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SL6S5 versus SL726 Pentium 4 3.06 GHz?

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First post, by VanillaFairy

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I've been continuing to look on eBay to see if any cheaper 3.06GHz 533 P4s appear on eBay, and recently I just saw a Pentium 4 Mobile HT at 3.06 GHz appear...
What would be the downside of using this over a proper desktop 3.06GHz P4? The cache size seems to be the same, and it's for the same FSB speed, and it's also around £60 cheaper (around £20 and not £80)...

and, if it is worse than the desktop version, how would it compare to just a 2.8 GHz P4 with the same FSB speed?
Also, would it even be compatible with non-mobile motherboards?
(for reference, the only motherboard I have right now that either would go in is the ASUS P4S533-VX, a Northwood/Willamette-only board from an old Sony computer my family had, with a 533MHz FSB speed. Techpowerup states that SL726 is Northwood, so I do wonder if it'd work...)

I want to see just how far I can push my motherboard, but I'm not sure if I'm ready to drop £80 on a Pentium 4 just yet, so if that mobile CPU works and with similar performance I think it'd be an easy choice.

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Reply 1 of 6, by sfryers

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If I remember correctly, the only notable difference between the two is that the mobile variant includes Intel SpeedStep, allowing the CPU frequency to be switched between a low-power 1.6GHz state and its full rated speed. The mobile CPU should boot on a desktop board, but without SpeedStep support in the BIOS, you're likely to be stuck at 1.6GHz all the time.

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Reply 2 of 6, by st31276a

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Either that or flat out.

My initial guess would be full speed.

Reply 3 of 6, by havli

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I think these mobile P4 run at minimum multiplier in desktop board.... so pretty much useless. Which is the reason for lower price.

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Reply 4 of 6, by Shponglefan

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I recently looked into mobile Pentium 4 setups. I came to the conclusion it's not worth it in part trying to get a compatible motherboard and/or adapter, and the issue of potentially running at the lower clocked multiplier.

In the latter scenario it would make more sense to get a lower speed desktop P4.

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Reply 5 of 6, by VanillaFairy

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I think I'll go for either a 2.8GHz or bite the expensive bullet for the 3.06 GHz desktop one, then. Thanks.

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Reply 6 of 6, by st31276a

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The difference between a 2.8 and a 3.06 is not life changing.

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