Athlon XP 2400+ shows 1800+ on boot

[scorpio5780]

Hi

I just bought a MSI KT4 Ultra (6590) motherboard, AMD Athlon XP 2400+, and PC2100 512 MB RAM.
After building the machine I installed the OS and everything. But realized that at Boot screen shows my processor to be 1800+.
My friend told me to overclock the CPU according to the specification of the CPU and motherboard.
I installed CPU overclocking software provided by the motherboard in windows. The software showed that the CPU is running at 1500. The software had AUTOconfigure procedure which I ran and after that machine started runing at 1765. The CPU FSB achieved was 118 (was 100 earlier).
I checked the BIOS. There were options to change the CPU FSB, CPU voltage, RAM frequency, RAM voltage, AGP voltage etc.
I change the values of
CPU FSB = 266 (default was 100)
RAM frequency = 266 (default was 100)

After saving the changes in BIOS, the machine didn't boot.
I had to clear the CMOS using jumper settings. The machine booted with default BIOS settings. (sigh of relief, it wasn't dead)

After that I tried overclocking using manual setup of the software provided by the motherboard vendor. I increased the CPU FSB to 125 and applied the changes - The machine froze. I resetted my machine and nothing was roasted.

Now my machine is running at 1765 MHz with CPU FSB of 118 and still shows 1800+ at bootup.
I checked the mother board specs - it supports till AMD Athlon XP 2700+ and support CPU FSB 266. And the CPU also supports 266 FSB.

Questions
1. Is the CPU AMD Athlon 2400+? I am asking this bcos its showing 1800+.
2. Do I need to do something different to make it work at 2400+.

If anybody knows how to make things working accoding to the vedor's specification, please reply.
Appreciate your help.

 

[Macro2]

Change your FSB to 133. Same for memory. Save and exit.

 

[Macro2]

It's also possible you damaged something. A double overclock 266 is pretty extreme.

Mac

 

[scorpio5780]

I change the setting to 266 because that was the specs on the CPU. And I saw the range of CPU FSB in front of option in BIOS... it was(100 - 280). So I guess no damage will be done as it can resist 266. Thats my guess.

 

[scorpio5780]

I changed the CPU FSB to 133 in the BIOS. And now the boot screen shows 2400+ CPU now. And when I ran the Autoconfigure process in windows, the FSB reached 145. And now the machine is running at 2148 GHz. Fast enough for to satusfy me
One last quick question. When the CPU and the motherboard specs says that it can go at 266 then why they are not happy with 266 FSB value?
And what does 2400+ signifies? is this the speed that CPU can achieve?

Thanks for your help MACRO2.

 

[Macro2]

Because when the specs say 266 Mhz bus this is acheived by double pumping a 133 Mhz bus (2x133). You set to 133 Mhz not 266. PC2100 memory is only certified to 133 Mhz.
The clockspeed of your cpu is determined by the multiplier times the FSB speed.
In your case the speed of your chip (in spec) is 15 x 133 = 2000 Mhz...at 145 you are overclocking to 2175. How high you can overclock depends on several things one of which is the RAM you are using. PC2100 specs out ot 133 so anything over that is gravy. Some brands will go up over 166 some will go higher. PC2700 is spec-ed at 166 most will go a little higher. From there you can buy PC3200 RAM and PC3500 I think. Other factors include heat, voltage, RAM timing, whether some of your peripherals and their buses can run asynchrously etc.

When you set the FSB to 266 you were trying to run the system at 3990 Mhz. So it just crashed.
Luckily it didn't hurt anything.


If you are running stable 2175 then leave it there. You were right to inch it up from 133.

2400+ is a rating given the chip by AMD. Supposedly it compares the chip to the older thunderbird core chip that AMD made but it also makes comparison to Intel P4 Northwood chips. 2400+ being approx equal to a 2400 Mhz (2.4 Ghz)Intel P4. They had to do this because unknowing consumers would just base there purchasing on raw Mhz numbers rather than performance.

I've worked on 2400 Mhz (2.4 Ghz) P4 systems and I'm on a 2400+ right now and I can tell you you made a wise choice with the AMD chip.

Mac

 

[scorpio5780]

Thanx.
that was enlightening.