We have checked that right away when we started overclocking our Intel Core Duo T2600 CPU. By raising the Vcore just a little bit – up to 1.4V – we got our CPU to run at 2.6GHz set as 13x200MHz. Of course, we knew that this processor can do even better. However, AOpen i975Xa-YDG allows to continue CPU overclocking beyond 200MHz FSB frequency only after you perform a few tricks. Namely, you have to reset two jumpers on the mainboard PSB.
If you are an experienced overclocker, then you should remember the times when any CPU overclocking required resetting some jumpers. AOpen i975Xa-YDG gives us a great nostalgic experience: most contemporary mainboards hardly ever require working on the jumper settings during CPU overclocking. In our case it was not only a must if you wanted to proceed with processor overclocking beyond 200MHz FSB. It also required certain skill and sleight of hand. If the mainboard is installed into a system case, then you will have hard times reaching for the necessary jumpers located between the processor and the first PCI Express x16 slot. This will certainly bring back those pleasant memories from back in the days, when you had to do that all the time :)
Once the jumpers have been set to allow access to higher FSB frequencies, the BIOS Setup of AOpen i975Xa-YDG increases the supported frequency range from 200MHz to 320MHz.
So, we continued our overclocking experiments. With the Vcore set to 1.4V, our gradual overclocking stopped at 210MHz FSB frequency. Further frequency increase resulted into unstable system operation. However, we couldn’t possible be satisfied with this result, so we raised the processor core voltage by another bit – to 1.5V. However before we proceeded, we decided to replace the default cooler with a more solid-looking boxed cooler for the top Socket 478 Pentium 4 processors, which was definitely more efficient. Since AOpen i975Xa-YDG mainboard uses a standard Socket 478 cooler retention mechanism, the cooling system that we chose is “relatively” compatible with the board, as we have already mentioned above.
Once the cooler had been replaced, we managed to increase the FSB frequency to 231MHz. At this speed the CPU remained stable, however if the FSB frequency rose at least 1MHz higher, stability was gone. So, the maximum frequency we managed to get our Core Duo T2600 work at was 13x231MHz=3.0GHz.
I have to stress that this is a great result. With the top Core Duo processor model working at 2.16GHz clock speed we managed to achieve 40% frequency growth. No other processor families can boast overclocking potential like that of their top models. So, our suppositions cam absolutely true: the overclocking potential of contemporary mobile Core Duo processors installed in desktop systems was really impressive. It is important however that you know to take advantage of it and for that you definitely need an AOpen i975Xa-YDG mainboard with its great overclocking friendly functions.