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Re: Processor upgrade

 
 
Wolfgang Weisselberg
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      05-15-2013
Alfred Molon <(E-Mail Removed)> wrote:

> Anyway, how much faster would an i7 compared to the Core 2 Duo P8600 be?


That depends on the program and data used, as the CPUs don't
simply increase the speed (more MHz, blanket speed increase),
but also efficiency: less cycles needed for a given operation
--- this varies a lot by the operation looked at, the quality
of the branch predictor, and thus by the program and data used
to compare. (This can be even more complicated if you compare
Intel and AMD: in some disciplines one is quite faster, in
others the other one is. Here are some various benchmarks
between AMD's octocore and some i5 and an i7:
http://www.phoronix.com/scan.php?pag...rabdver2&num=1
)

Oh, and there's compiling for the extra CPU capabilities
instead of using only basic instruction sets, in specific
circumstances that can give quite a speed boast --- but
unless you're compiling the stuff yourself you'll probably
won't get these optimisation. (And then there's how well
opimizing the compiler is for your specific CPU, now and in
future.)
See here for an example how 2 good compilers aren't equal:
http://www.phoronix.com/scan.php?pag...3_fx8350&num=1

Then there's the fact that your i7 won't be faster while you're
typing text into notepad (it's waiting for you all the time),
but may be vastly faster crunching numbers --- and the same i7
may be much slower on image manipulation than an identical i7
with a different graphics card (which the image manipulation
program uses to speed up some operations).


But if you want a single, unreliable number:
http://www.cpubenchmark.net/pt7_cpu_list.php
Intel Core2 Duo P8600 @ 2.40GHz 1633
Intel Core i7 620UM @ 1.07GHz 1577
[more i7's in raising performance] :
Intel Core i7-3970X @ 3.50GHz 12923

for what it's worth. Single CPU, multi-core, AIUI.

So an i7 dual core notebook (low power) CPU at 1 GHz may in
fact be a tad slower or a high end i7 may be almost 8 times
as fast --- for what it's worth.

Remember you'lll (probably, I'm not sure) need a new mainboard
(probably a different socket) and a cooler and you'll probably
like more RAM (not enough RAM costs lots of speed loss, what
is "enough" depends on what you do) and likely you'll want a
SSD (and you want more RAM for that to reduce writing there)
and you might need a new PSU ... so you could just as well
switch to AMD ---
http://www.cpubenchmark.net/cpu.php?...t-Core&id=1780
give way more bang for the buck than Intel: 50+ PassMarks/USD
--- the Intel Core i7-3970X @ 3.50GHz offers only 12.61 ---
but they'll be only 5,5 times at fast, and being an octacore
instead of a hexcore the individial core is only 1.4 times
faster than your P8600's core (with the i7-3970X each core is
2.6 times as fast).

And single-thread the i7-3970X delivers 2,047 PassMarks, the
AMD 1,522, and the P8600 936 (many CPUs can go into a boost
mode with a single thread: 2*936 > 1633): the i7 is 2,1 times as
fast, the AMD 1,6 times (I doubt these numbers, though, they
don't fit --- the AMD only has a tiny bit of single thread
boost!):

That means the AMD is quite a bit slower and vastly cheaper
than a top of the line i7; both will be a bit faster
with single core use, the i7 notably so, the AMD possibly
only noticeably. Both will leave the P8600 in the dust *if*
you can keep all cores working at the same time; again, the
i7-3970X will probably outperform the AMD by quite a margin.
The AMD is around USD 150, the i7-3970X around USD 1,000.

AfterShot Pro uses all cores, for the record.

Do note that there are a lot of i7's that are vastly cheaper
(and somewhat slower) than the i7-3970X ...

Does that answer your question?

-Wolfgang
 
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