AMD 1.4/266 and A7V

[Lancelot2]

My Bios version is 1008.
I have the original A7V (FSB max stable speed =105)
I have just bought a Athlon 1.4/266.
With no mods(pencil trick), it boots and runs fine in jumper mode at 1100(10.5x105).

But I'm trying to find out if I can run this chip higher without modifying the L1 bridges, by putting my Bios in "jumper free mode" and then changing the multiplier to 12.5x105. Will this work or do I "have" to unlock the bridges on the CPU?

Thanks

[araaraara]

I'm pretty sure the 1.2 - 1.4ghz thunderbirds were unlocked, meaning you can set the multiplier through software(BIOS). You might as well try it because if the chip is unlocked, it will run at the higher speed, if it is locked, it will stay at its current speed and ignore the change in multiplier.

[Lancelot2]

araaraara
No go, the chip is locked as I did go into jumper free mode and tried various multipliers with no success. I was able to raise the bus speed to 109 stable so at least I now get 1144.

Thanks.

[Terminator]

Am i reading this right?
Your have a 1.4GHz 266FSB T-bird running in the original A7V which is only meant to run at 200FSB?
This is very interesting because I posted a question on wether they would run AT ALL at reduced FSB from 266 and was told it would not work at all!!!
Reason I'm asking is 200FSB T-birds are getting very rare and in most cases the 266FSB is cheaper.
Most I've pushed the FSB stable is to 110(220)MHz by the way.

By the way unlocking with the pencil is dead easy. If you do and clock it at 12.5x110FSB you will get 1375MHz which is making the most of your cpu.

T

[Imperion1]

Terminator, who ever told you that you couldn't run a cpu w/ 266fsb on a mobo that only supports 200fsb is wrong.
I ran my Tbird 1G (266) on the original Abit KT7 Raid mobo (200fsb) for a couple of months before I picked up a new mobo to support the 266fsb.

A 1.4G (266fsb) cpu would run @ 1050 on a mobo that supports 200fsb only.
1.4 266fsb is 10.5x133 = 1396.5 or 1.4G (it rounds up)
1.4 200fsb is 10.5x100 = 1050 or 1.05G

[Terminator]

TYVM Imperion

I thought it would work as well just wanted to see if anyone had actually done it.

Can see my flexible friend being abused soon


T

[Lancelot2]

Terminator
Yes the 266 works great on my A7V and by the way my Bios in jumper free mode does offer the 12.5 multilier as well as the 5/13x multiplier so if I do the pencil trick I should be able to get 13x109 which all of a sudden is a pretty good result. But as I said even though thousands of people have done the pencil trick, it still looks like a very figety job but I will give it a crack one of these days.

Also one other positive about this chip in jumper mode is that I can now run the V-core at 1.7 instead of 1.75.,(much cooler).

My bus will run as high as 114 in windows applications but as soon as I fire up a 3d game it will freeze so I'm not sure if its the ram that can't handle the speed, or my AGP video card or the Kt133 chip itself that just can go past 109 in games.

TBird 1400c@1145(AYHJA-Y)-JustCooler P-8000 Fan,
Bus@109,JumperFreeMode@1.70V-Core
A7V(rev 1.01)-(Bios Gone Back To 1008)
Temps: room 75f(-CPU idle/36 load/39) -Mobo32
Mitsubishi Diamond View 19" Diamondtron NF Monitor
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256 Meg PC166 Hyundai Ram(3-2-2)
Kyro2 TV out 64 meg@179
1 PCI Slot cooler "Exhaust"
Lower Front Case Intake Fan and a
90mm side case exhaust fan
Medium fan blowing across rear of Kyro2
Just Cooler HD-100 Hard Drive Cooling Kit
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WD30gig ATA100 7200RPM Hard Drive
(on the Promise Controller)
2x8 gig WD UDMA66 5400RPM Hard Drives(Primary IDE)
Sony CD-RW CRX 140E 8 Speed Burner
Creative PC-DVDx4.8 Rom Drive
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3C90x Fast EtherLink XL/EtherLink XL PCI BM NIC
MX300 Aureal Sound(2050 Aureal Drivers)
Powered Energy Saver 4 port USB Hub
Cambridge SoundWorks 4 point Surround Sound
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Triple Booting Win98SE, Win2000 and WinXP Pro
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Q3,Q2,SOF,Rune,SeriousSam,HeavyMetalFakk2,MaxPayne ,
Wolfenstein,Revolt,AdventurePinball,DXBall-1+2,
SeriousSamSecondEncounter,AVP2.

[araaraara]

It's probably the kt133 chipset that doesn't like being pushed to 144mhz. I've heard that most people get 110mhz max out of that chipset (under normal circumstances ). Your only option now is to unlock that multiplier and get clockin' crazy!

The only difference between a 200mhz FSB T-Bird and a 266mhz T-Bird is the multiplier, although the 266mhz one MAY be of slightly higher quality because it can take the higher FSB at stock settings(voltage), but that's a pretty big guess on my part.

[JeffD]

Let me second araaraara's comment.

The KT133 chipset was only rated for 100MHz FSb....not 133. Consequently, anything over 105fsb was considered a good overclock for these boards......so it's likely the motherboard chipset and not your ram or cpu that is holding you back.

Regards,

JeffD