SSD slow performance

[xFrancky]

Hello,
I'm having low performance on my new Samsung 850 PRO 256GB SSD.
My two SSD are plugged in the white SATA 3 6GB/s port.
I have a brand new Sata 3 6GB/s cable for my Samsung 850 PRO.
Here's my low performance on my 850 PRO : http://i.imgur.com/AT6nBmN.png
Does my PSU is too bad ?
I'm in AHCI in the BIOS.

My Computer
CASE : Zalman Z11(6 Fan)
MOBO : Gigabyte GA-Z77X-D3H Socket 1155 Intel Z77 Chipset
CPU : I5 3570k (OC At 4.3)
Cooler : Cooler Master Hyper 212 EVO(2 Fan)
Graphic Card : Gtx 980 Msi Gaming 4G(OC At 1416Mhz)(3 Monitor plugged)(NEW)
Memory : Corsair Vengeance Blue 8GB (2x4GB) DDR3 1600MHz CL9 1.5V DIMMs (CMZ8GX3M2A1600C9B)
First HDD : WD Black (WD1002FAEX) 1000GB (1TB) SATA3
Second HDD : WDC5000AAKS 500GB SATA 3(OLD)
First SSD : OCZ Vertex 3 120GB(OS DRIVE)
Second SSD(NEW) : Samsung 850 PRO 256GB
DVD Writer : ASUS (DRW-24B1ST/BLK/B) Internal 24x DVD Writer, OEM| Black, SATA | Windows 8 Ready
PSU : Corsair Builder Series Modular CX600M 600 Watt 80 PLUS Bronze Certified Power Supply (CP-9020060-NA)

Thank you, i'm waiting for an anwser !

 

[Carfax83]

I have an 850 Pro 1TB SSD, and I get well over 500 MB/s in both read and write so something is definitely up with yours.

Do you have Intel RST installed? If not, install it and then click on manage, then advanced, and take a screenshot. That will tell you if you really are running in SATA 3 mode..

 

[Tech_Greek]

Make you're plugged into the SATA III ports and not SATA II. I wouldn't pay attention to the color but the port designations.

SATA 0/1 are the ports you'll want to be plugged into as SATA 2-5 are SATA II and then you get another set (slower) SATA III ports on SATA 6/7

 

[xFrancky]

I have Samsung Magicien it say that I am in SATA 3..
http://www.gigabyte.com/fileupload/product/2/4144/5890.jpg
I'm in gray port like they said for SATA 6GB/s..
Yes I have RST Enable in bios.

EDIT : Downloaded RST.. They say that I am plugged into advanced SATA.(Probably SATA 3)
I did a benchmark and nothing changed with RST.

 

[hawtdawg]

Make sure you're using the Intel SATA ports and not the Marvel SATA ports. Had this exact problem with my Vertex 4. The Marvel ports are simply not as fast as the Intel ports, even though they're SATA 3

 

[xFrancky]

I only have 2 SATA 6GB/S ! If they are marvel or not. I don't have more SATA 6GB/S port !! Do I have to change my MOBO ?

I'll shut off and place HDD on SATA 3 and my SSD on my SATA 2 ports. I'll be right back with a benchmark soon !

 

[xFrancky]

They got -100MB's write and -100MB's read with my changed port. I'll revert that .. I have like 265MB/s write and 256MB/s read on my 850 Pro and OCZ.

 

[Carfax83]

You have to have it connected to the wrong SATA 3 port. That's the only logical explanation.

I checked Gigabyte's website, and your board has FOUR SATA 3 ports. Two Marvell, and two Intel..

Like hawtdawg said, make sure you're using the Intel and not the Marvell ports..

Check your motherboard manual to see which one is which.

 

[xFrancky]

Oh .. I will kill Gigabyte for that.
http://i.imgur.com/hSc5rzj.png
But on the website :
http://www.gigabyte.com/fileupload/product/2/4144/5890.jpg
I tried to look for the manual at the start but I didn't find it so !
I'll try that ! Thank you so much !

EDIT: That gtx 980 was hiding those port.. God I hate my self.

 

[xFrancky]

Hell yeah ! This is working fine !
I have an other question.
Samsung 850 PRO OS + Games
OCZ Vertex for EXTRA GAMES
or
OCZ Vertex OS
Samsung 850 PRO Games
I want the best performance for my games.

 

[Carfax83]

What are your scores now?

If you want the best performance for your games, then I'd definitely load them on the Samsung 850 Pro as it's much faster. I'd also put the OS on the 850 pro as well..

If it were me, I'd use the Samsung 850 Pro for the OS and newer games which are more system intensive. For older games, I'd use the Vertex..

 

[xFrancky]

http://i.imgur.com/uSxleEK.png
The top one is Samsung 850 PRo.
|Read| - |Write|
|Random Read| - |Random Write|
Sorry for those french score !

I will do like you said ! I'll do a fresh OS install ony my Samsung and I will format my OCZ.
Thank you !

 

[Tech_Greek]

That was wayyyy too close to SATA2 speeds to not be in those ports. Glad you found the issue