a smp locked chip - the middle two and one outside one. Close the outside one.

 
Originally posted by: minendo
Turning the Athlon XP into an "MP"
Click to expand...

Cool, thanks for the help.


A question on the multipliers, if I were to buy a pair of 1700+'s and want to crank up the multiplier (since my boards does not have the option) is there a way to physically do this on the chip? I have a pair of deltas with variable RPM controllers on there, so I wouldn't mind OCing a bit if I could find a way to do it.
 
Originally posted by: BatmanNate
Originally posted by: minendo
Turning the Athlon XP into an "MP"
Click to expand...

Cool, thanks for the help.


A question on the multipliers, if I were to buy a pair of 1700+'s and want to crank up the multiplier (since my boards does not have the option) is there a way to physically do this on the chip? I have a pair of deltas with variable RPM controllers on there, so I wouldn't mind OCing a bit if I could find a way to do it.
Click to expand...
I am pretty sure there is a way to hardlock the multiplier on the chips, but I am not sure. Looking into it now.
 
Here is the best collection of in depth information on Athlon XP modification I've found so far. To answer the questions of myself and others who may face this, here are some of the things that I've found:

- Bridging the L5 with rear window defogger pen works. The pit should not matter, if you're worried about it fill with superglue or similar substance.

- The Tyan 2640 is known to pull current for both CPU's from the 5v rail, which is why the ATX connector tends to burn up with some PSU's on higher speed processors. Technically, it supports up to 1900+ Palomino. The 2200+ Tbred draws the same current as the 2000+ Palomino, so it is to be assumed that Tbred's under 2200+ are a safe bet. People on 2CPU have successfully ran 2200+ Tbred's, so it is a YMMV but it is possible.

- The 1700+ Tbred is a great chip to try this out with, since it is about $40 and all the L1's are connected, so the multiplier can be hard modified by cutting them, or reconnecting with the defogger pen.

I am thinking about picking up a pair of the 1700+ Tbred's and trying for 2000+ or so, since that should be well within the safe range.


As for some further questions of my own, I am curious what the generally accepted safe operating tempurature is for Tbred XP's. I am running a pair of Globalwin WBK-38's with 7000 RPM black label deltas (cranked down with the POT's right now of course, I don't use that kind of cooling power on my 1500+'s) so should I expect to be able to hit near 2200+ or even 2400+ or is 1900-2000 more realistic? Lots of good info in this thread, keep it coming!
 
More questions:

On a Tbred 1700+ it is listed as having a 333 FSB. Will it run at 266? If so, do you have to crank up the multiplier to make it run at the correct speed?

What is the difference between the "A" and the "B"?? How can you tell by looking at it?

 
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