I've had issues with both the HP dv6t and Alienware m15x.

Here are some logs with TurboBoost enabled and disabled.
http://www-personal.umich.edu/~mjbommar/m15x/ 

I've done some performance testing here:
http://global.phoronix-test-suite.com/index.php?k=profile&u=mjbommar-10157-25021-1778

You can see that Ubuntu virtualized under VirtualBox on Windows 7
outperforms Ubuntu 9.1 running natively by quite a bit.  This was the
case with the dv6t, though there were also thermal issues with that
machine (buggy BIOS).

I also compiled 2.6.32-rc8 without ACPI, SMP, or SMT.   The scimark2
scores were around 530 again, indicating that there was no performance
gain even when the OS was only accessing one core.

I'd say this is a pretty big issue.  Under native Ubuntu, an M4400 with
DDR2 and an C2D X9100 currently beats the m15x with DDR3 and an i7 820.

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core i7 i5 (Lynnfield) turbo boost not working
https://bugs.launchpad.net/bugs/429036
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