[ferroburak]

Hi,
Has anyone had the chance to compare the two, Intel I7 4930k vs. Amd Opteron 6344 in terms of Fluent performance?

Thanks.

[HyperNova]

hi Ferroburak
based on my experience intel cpus is better for CFD ( i work with Fluent ) , i have 2 systems
First, AMD FX 8350 , ASUS M5A 99FX Pro R2.0 , 3*4 gig Ram 1866
2nd, intel i7 4770 , ASUS Z87K , 2*8 gig Ram 1600
i say intel is better and faster , and at highest pressure (using 8 cores) intel has very much lower temperature , for AMD temperature will go more than 70C but for intel it stays belower than 55C , So i had to buy a cpu cooler for my AMD cpu because the fan in box was not enough! i bought ThermalRight AXP-100 for AMD

[evcelica]

Both the i7-4930K and AMD-6344 have quad channel memory, so they should both do very well for CFD, but I would guess the i7-4930K would be slightly better.

HyperNova, You are running your AMD in an unbalanced Memory configuration.
You should have each of the two memory channels populated evenly, which means using either two or four DIMMs, not three. Remove one so that you have bank 1 of channels 1 and 2 populated, and you should see performance increase. Let me know how much if you make this change.

[HyperNova]

hi evcelica,
about the unbalance you were right , today i bought another module and now i have 4*4gig 1866 ,i did not compare but i feel the performance increased just not because of increasing the amount of memory but for the configuration (my mesh size is 600000cells) , and i think 4*4 is better than 2*8 (with the same mesh size even! because i feel cpu have more ways to save data), what is your opinion ? thanks

[evcelica]

Agreed, I have seen better performance with 2 DIMMs per channel than with just 1. I've also read it is faster, but only slightly. Either way is much better than an unbalanced configuration of one channel with 2 DIMMs and the other with only 1 DIMM. This unbalanced memory population causes a HUGE performance loss.