Hi everyone,
Lately all of my google searches are from Win-RAID, so I signed up 
Anyway, the title says it all, I built 2 systems, one for myself, one for my brother, used 2x1TB Samsung 850 Pro’s on mine and 2x512MB Samsung 850 Pro’s on my brother’s (+3TB WD Black HDD) (Tested the system wit the 3TB physically removed - no change)
The 1TB one has ~1040MB/s sequential read/write speeds
The 512MB one has ~530MB/s sequential read/write speeds
Everything is idential down to the iRST’s - 14.5.0.1081, the BIOS’s are latest (MSI Z170I Gaming Pro AC motherboard) - I’ve run the Intel Driver utility, it didn’t suggest any updates either
Both of the OS’s are from the same source, they are Windows 10 - 64Pro’s - the only change is that we had to re-install the OS on the 512 1-2 times, I also suspect my brother might have swapped the Raid0 drives after the initial setup at one point (before the OS install, after the Raid0 setup) (5% possibility, not sure)
Both of the OS’s are pretty bare, nothing to slow them down at this magnitude
(Both of the Raid0’s use the Sata1+Sata2, same BIOS settings too)
(Both the iRST settings are same/default ones, also tried disabling the Cache, no change)
TL;DR: The 512MB Raid0 doesn’t perform, I’m out of ideas myself
@ kaan:
Welcome at Win-RAID Forum!
I really doubt, that the extremely different benchmark results are caused by the SSDs resp.by their different size, and suspect, that the speed of your brother’s system is limited by something else, for example by the RAM modules.
Recently I got a very similar problem with my Z68 RAID0 system (2x256 GB Samsung 850 Pro). Afrter having replaced the budget RAM modules by better ones, I got the benchmark results doubled.
My advice: Check the BIOS settings regarding the memory. Replace the RAM modules of your brother’s system by your currently running ones and look, what happens.
Good luck!
Dieter (alias Fernando)
Thanks Fernando!
That is very very very interesting, funky things are going on with both builds by the way, my build has high SSD speeds, but either my RAM or CPU is faulty, my memtest86’s are failing (only with multi-cpu, I suspect my motherboard/cpu is faulty), his memtest86’s are flawless, his system runs flawlessly, no freezes/BSOD’s yet, yet his SSD’s are slow
Both builds are roughly this: http://pcpartpicker.com/p/MqnZYJ by the way
The speed of the SSD didn’t change whether XMP was on or off, and the RAM is supposed to be one of the most reliable ones out there, the CPU/RAM benchmarks also have no issues on both systems
I would appreciate further debugging ideas
– – –
Off topic-ish: I think I’m going to break the Raid0’s and installations, give one of my 1TB’s to him, take 512MB from him, and set things up as regular 1TB+512MB’s - really regretted Raid0’ing things, there are many points of failures with system builds, Raid0 is just too risky as it seems, If I could do it all over again, I would definitely get 2TB + 1TB single drives
Another Theory, while setting up the Raid0 with Ctrl+I, the 3TB drive was present, however it always stayed non-raid, I wonder whether the Intel Raid Setup capped the Raid0 to a low speed
It would explain why removing the 3TB doesn’t increase the speed, same setup, without the 3TB from the beg. could have a higher speed, but this is another wild theory
I also have 0 idea how Raid0 is setup and handled
As an update/solution, Svet over at MSI forums solved my issue: https://forum-en.msi.com/index.php?topic=262440
These http://www.amazon.com/Silverstone-Non-Sc…/dp/B005U8XJDW/ cables were to blame, it seems some of them are running at 3GB/s
Considering this: https://www.pugetsystems.com/labs/articl…-Revisited-183/ - Sata2 cables delivering Sata3, a Sata3 cable not delivering Sata3 is …