4GB RAM slows down ubuntu

[Mohamad Faizul]

femi71 at web.de wrote:
> Hi,
>
> yesterday i installed kubuntu in order to get rid of a silly problem: When i add 1GB RAM (3x 1GB are already inserted), Suse 10.1 got very very slow. Booting Windows or Knoppix makes no problem with 4GB. Now after installing kubuntu with kernel 2.6.24-24-generic the problem is the same: 3GB are ok, 4GB slow down the system dramatically (2, 3 times slower). At a certain point during booting, the moving bar stucks. Where can i search for the problem?
>
> It is a ASUS P4P800 SE Mainboard.
> RAM is said to be supported,
> the BIOS recognises it (it says 3,7GB but this is documented in the manual), even in dual channel mode.
> RAM is ok and all 1GB bar fit together. (memtest gives no errors.)
> again; Windows XP (and Knoppix) has no problems, (Knoppix is a bit slow as it is running from CD, therefore i wouldn't  swear that it is not slower.)
>
> Is this a known bug or has someone an idea for a solution?
>
> Thanks,
>
> Günther
>
>
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have you tried ubuntu x84_64 ?