Alessandro Brezzi wrote: >> So I'll ask again if anyone is happily running the x86_64 version of FC-6 >> on an Athlon 64 machine? > > Yes, I'm happily running FC6 x86_64 on my box Athlon 64 3200+. > No problems with the installer (GUI). I've done a fresh install (my > preferred method for upgrading). The MoBo is an ASUS, graphic card ATI > Radeon, 2GB of DDR. Both NIC, the GigaBit integrated and a RealTek > 10/100 are working. OK, thanks for the responses. Evidently the x86_64 version of FC-6 works fine, in principle. I also have an Asus motherboard and ATI Radeon 9600 video card, though I only have 512MB RAM. What I find puzzling is that my machine works perfectly under the i386 version of FC-6 and under Windows XP. Under the x86_64 version it can be guaranteed to crash within 1 hour (usually within 1 minute), even if run in text mode, and even with a compiled vanilla kernel. Also, after the crash it is not sufficient to re-boot by pressing the power switch for 10 seconds - one has to switch the machine off and on at the back. I take it this shows some kind of memory corruption. It's a Targa machine, and I looked at the www.targa.com to see if they had upgraded the CPU or BIOS, but they are still shipping the same versions, so I assume there has been no general failure. Could it be heat? It seems improbable to me that one OS can create much more heat than another. So I am genuinely baffled, and would like to hear of any theory on this. At the same time, this has really become a theoretical question, as I am perfectly happy to run the i386 version, which seems to me to run at least as fast as the x86_64 version ever did. -- Timothy Murphy e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland