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i485GE & Prescott?

Last response: in CPUs
March 12, 2004 7:57:34 AM

Will any 478-pin CPU work fine with any Socket 478 mobo? If yes, then the rest of the question is probably superfluous.

A friend has an i845GE based mobo(400/533 System Bus) and wants to insert a PIV 2.8G (Prescott, 800FSB, 1MB cache, HT). The BIG QUESTION: Will it boot?

Is it going to be crippled by the mobo's system bus? I heard mention of a BIOS upgrade being needed, any truth to this? Is the 1MB cache going to be fully utilised by the board? Intel mentions that the chipset supports HT, but nothing is mentioned on the motherboard page itself... Any other advice at all?

Upgrading the mobo is a no go for quite a while. The old CPU was also a PIV (either Northwood or Nothwood A, but a pin snapped off, so we're junking it).



P4 data

I've put together four computers over the years (never a Pentium), which means I've got just enough knowledge to get myself in trouble.

Thanks for any and all help,

More about : i485ge prescott

March 12, 2004 8:07:30 AM

The Prescott probably wont run due to power requirements. However if it did, it would be at 2/3rds it's rated speed. The board will no doubt support the P4b @ 3.06. This is an HT chip, and would perform as well as a P4e 2.8 would on an 875/865 board.
March 12, 2004 10:11:39 AM

Not a good idea; as endyen pointed out its quite possible it won't boot at all if it can't meat prescotts power requirements. Even if the MB supports FMB 1.5 and VRM10, you'd need a 533 FSB chip anyway, not a 800 MHz FSB model.

Regardless, it is useless. Prescott is slower than northwood at speeds below ~3.2 GHz, and its far hotter. Either get a Northwood, or upgrade the motherboard. No use in buying prescott at all for now, and especially not a low frequency, bandwith starved model.

= The views stated herein are my personal views, and not necessarily the views of my wife. =
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March 12, 2004 11:04:44 AM

Thanks to you and P4Man for your help. It's much appreciated and already averted a costly mistake (my scalp, for starters).

Looks like I'll be recommending a switch down to a P4 2.8B (3.06 is a lot more expensive comparitively in local market), 533FSB, 512K Cache, Northwood. No HT, I assume.

How do I identify between the Northwood and Coppermine? They seem to have identical specs, and are both Socket 478. Or are these different names for the same chip? Any significant difference this and Northwood?

Sorry for being a pain. Hopefully this is the last question, and we'll be able to purchase with confidence.

Thanks again to all who reply,
March 12, 2004 11:37:09 PM

Intel released a 533FSB 2.4e and it should be like $150

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March 13, 2004 5:28:36 AM

If this is a gaming rig, the HT is more of a hinderence than a help anyhow.
You want the P4b chip, ie with 133/533 fsb(quad pumped).It is a Northwood B chip. Good luck.
March 13, 2004 7:11:35 AM

"the HT is more of a hinderence than a help anyhow." - crack smoker passing out advice?

HT rocks, how did you come up to that conclusion???

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March 13, 2004 7:18:54 AM

For gaming mr ocer, for gaming. While gaming HT can allow background progs to take a higher level of cpu usage.
March 13, 2004 7:20:25 AM



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March 13, 2004 7:30:02 AM

You're going to want to use a Northwood. The only HT supporting processor that will work properly in your board is the 3.06, for the price difference you might as well find yourself a 2.53B-2.8B.

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