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Does it mean, with limited budget, i7 128 ssd is a better deal than i5 256ssd if using tb3 external ssd?
Yes. Assuming you either don't need more than 128GB total, or plan to have most/all you files in an external (or network storage), then the i7/128GB option is great value.
 
Yes. Assuming you either don't need more than 128GB total, or plan to have most/all you files in an external (or network storage), then the i7/128GB option is great value.

I think i7 is only 10% more performance than i5, I could be wrong though.
 
I am using a Samsung EVO 970 2TB NVME in a Sonnet Echo Express Thunderbolt 3 PCIe Enclosure. Using APFS with encryption I am getting the following speeds with my MacBook Pro 2016 NTB i5:
speed.png

I recommend ordering the 128 GB Mac Mini and investing in this external do it yourself solution. You can compare this speed to my other SSD and hard disk connected to the same computer:

benchmark.png
 
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I think i7 is only 10% more performance than i5, I could be wrong though.
Depends on workflow. Turbo speed are only 10% higher but it does have hyperthreading which can make a big difference depending on workload.

In any case! It isn't possible to order the i5 with 128GB SSD.
Options are i3/128, i5/256, or i7/128 (BTO from the i3 page).
This last option is arguably the best value option so long as you are happy with 128Gb internal.
 
Depends on workflow. Turbo speed are only 10% higher but it does have hyperthreading which can make a big difference depending on workload.

In any case! It isn't possible to order the i5 with 128GB SSD.
Options are i3/128, i5/256, or i7/128 (BTO from the i3 page).
This last option is arguably the best value option so long as you are happy with 128Gb internal.

Yes, you may be right but when I see the figure of 10% increase the performance that's something isn't worth to pay more $200, on top of that I also heard there is a security risk when using a hyperthreading (I could be wrong once again).

There is no option for i7/127GB but only start with i5/256GB or i7/256GB.

My wild guess that i5/256/8gb or 16-32GB is the sweet spot.
 
There is an i7 128GB option like described in this thread: Choose the base model and then you can BTO it to an i7 but not an i5.
 
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Barefeats has posted a test of the mac mini i5 and finds substandard write speed for the flash storage as a result of thermal throttling.

http://barefeats.com/mac-mini-2018-versus-other-macs.html

Read the article carefully. "What first appear the result of thermal throttling..."

Apart from that, I'd really love an explanation how thermal throttling would affect the write speed of an SSD drive. I think "thermal throttling" has just come into MacRumors fashion and any real or imagined faults are attributed to it.
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Yes, you may be right but when I see the figure of 10% increase the performance that's something isn't worth to pay more $200, on top of that I also heard there is a security risk when using a hyperthreading (I could be wrong once again).
Not on a MacMini. Or on any computer with a single user. With hyper threading, it is possible that malware on your computer affects users other than the one who installed the malware. So if you have a server with 5 users, and one user installs malware, then it could affect the other four. The MacMini is _your_ computer with a single user. If you install malware, you're out of luck (and hyper threading is no additional risk at all). If you keep malware away from your MacMini, you're fine.
 
Not on a MacMini. Or on any computer with a single user. With hyper threading, it is possible that malware on your computer affects users other than the one who installed the malware. So if you have a server with 5 users, and one user installs malware, then it could affect the other four. The MacMini is _your_ computer with a single user. If you install malware, you're out of luck (and hyper threading is no additional risk at all). If you keep malware away from your MacMini, you're fine.

The Spectre and Meltdown problems have absolutely nothing to do with multiuser accounts. It is about applications getting access to parts of the memory they should have no access into.
 
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