Dual Core Or Dual CPU - What's the real difference
youshi10 at u.washington.edu
Thu Feb 8 03:22:33 UTC 2007
Andrew Hammond wrote:
> On 2/7/07, Nicole Harrington <drumslayer2 at yahoo.com> wrote:
>> Hello all,
>> I have been building/using servers that were dual CPU
>> AMD Opteron systems for some time. (usually 246
>> Opteron cpu's)
>> Now of course the world is shifting to Dual Core.
>> Using FreeBSD, what is really the difference, besides
>> power and ability to shove in more memory, between
>> having the two seperate CPUS's?
> Well, you also have two additional HT buses for memory access. And one
> additional HT bus for peripheral access although most motherboard
> manufacturers don't actually do anything with it.
>> What if I did 2, Dual Core cpu's? Would the SMP
>> overhead and sharing to a [Giant Locked] disk and or
>> network erase any benefits?
> Benefits to what? Your computer can idle quite effectively with a 386
> processor while consuming less power, producing less heat and
> requiring much less capital outlay than any Opteron box.
I'm not sure where you got that info, but for the Pentium processor line
at least, you're MUCH better off getting a Core Duo compared to the
Pentium 4 HT enabled equivalent.
Intel's power system (at least at the hardware level) is pretty good
about shutting down cores when not in use, and actually it's better
power wise to get a dual core processor compared to a dual processor
machine, since on a dual processor machine both processors are fired up
at the same time.
Besides, with dual cores it's a shorter path electrically core to core,
compared to a processor. The only OS that actually performs better with
a dual single core processor setup compared to a single dual core
processor would be Mac OSX (believe it or not). But that's because they
use a mach kernel instead of a monolithic kernel like FreeBSD, Linux,
Look up previous discussions on this list for the mach kernel and OSX if
you're curious, or just look up the article on wikipedia.
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