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20th August 2004 00:11 #1Registered User
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20th August 2004 00:14 #2
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20th August 2004 00:18 #3Registered User
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20th August 2004 00:21 #4
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20th August 2004 02:13 #5
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http://comexgroup.com/technologies/overclocking.htm
, ...Last edited by Stefo; 20th August 2004 at 02:19.
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20th August 2004 03:39 #6Registered User
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20th August 2004 09:54 #7...
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20th August 2004 23:07 #8...Originally posted by achilles
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As you can see, there are no external differences - the die is the same size on both CPUs and the layout is exactly the same. The differences between these two processors are all on the inside.
The first difference between the two chips is the multiplier. All current desktop Bartons have a locked multiplier, while all mobile Bartons have an unlocked multiplier. A fully unlocked multiplier is a great addition to have when overclocking; you can quite often reach the limit of another part of your system before your processor tops out, or vice versa, during your quest to reach your best "system" overclock. I refer to it as a system overclock, because raw CPU speed is not necessarily everything. It is important to strike a compromise between high front side bus (while remaining in sync with your memory bus to give good system bandwidth) and raw CPU speed to gain the maximum performance from the system as a whole. Athlon XPs on the whole are lacking in bandwidth due to their architecture, so any extra bandwidth you can give to your system will pay dividends when it comes to gaming and number crunching tasks.
Secondly we have a difference in the default system clock. The desktop Barton core runs at 166MHz FSB, where the mobile Barton runs at 133MHz FSB. The reasoning behind this is the fact that all Athlon-based laptop motherboards run at 133MHz FSB, and it would not make sense to release a 166MHz FSB mobile part for an architecture that is being phased out in favour of the K8 architecture.
Since the mobile Barton runs at a lower front side bus, it requires a boost in speed to give approximately the same performance as its desktop counterpart. The desktop Barton 2500+ runs at 1833MHz (11.0x166) while its mobile sibling runs at 1866MHz (14.0x133).
Finally, there is a difference in default core voltages. The desktop Barton runs at 1.65v, while the mobile Barton is rated to run at 1.45v. This can make quite a difference when it comes to overclocking as the mobile Barton is running at a higher external core clock, with lower voltage requirements. The silicon used in mobile Bartons is taken from the centre of the wafer, so they're made from better silicon, which should clock higher at the same core voltage.Last edited by Stefo; 20th August 2004 at 23:21.




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