Abit unlocked my xp2400

[Montee]

ok this is wierd. I have an 0346 xp2400/266. which is a locked chip. I've tried it in different Mb's and yes it is locked ( no multiplier control in bois) I picked up a new MB ABit nf7-s ver2.
I put the chip in and boot it up and i now have control of the multiplier in the bios. I've changed the multiplier to see if it would change my mhz and it does. I've checked it in wcpuid ! I've tried several multiplers in the bios and everyone worked. Many people said this is not possible, well what can i say it works. I've looked for some reason for this and this is what i found at the abit web site

ABIT MaxFID (Max Frequency ID) Technology is a special designed for ABIT K7 series MB. With unique ABIT RD engineering, MaxFID Technology can support extra 16 sets parameters to determine the AMD CPU multiplier. Unlike other manufactories, users can not only OC by FSB, but also adjust CPU’s multipliers through ABIT MaxFID to get a best performance platform. However, this wonderful feature only works when users adopt AMD AthlonXP CPU with ABIT K7 motherboard.

What is 4-bit FID?

CPU’s Frequency equals FSB times Multipliers, we can choice 100MHz or 133 MHz by CPU’s FSB to boot up your PC, and you could get an operation frequency by CPU’s FSB times its default multiplier. So when you get a CPU is AMD K7 1.2G (133MHz x 9 = 1198MHz), that means the CPU default multiplier is 9 by 4-bit FID: [1100]. FID just is a binary number to define the Multiplier by 4-bit as table below:

4-bit FID Multiplier 4-bit FID Multiplier 4-bit FID Multiplier 4-bit FID Multiplier
0000 11 0100 5 1000 7 1100 9
0001 11.5 0101 5.5 1001 7.5 1101 9.5
0010 12 0110 6 1010 8 1110 10
0011 12.5 0111 6.5 1011 8.5 1111 10.5

But in 4-bit FID only MB, we can not find a FID setting over 12.5, if user gets a CPU has a multiplier higher than 12.5, the CPU will run at default multiplier and only can OC by FSB.

How does Max FID operate?

For ABIT K7 series M/B, we provide 5th bit FID to determine extra 16 sets CPU multipliers, as follow table:

MaxFID Multiplier MaxFID Multiplier
10000 3 11000 15
10001 19 11001 22
10010 4 11010 16
10011 20 11011 16.5
10100 16 11100 17
10101 13.5 11101 18
10110 14 11110 NA

So when you get a AMD CPU which has a multiplier higher than 12.5, you could adjust not only FSB from 100MHz up to 250MHz, but also CPU’s multiplier by ABIT MaxFID.

What benefit can user get from Max FID Override?

By ABIT MaxFID Override technology, users can get variety of CPU over-clocking sets. For example, if users get a AMD Athlon XP 2400+ CPU by 133MHz (FSB) x 15(Multiplier) = 2000MHz (CPU/DDR=133/166), That means users only can adjust the FSB to get an OC performance without MaxFID override technology. Such as: 150MHz (FSB) x 15(Multiplier) = 2250MHz (CPU/DDR=150/150), by CPU’s frequency limited. Otherwise users can adjust the frequency through MaxFID override by 166MHz (FSB) x 12(Multiplier) = 2000MHz (CPU/DDR=166/166) or 100MHz (FSB) x 20(Multiplier) = 2000MHz (CPU/DDR=100/100) to gain a best performance platform.

so what can i say it worked on my chip
Montee

 

[OC Detective]

If the cpu was genuinely factory locked then your Abit mobo does not unlock it period. Abit have had 5 bit FID on their mobos for some time and plenty people have used them on superlocked cpu's and dont have access to the multis. The benefit of 5bit FID's over 4 bit FID's is that they can recognise multis over 12.5 without manipulation. However 4 bit FIDS can still manipulate factory unlocked cpus with multis lower than 12.5. Your problem was you were using mobos which had 4 FIDs only and the default multi on your cpu is I think 16 so it could not manipulate them without adjustment to the cpu itself. Now you have a 5 bit mobo it can handle the 8x bit of the multi. However the cpu you have is definitely unlocked.

 

[Mr_Obvious]

Like the detective said, your old MB's just didn't have the feature for an unlocked cpu. Your comparing Banana's to oranges between a k7 and a nf7. With a K7, even with the L1 multi unlocked, its still only going to see the multi settings on the L3 or L4 bridges. (depending on cpu series)