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400MHZ mobo + 533MHZ P4..compatible?

Last response: in CPUs
May 30, 2002 8:35:01 PM

Is a motherboard with 400MHZ FSB compatible with a P4 2.5GHZ 533MHZ FSB? Is a P4 533MHZ backwards compatible, can it act as if it had only 400MHZ FSB?

I bought a motherboard about 4 months ago that is made to support 400MHZ FSB P4 processors. It's an ABIT BD7-RAID. I was about to buy P4 2.4 400MHZ FSB then came P4 2.5 but with 533MHZ FSB? so are they compatible?
May 30, 2002 9:19:05 PM

533 P4s will run at 400, at a lower clock speed. Some motherboards (like my TH7II) will go between 100 and 133, you should be able to "overclock" to 133.

<font color=blue>Hi mom!</font color=blue>
May 30, 2002 9:31:52 PM

without overclocking or any tweaking will a motherboard with 400MHZ cpu support can recognize a P4 with 533MHZ FSB, specifically the 2.5GHZ P4. If it can recognize it will the clock speed go lower?
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May 30, 2002 9:33:01 PM

You can run your BD7 at 133MHz (533MHz effective) or higher. Just make sure you get the latest BIOS.

:wink: <b><i>"A penny saved is a penny earned!"</i></b> :wink:
May 30, 2002 9:36:18 PM

so they are not directly compatible. need some tweaking eh?...well I'll just get a P4 2.4 with 400MHZ FSB. The PC ain't mine anyway...a friend of mine is having me built a 4000 dollar PC! hehe...

so this means the P4 2.5GHZ 533MHZ FSB won't run at all unless I run the mobo (BD7 400MHZ) in 133MHZ?
May 30, 2002 9:38:05 PM

hey AMD_Man, is it true that there are P4 2.5s with 400MHZ FSB out there...I saw a couple at less than 500 bucks, about 460
May 30, 2002 10:24:31 PM

If you do run it at 400MHz FSB the processor will operate at 1.9GHz... not what you paid for i'm sure! :wink:

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May 30, 2002 10:34:13 PM

Really??!!!!! that's crap! Intel better come up with 2.5MHZ and up in 400MHZ flavor! I need to understand more about these MHZ and how they go together, both in memory and cpu!
May 30, 2002 11:04:11 PM

Get him the P4 2.53GHz (533MHz FSB), but just flash the latest BIOS from ABit that fixes a cold boot issue at higher clock speeds on the BD7. Yes, I do believe a 2.5GHz Northwood A is coming.

:wink: <b><i>"A penny saved is a penny earned!"</i></b> :wink:
May 30, 2002 11:19:45 PM

well I've seen a couple of 400MHZ P4 2.5s in price comparison websites but I don't know if they're true. They cost around 460-500 too...P4 2.5s 533MHZs are still around 600 right? Well I'll just get my friend the 2.4 400MHZ coz we've been waiting to build the PC for 4+ months now! If he has money for a 4000 PC then he'd have enough for an upgrade when newer technologies come...thanks guys!
May 31, 2002 6:59:26 AM

They will work together, but the motherboard will make a veiled comment about the cpus mother to which the p4 will tell the motherboard how well its wife sucks cock. Then all hell will break loose.

:wink: The Cash Left In My Pocket,The BEST Benchmark :wink: