Asus P4T533 and P4 2.4c

[gtsmith32909]

Im sure I've screwed up, but will a P4 2.4c work on a Asus P4T533 motherboard? I thought the only P4 with Hyperthreading was the 2.4c. My Asus supports it, but the CPU Frequency Multiplier is set at 12 and will not change. I have updated the BIOS from 1003, 1005, and 1006 to no avail. I know my motherboard says 533/400 mhz FSB, but I thought the processor would still be backwards compatible. Finally, why does this Asus board support hyperthreading if their are no processors that run at 533/400mhz FSB with hyperthreading? Thank you for any support!!!

[kevrob1]

The "c" versions of the P4 run on an 800MHz frontside bus. All P4's that I'm aware of are clock locked so all you have to work with is the fsb frequency. I don't belive the P4c processors are backwards compatible. Mobo's do come with 400/533/800Mhz frontside busses to accomadate the various versions of the P4. I belive you have a motherboard issue not a bios issue.:t

[causticVapor]

The 2.4C, 2.6C, 2.8C, 3.0C, and 3.2C processors run on an 800MHz bus, and they all support hyperthreading. The P4T533 is based on the intel 850E chipset, which only supports a 533MHz bus.

The only 533MHz FSB P4 that supports Hyperthreading is the 3.06GHz model.

You have two options, either get a new motherboard (based on the 865 or 875 series chipsets) or simply return the CPU and buy a 3.06. The 2.4C is definitely a good overclocker, though, so you might want to get a new board and some quality Corsair TwinX DDR500 instead of having to live with cantankerous, unoverclockable RDRAM and a very close-to-the-limit C1 stepping 3.06.

[kevrob1]

Actually you have a third option, you could run the P4c @ 533Mhz fsb but then your speed would be much slower defeating the purpose of having the chip in the first place.:(

[causticVapor]

I know some higher bus speed p4 chips have a problem posting in lower-bus mobos. For what reason, I don't know.

That's why I didn't mention that.

[kevrob1]

Yeah, a friend of mine had a similar situation and he ran the proc at half the bus speed for 1.2GHz and then stepped it up to about 2.0GHz but that was all he could get stable.:t