Four RAID 0 Samsung 850 EVO 120gb speeds not at its full potential

[Essentia]

Hello people,

 

So I've recently bought four samsung 850 evo 120gb  ssds, 

I made it so theyre all RAID 0 running on sata 3 ports. 

And their potential is 520 Mbps read and 500~ Mbps read speeds

 

So, as it happens all im getting is 1.6k Mbps read and 1.3k Mbps write speeds.

The same was when i was running on 2 ssds i had 800 Mbps read and 600 mbps write speeds

 

I've checked out most of the similar solution cases that people already opened and fixed their rig, but i haven't found any solution to my own problem

 

 

So what i've tried was runing those ssds on:

1)

Intel® Desktop Board DZ77RE-75K Extreme Series

And wolia! Raid 0 2x samsung 850 evo Running over 1.1k~~ Mbps read and 1k mpbs write.

 

So now i know its possible to run at their full potential speeds.

 

 

2) I've tried benchmarking each ssd separately while in AHCI mode

Every ssd runs 520-550 mbps read and 500-530mbps write just as they should.

 

So now i know every ssd is perfect condition.. 

And the question is why im not getting full speeds While RAID 0?

 

3) Samsung Magician. Everything is up to date, running on max performance.

 

 

Guys, please HELP!!! "Desperate" :wacko:

 

My rig:

MSI Z97 Gaming 7, LGA 1150, with 8 sata 3 ports (im using 1,2,3,4th ports for the ssds)

I7-4790k Devil's Canyon Cpu

Vengeance Rams 4x4GB running at 2400mhz

1200Watt Be quiet! hybrid power supply

SLI 2x Evga 760 SC 2gb Graphics cards

Zalman cpu cooler

4x samsung 850 evo ssds

Fractal design Define R4 case

[TheMcSame]

RAID 0 is like multi GPU setups, it rarely scales perfectly.

[Enderman]

this is why you should not use raid

if you need speeds like this (which you probably dont) buy a PCIe or NVMe SSD

 

doing raid 0 is just a waste of money and uneccessary problems

[Essentia]

But you see the thing is i've tried them Intel LGA 1155 on sata 3motherboard and they worked perfectly fine and at full speed!!!

[Essentia]

And I'm really into this, So please any suggestion is a help to me.

[Essentia]

I know that i'm trying to reach theorical speeds.

 

But what doesn't let me stay calm is that while using 2x ssd the speed was 800mbps read

While on the intel-75k MB the speed was a bit over 1k mbps read

[dfsdfgfkjsefoiqzemnd]

Might be an issue with the SATA controller on your MSI board, or perhaps you haven't installed all drivers. 

 

Never tried 4 SSDs in RAID because my onboard chipset only has 2 SATA3 ports, but for some reason on my own MSI board (Z77A-GD65 Gaming) 2 850PRO SSDs in RAID 0 scaled almost perfectly with the Intel drivers (Rapid storage, rapid start, etc etc) installed and only did about 800MB/s without the drivers.

[Deli]

I remember JJ from Asus said the Z97(also Z87) DMI bandwidth is 1,600MB/s. Three SSDs in raid 0 will be enough to saturate it. 

[scottyseng]

Yeah, you're hitting the max bandwidth of the Intel Chipset as stated above. If you want to break that barrier, you need a dedicated RAID card (Which probably costs more than all four of your SSDs alone for a proper one). I think three SSDs are as fast as you go. Otherwise, you might look into NVMe.

[Essentia]

So, What i've been thinking is that its the drivers. Sata controller may be not working at its fullest.

 

I noticed something after recieving new updates.

Theres an available raid driver update right? so i Update it, everything goes through smoothly, restart the pc, and then i scan again for any more drivers and it still shows me that i havent installed the raid driver update. ???

 

what?

 

 

 

SOLUTION: 

Installing the same update from the Official MSI website fixed the Live UPDATE 6 vision.

[Essentia]

Also here are Device manager, different Benchmarks, some bios screenshots and system ratings which i just thought of dropping in.

 

 

 

It feels as if im only using 3 ssds insstead of 4 ??

[Essentia]

I know that I've hit the 1.6k mbps "limit" BUT This doesn't change the fact that running on 2x RAID ssds The speed was a bit lower than 800mbps read. 

 

As much as it sounds bizarre what im trying to achieve. I've got a feeling that its possible to reach atleast 100mbps read/write more.

 

It may seem due to benchmarks that im running on 3 ssds, but the fact is that each ssd is slowed by 100mbps read/write speeds.

Regardless of how many RAID 0 ssds are connected.

[Sakkura]

I remember JJ from Asus said the Z97(also Z87) DMI bandwidth is 1,600MB/s. Three SSDs in raid 0 will be enough to saturate it. 

 

Z97 has the same DMI 2.0 connection as Z77 does. That's 20 Gb/s, or 2 GB/s when overhead is taken into account. Capping at 1600 MB/s is a bit on the low side, I would have expected closer to 1700-1800 MB/s, but meh... not a huge deficit. And it's a silly configuration anyway.

[Essentia]

Yes that is what im expecting. I've created a new topic regarding the m.2 to pci-e

 

http://linustechtips.com/main/topic/408669-m2-to-sata-e-raid-0-possible/