Oh, yes i had been very afortunated i could had (for some days only) a mainboard with 4 sockets and 4 microprocessors with 16 cores each, so a total of 64 cores. seems that it is not allowing caching the NTFS that is seen by windows, and Windows only can cache writes done to the HDD itself.
but, copying small files makes speed goes down to near 1KiB/s with write cache on. With VeraCrypt encryption, speed can not be 1GiB/s, and goes down to arround 100MiB/s, CPU is not enought fast, among it has 64 cores (i will explain it later how to improve it).Copying a huge big large file (more than 600GiB file) on non encrypted fly, took a little less than 10 minutes), copying a huge amount of really very small files (with write cache on) makes same speed, please note that write such huge amount of really very small files without write cache tooks forever, aka speed goes down to a 1KiB/s (yes kilobyte), all theese tests without encryption.Encrypted with TrueCrypt, veraCrypt, DiskCryptor or any other will make read and write to be much more slower, the best i got is arrond 100MiB/s (one tenth of non encrypted), so encryption makes it to be ten times slower.
My tests with a USB 3.1 Gen 2 Type C hard disk (able to write at 10Gib/s, aka a little more than 1GiB/s) is:
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