Intel-Core-i7-7700K

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dominic
Posts: 312
Joined: Thu Jun 14, 2012 7:19 am

Intel-Core-i7-7700K

Post by dominic » Fri Jan 20, 2017 11:09 am

Hello, what do you think of this processor? 4.2 GHz with WRF they would have good performance?

http://ark.intel.com/it/products/97129/ ... o-4_50-GHz

meteoadriatic
Posts: 1510
Joined: Wed Aug 19, 2009 10:05 am

Re: Intel-Core-i7-7700K

Post by meteoadriatic » Fri Jan 20, 2017 2:06 pm

Hi, 5-10 percent faster than 6700k....

surgeon
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Re: Intel-Core-i7-7700K

Post by surgeon » Fri Jan 20, 2017 3:28 pm

What about 6800K with 4 channel RAM? ;)

dominic
Posts: 312
Joined: Thu Jun 14, 2012 7:19 am

Re: Intel-Core-i7-7700K

Post by dominic » Fri Jan 20, 2017 3:40 pm

Hello Guys, I was considering to replace my old i5 3750k CPU with a new, seventh-generation quad core. I would like to focus on the solution to 6 cores but the cost of the mother board + ram + cpu becomes challenging and frankly I do not know what it's worth to buy a cpu to 6 hearts compared to a 4 hearts.

at that point I should focus on haswell processor. I wonder if it's worth it or better to buy a nice i7 of the seventh-generation type 7700

dominic
Posts: 312
Joined: Thu Jun 14, 2012 7:19 am

Re: Intel-Core-i7-7700K

Post by dominic » Fri Jan 20, 2017 3:51 pm

surgeon wrote:
Fri Jan 20, 2017 3:28 pm
What about 6800K with 4 channel RAM? ;)
Great, but the motherboard would cost so much, and I also see a few around on ebay and amazon. Cost around 300 Euros ...

There is a significant difference with 7700k?

6 cores vs. 4 cores?

Then one thing, I with UEMS on 4 hearts do work in run only 3 core, UEMS goes faster with 3 cores with 4 cores. Having available a 6-core at this point 5 core would work together?

The benefits must justify the expense, I think the difference is several hundred Euros compared to 7700 LGA 1151

meteoadriatic
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Joined: Wed Aug 19, 2009 10:05 am

Re: Intel-Core-i7-7700K

Post by meteoadriatic » Fri Jan 20, 2017 4:00 pm

surgeon wrote:
Fri Jan 20, 2017 3:28 pm
What about 6800K with 4 channel RAM? ;)
Like another ~10% faster than 7700K and ~20% faster than 6700K.

meteoadriatic
Posts: 1510
Joined: Wed Aug 19, 2009 10:05 am

Re: Intel-Core-i7-7700K

Post by meteoadriatic » Fri Jan 20, 2017 4:02 pm

dominic wrote:
Fri Jan 20, 2017 3:51 pm
Then one thing, I with UEMS on 4 hearts do work in run only 3 core, UEMS goes faster with 3 cores with 4 cores. Having available a 6-core at this point 5 core would work together?
This is absurd and I think it happens only on PGI compiled binaries like UEMS use. I never NEVER experienced anything similar on my Intel builds.

dominic
Posts: 312
Joined: Thu Jun 14, 2012 7:19 am

Re: Intel-Core-i7-7700K

Post by dominic » Fri Jan 20, 2017 4:13 pm

meteoadriatic wrote:
Fri Jan 20, 2017 4:02 pm
dominic wrote:
Fri Jan 20, 2017 3:51 pm
Then one thing, I with UEMS on 4 hearts do work in run only 3 core, UEMS goes faster with 3 cores with 4 cores. Having available a 6-core at this point 5 core would work together?
This is absurd and I think it happens only on PGI compiled binaries like UEMS use. I never NEVER experienced anything similar on my Intel builds.
You do not believe it but if the cpu configuration (in the domain) I put 4 cores 4 tile the run is slower than with 3 core and 3 tile

meteoadriatic
Posts: 1510
Joined: Wed Aug 19, 2009 10:05 am

Re: Intel-Core-i7-7700K

Post by meteoadriatic » Fri Jan 20, 2017 4:35 pm

I didn't said that I don't believe but that it is absurd :mrgreen: I saw that when I used EMS binaries, too. Not with Intel. I think this is some flaw in PGI... not sure but this does not have any sense to me. When I load for example 7 threads at 8 core CPU I clear have load around 7.00 and if I actually use 8th core for something else, my WRF does not slow down at all and load goes to around 8.00. Very expected.. and if I assign 8th core for WRF it gets faster. In all imaginable configurations I set. Nesting, no nesting, big, small... why the hell it should slow down with all cores? I never saw good explanation for that.

dominic
Posts: 312
Joined: Thu Jun 14, 2012 7:19 am

Re: Intel-Core-i7-7700K

Post by dominic » Fri Jan 20, 2017 4:38 pm

I'm glad this thing because maybe it could help solve my problem. If you use 4 cores on 4 UEMS crashes

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