In fact, nothing outstanding. That is why for more exciting overclocking experience we would recommend to leave the AI Overclock Tuner at Manual, so that you could access all necessary parameters. Among them are:

• Bus frequency adjustment. Formally, the available frequency range is from 100MHz to 400MHz. However, this extremely high maximum is none other but a marketing trick. None of the CPUs available in the today’s market is capable of working at such a crazy FSB frequency.
• Adjustable memory frequency. The options here depend on the selected FSB frequency and can be described with the following table:

  FSB	Memory bus (BIOS setting)	FSB : MEM dividers
  100-132MHz	266MHz	3:4
  133-199MHz	266MHz 333MHz	1:1 4:5
  200-400MHz	266MHz 333MHz 400MHz	3:2 5:4 1:1

  In other words, unlike other mainboard makers, ASUS didn’t unlock the multipliers for the FSB frequency over 200MHz. Anyway, this is not much of a deal, because the today’s DDR memory can’t work at some 500MHz frequencies. Also note that even though BIOS Setup sets exact frequencies for DDR266, DDR333 and DDR400, the actual memory frequency for non-standard FSB rates will be determined according to the selected divider and will not correspond to what BIOS Setup indicates.

• Adjustable AGP/PCI bus frequency. This frequency can be set to: Auto, 66.66/33.33MHz, 72.73/36.36MHz or 80.00/40.00MHz. This way, you do not need to care about the PCI and AGP frequencies when you overclock FSB: they can be set as constants.
• Manually adjustable processor Vcore. The acceptable range starts at the nominal value and goes up to 1.95V with 0.025V increment. So, you have very broad opportunities to adjust CPU Vcore.
• Adjustable Vmem. The available options include the following values: Auto, 2.55V, 2.65V, 2.75V и 2.85V.
• Adjustable Vagp. You can adjust this parameter between 1.5V and 1.8V with 0.1V increment.

Besides, there is Performance Mode option on the same page, which we will discuss a little later.

We wouldn’t call the list of overclocking friendly options available in ASUS P4P800 the best one today.  We have come across some mainboards, which could boast bigger voltage ranges and higher FSB frequencies. However, the options offered by ASUS should be quite enough for practical overclocking of any today’s CPU. So, the final verdict to the overclocking friendly features of ASUS P4P800 will be highly positive.

For overclockers’ convenience, ASUS introduced CPU Parameter Recall function, which will automatically return all the settings to default ones, if the system fails to boot. But to our great disappointment, CPU Parameter Recall function doesn’t work in the existing BIOS versions. That is why, if you screwed some settings in the BIOS, press and hold INS key on boot-up and you will access the Setup to correct your mistakes.

To test the overclocking opportunities of ASUS P4P800 in practice, we tried overclocking Intel Pentium 4 2.4C with 800MHz system bus. The CPU featured 1.525V Vcore and reached 3.3GHz maximum frequency when overclocked on other i875P and i865PE based mainboards. The FSB frequency was set to 275MHz. ASUS P4P800 also didn’t disappoint us: we managed to achieve the same results with it. Unfortunately, the CPU wouldn’t let us go any further than that.

As for the memory timings configuration, they are all listed on a separate page in the BIOS Setup of ASUS P4P800:

Here we see DRAM CAS Latency settings (2, 2.5, 3); DRAM Precharge Delay (5, 6, 7 or 8), DRAM RAS# to CAS# Delay and DRAM RAS# Precharge, (2, 3 or 4). A pretty standard set, we should say. Also there is a Memory Acceleration Mode option, which allows enabling PAT, as ASUS claims. We are going to dwell on this feature later in the article, so keep reading :)

Hardware Monitor section of ASUS P4P800 contains quite a lot of useful info about the working system. For example, you can track the CPU and overall system temperatures, processor and other fans rotation speeds, processor Vcore and PSU voltage along all lines. Besides, here you can also enable ASUS’ brand Q-Fan technology. It allows slowing down the processor fan, so that it could produce less noise. This is a pretty useful feature, especially since the new coolers for high-end Pentium 4 processors are very noisy. At the same time, if all airflows inside the case are smartly organized, the CPU cooler shouldn’t rotate that fast.