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Changing Sandy Bridge to Ivy Bridge
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Blind_Sniper
Tux's lil' helper
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Joined: 20 Apr 2018
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PostPosted: Sat Dec 08, 2018 5:37 pm    Post subject: Changing Sandy Bridge to Ivy Bridge Reply with quote

Hi!
Today I've got a box with gentoo installed.
It has a Sandy Bridge Pentium G850 on board. I have a more powerful cpu: Ivy Bridge i3-3225, and I want to replace pentium with it.

The question is: have I to rebuild entire the system from scratch or is it enough to rebuild packages as they will be updated in portage tree?
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bunder
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Joined: 10 Apr 2004
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PostPosted: Sat Dec 08, 2018 8:28 pm    Post subject: Reply with quote

if the chip is compatible in your motherboard it should boot... as for making the change in gentoo, if you don't want to recompile everything now, i would at least do gcc, then @system.
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saboya
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Joined: 28 Nov 2006
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PostPosted: Sat Dec 08, 2018 11:03 pm    Post subject: Reply with quote

Everything will keep working just fine. Might want to compile AVX-compatible software since Ivy Bridge supports that and Sandy doesn't.
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mike155
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Joined: 17 Sep 2010
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PostPosted: Sat Dec 08, 2018 11:34 pm    Post subject: Reply with quote

Don't forget to adjust CFLAGS, CXXFLAGS and CPU_FLAGS_X86 in /etc/portage/make.conf.
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toralf
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Joined: 01 Feb 2004
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PostPosted: Sun Dec 09, 2018 9:53 am    Post subject: Reply with quote

Do this:
Code:
echo "*/* $(cpuid2cpuflags)" > /etc/portage/package.use/00cpuflags
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Blind_Sniper
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Joined: 20 Apr 2018
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PostPosted: Sun Dec 09, 2018 12:08 pm    Post subject: Reply with quote

Thanks for replies, guys.
Seems mobo has an old BIOS which lacks of IvyBridge support, just refuses to start.
Will try to rewrite BIOS and try to boot again.
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est921
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Joined: 20 Dec 2015
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PostPosted: Sun Dec 09, 2018 1:00 pm    Post subject: Reply with quote

saboya wrote:
Everything will keep working just fine. Might want to compile AVX-compatible software since Ivy Bridge supports that and Sandy doesn't.
Sandybrigde does support avx. I think ivybridge is mostly a die shrink, not many new instructions or changes so rebuilding everything might not even make a noticable difference. Anyway, upgrading to a newer cpu from the same manufacturer should not result in any problems. I went from a 2600 to a 6800k without problems
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