Over clocking........(can you do it)
08 January 2002, 09:31 PM
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Calling all you computer geeks 
(you know who you are!)
I've a KT7A mother Board and I've been told you can over clock the processor by altering the BIOS settings, but which part do you change?
The Crack
(you know who you are!)I've a KT7A mother Board and I've been told you can over clock the processor by altering the BIOS settings, but which part do you change?
The Crack
08 January 2002, 10:31 PM
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Crackerjack 
Have a look here http://www.viahardware.com/faq/kt7/kt7faq.htm
A bible for KT7/7A users.
Should have what you need in the overclocking section.....
Have a look here http://www.viahardware.com/faq/kt7/kt7faq.htm
A bible for KT7/7A users.
Should have what you need in the overclocking section.....
08 January 2002, 10:39 PM
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2 different ways of doing it.....
Multiplier overclocking, (9x133,9.5x133,10x133, etc,etc)
FSB (Front Side Bus) overclocking.
The first is the best choice for overall stabilty, as you are keeping the speed of the general components at normal settings, but you need to physically alter Athlon and Duron chips to 'Unlock the multiplier'. Easy to do for someone not scared of delicate job, but not advisable for non-perfectionists....
(the multiplier is by no means infinite, there are limits as to what multiplier you can obtain per chip). From memory,for the original Athlon Thunderbirds, I have not come across any that can do more than 11.5X to 12X. Those are very refined-core Thunderbirds('AYHJA' core etc)
The second is FSB overclocking. Instead of upping the multiplier of the CPU, you ramp up the FSB speed. This is the choice of the hardcore when trying to achieve silly overclocks, but very risky for overall stability/life of the system.
The Bus speeds of different components vary in your system, but are all linked, as in if you speed up 1 Bus, the others increase proportionally. Example:
Modern, 133Mhz-Based Motherboard.
Bus Speed of CPU - 133Mhz
Bus Speed of AGP (Graphics) Port - 66.6Mhz (Add to that the AGP Multiplers, 2X, 4X)
Bus Speed of USB Ports - 48Mhz
Bus Speed of PCI Slots - 33.3Mhz (Soundcard, int. Modem, LAN, IDE, etc)
If you increase the FSB of the CPU to say 140Mhz, this alters the others to the following:
AGP - 70Mhz (140@2X, 280@4X)
USB - 50Mhz (Approx and seems to stay at 48Mhz according to Sisift Sandra....)
PCI - 35Mhz
Running the buses at these speeds are outside the recommended tolerences for the above, but also the types of cards being used in the slots. More heat will be generated by all peripherals within the machine. Some cards will simply not handle it and work incorrectly/die. Most peripheral cards nowadays are OK at the 140Mhz FSB, but the higher you go, the more unreliable/ risky things become.
Also, to aid stability when running thing over their tolerences, you may well need to feed more current to the CPU/AGP/PCI slots, again risking component death and reduction of part life.
If you want to do it this way, then be warned......... Good cooling at the very least is a necessity.
Never one to over clock the fsb by choice, but overclock practically every computer that I have owned.
Old machine:
Abit KT7A Series
Athlon 'Axia' 1Ghz(7.5x133)@1.4Ghz(10.5x133)
Current Machine:
Epox 8KHA+
Athlon XP1900(1600Mhz,12x133)@XP2100(1737Mhz,12.5x139)
If you don't need the hassle, then don't bother mate, if you are happy with it.
Top Class heatsink and fan are an absolute necessity@ at least £30.
Cheers,
Nick
P.S, probably forgotten a few bits on here, but enough to get you thinking
Multiplier overclocking, (9x133,9.5x133,10x133, etc,etc)
FSB (Front Side Bus) overclocking.
The first is the best choice for overall stabilty, as you are keeping the speed of the general components at normal settings, but you need to physically alter Athlon and Duron chips to 'Unlock the multiplier'. Easy to do for someone not scared of delicate job, but not advisable for non-perfectionists....
(the multiplier is by no means infinite, there are limits as to what multiplier you can obtain per chip). From memory,for the original Athlon Thunderbirds, I have not come across any that can do more than 11.5X to 12X. Those are very refined-core Thunderbirds('AYHJA' core etc)
The second is FSB overclocking. Instead of upping the multiplier of the CPU, you ramp up the FSB speed. This is the choice of the hardcore when trying to achieve silly overclocks, but very risky for overall stability/life of the system.
The Bus speeds of different components vary in your system, but are all linked, as in if you speed up 1 Bus, the others increase proportionally. Example:
Modern, 133Mhz-Based Motherboard.
Bus Speed of CPU - 133Mhz
Bus Speed of AGP (Graphics) Port - 66.6Mhz (Add to that the AGP Multiplers, 2X, 4X)
Bus Speed of USB Ports - 48Mhz
Bus Speed of PCI Slots - 33.3Mhz (Soundcard, int. Modem, LAN, IDE, etc)
If you increase the FSB of the CPU to say 140Mhz, this alters the others to the following:
AGP - 70Mhz (140@2X, 280@4X)
USB - 50Mhz (Approx and seems to stay at 48Mhz according to Sisift Sandra....)
PCI - 35Mhz
Running the buses at these speeds are outside the recommended tolerences for the above, but also the types of cards being used in the slots. More heat will be generated by all peripherals within the machine. Some cards will simply not handle it and work incorrectly/die. Most peripheral cards nowadays are OK at the 140Mhz FSB, but the higher you go, the more unreliable/ risky things become.
Also, to aid stability when running thing over their tolerences, you may well need to feed more current to the CPU/AGP/PCI slots, again risking component death and reduction of part life.
If you want to do it this way, then be warned......... Good cooling at the very least is a necessity.
Never one to over clock the fsb by choice, but overclock practically every computer that I have owned.
Old machine:
Abit KT7A Series
Athlon 'Axia' 1Ghz(7.5x133)@1.4Ghz(10.5x133)
Current Machine:
Epox 8KHA+
Athlon XP1900(1600Mhz,12x133)@XP2100(1737Mhz,12.5x139)
If you don't need the hassle, then don't bother mate, if you are happy with it.
Top Class heatsink and fan are an absolute necessity@ at least £30.
Cheers,
Nick
P.S, probably forgotten a few bits on here, but enough to get you thinking
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11 January 2002, 09:44 PM
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I've modded all of mine thunderbird-cored ones the same way too. Good lighting conditions necessary, good eyesight, good pencil and very sharp as mentioned.
Best way to keep sharp while modding is to have a sheet of A4 handy and fairly often rub the pencil along the paper whilsttwirling it. Produces the toughest sharp point possible. Sharpening not accurate enough for an easy job and makes the point brittle.
Locate the L1 bridges which will be directly to the right if memory serves and look like the following ::::
join each line together top to bottom, but make 100% sure that each line does not touch the other at all. When in doubt, rub them out!
Will end up looking like this: |||| .Simple as that
.
With all of mine, I firmly placed one of those little round coloured paper sticker dots on the top (Can't describe well) of the lines for protection. Make sure you don't move the sticker when placing it. I do this to preserve the connections as over time, the lines normally decay. I have been doignthem this way for over a year now and have not had to redo a single chip or correct any either. All right first time, with a little precision and patience...
Cheers,
Nick.
Best way to keep sharp while modding is to have a sheet of A4 handy and fairly often rub the pencil along the paper whilsttwirling it. Produces the toughest sharp point possible. Sharpening not accurate enough for an easy job and makes the point brittle.
Locate the L1 bridges which will be directly to the right if memory serves and look like the following ::::
join each line together top to bottom, but make 100% sure that each line does not touch the other at all. When in doubt, rub them out!
Will end up looking like this: |||| .Simple as that
.With all of mine, I firmly placed one of those little round coloured paper sticker dots on the top (Can't describe well) of the lines for protection. Make sure you don't move the sticker when placing it. I do this to preserve the connections as over time, the lines normally decay. I have been doignthem this way for over a year now and have not had to redo a single chip or correct any either. All right first time, with a little precision and patience...
Cheers,
Nick.
11 January 2002, 09:55 PM
#10
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You saying that you went from a 7.5 multiplier to a 12.5 multiplier? Or from a 7.5x100 to approx 9.5x133? If 12.5 multiplier then bloody well done. Right on AMD's limit for Thunderbird core multiplier if not above.
Cheers,
Nick
Cheers,
Nick
