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Locked Pentium multipliers

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DOOM   01-06-2003 at 08:53:42 AM

If Pentium multipliers are locked, how can they cope with different FSB speeds? For example, if a 1.5 GHz processor is running on a 400MHz FSB (3.75x), what happens if you run it on a 533MHz FSB? Will it adjust its multiplier, or will it attempt to run at 2.0?


-DOOM<P ID="edit"><FONT SIZE=-1><EM>Edited by doom on 01/06/03 03:06 AM.</EM></FONT></P>

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Spitfire_x86   01-06-2003 at 09:11:55 AM
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In this case, the P4 will run at 2 GHz

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Stiffler   01-06-2003 at 01:44:51 PM
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yeah thats why they call it "locked..."

Tim

<font color=blue>Its winter now... So how come my CPU temp is still </font color=blue><b><font color=red>55C</font color=red></b>

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Col_Kiwi   01-06-2003 at 10:32:21 PM
- 0 +

The previous replies covered your question, but there's something you should note.

Your 1.5Ghz isn't generated by 400MHz * 3.75. It's actually 100MHz * 15. 400MHz is the "effective" FSB clock, as the QDR technology of the P4 bus allows it to transmit data four times per clock. Hence, a normal bus would have to run at 400mhz to transfer data at the same (3.2GB/s) rate. Rather then explain all this, they just call it a 400mhz "effective" FSB.



-Col.Kiwi

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DOOM   01-06-2003 at 10:33:44 PM
- 0 +

Thank you. Your response was very informative!



-DOOM

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