On Tuesday 22 January 2013 05:16:23 PM IST, Nilesh Govindrajan wrote: > On Tuesday 22 January 2013 05:13:21 PM IST, Nikos Chantziaras wrote: >> On 22/01/13 13:14, Nilesh Govindrajan wrote: >>> On Tuesday 22 January 2013 03:13:01 PM IST, Nikos Chantziaras wrote: >>>> On 22/01/13 09:41, Nilesh Govindrajan wrote: >>>>> So I have this old E2180 processor and no money as of now to buy a new >>>>> rig :P >>>>> I'm trying to overclock my CPU using BIOS host clock control and >>>>> everything is fine at 2.6 Ghz up to bootloader. >>>>> >>>>> Kernel segfaults. Any idea why? I'm running pf-kernel 3.7.2 and it >>>>> doesn't work with vanilla kernel either. >>>>> >>>>> Intel MCE is disabled in kernel configuration. >>>> >>>> When you raise the "host clock", which is the FSB, you are also >>>> raising the frequency of your RAM. So make sure you select a lower >>>> FSB:DRAM ratio in your BIOS. To begin with, set it to 1:1. >>>> >>>> Also, if you only have the stock CPU cooler that came with it, you >>>> won't be able to actually get a stable overclock. Your CPU's stock >>>> frequency is 2GHz. Without a better cooler, you might get it to 2.2 >>>> or 2.3 maybe. But 2.6? That's pretty optimistic. I don't think >>>> it'll work in the long run, unless you happen to have picked a good >>>> chip that can be overclocked without raising the VCore. >>>> >>>> But first, solve the RAM problem by lowering the FSB:DRAM ratio. >>>> >>>> >>> >>> I don't get even 2.1 with the stock cooler. Temperature easily goes >>> above 75-80 (spec say high temp is 86) on the prime95 test. Quite easy >>> to cook it considering that I'm a Gentoo user :D >>> Not really worth that. Thanks for replies. >> >> It really worth trying *lowering* VCore instead of raising it. If your >> chip happens to be very good and deal with this without causing >> instabilities, this will result in a big drop of temperatures. I did >> this on a C2D CPU in the past. I lowered VCore and raised FSB. I >> ended up with a good performance boost *and* lower temperatures. >> Unfortunately, not all chips behave the same. It's hit and miss. >> >> >> > > Now that sounds like a deal. The normal VCore for my CPU is 1.325V.. > > -- > Nilesh Govindarajan > http://nileshgr.com
Wasn't able to get much far with undervolting, it works at 1.3125V @ 2.40 Ghz. Temperature doesn't cross 75C. Thanks a lot man! :-) -- Nilesh Govindarajan http://nileshgr.com
