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How to increase multiplier to normal for AMD Turion 64 X2 TL-50 in Win XP

Recently "downgraded" an Toshiba Siemens Amilo Xa2528 equiped with an AMD Turion 64 X2 TL-50 from Vista to XP.

Problem is - I've run out of ideas in how to increase the speed to its 1600mhz, instead of the 800 that I'm stuck on. FSB is correct at 200mhz but the multiplier stays at 4, instead of 8.

Other hardware is nVidia GeForce Go 6100, AMD Hammer.

Of course I've the first things you could think of. Removed the only thing in BIOS that had something to do with battery-saving. Used AMD's Power Mon to set to "maximum performance", checked for latest driver for the whole system. And so on... no success.

Im about to give up now and head back to the anoying vista... at least it shows 1600 mhz...

And yea.... the 800mhz IS accurate, since various benchmarks places the results among those for good old P3 cpus... :)

Any ideas?
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Do you have Cool'N'Quiet enabled in the BIOS?  Turn it off if it is.  When you run a cpu-intensive app like Prime95, does the clock remain at 800?

See http://forums.amd.com/forum/messageview.cfm?catid=16&threadid=108887
cosseAuthor Commented:
Since it's a notebook, very limited options are given in the BIOS. A specific CnQ is not one of them, The only option that comes close, is something liike "extended battery time" - wich in BIOS is explained as "if enabled - CPU works at lower speed". Of course that option is disabled.

Yep, no matter how much I stress the system, 100% CPU activity non-stop for 5minutes and every single CPU-utility (cpu-id, powermeter etc) never went above 801 Mhz.

Benchmarks in VISTA returns at least twice as much as in XP.

Also searched the net for several hours before I went here... found nothing. You guys are my last hope..  :)

Let me know if you have any other ideas Callador....
If it's OS-specific, try installing AMD's patch for the X2 processors: http://www.overclock3d.net/articles.php?type=3&id=49&page=1&desc=how_to_install_the_amd_x2_hotfix_patch
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