This has bothered me for quite some time, and I have searched and searched to no avail. Everyone just states to plug the SSD into the 2 available Intel Sata controllers, which I have done for my main OS SSD and Primary Gaming SSD. However I have one leftover SSD that I use for non-essential programs, and I would like to be able to at least allow trim to be used on it. Samsung magician see's it as an HDD and wants to defrag it instead of trim it with scheduler enabled.
 


The 3 SSD setups are as follows:
Intel Sata Controller
Samsung 850 EVO 250GB (OS) - This was in the system before the 500GB, or else I would have ran the OS off the 500GB
Samsung 850 EVO 1TB (Steam/Games)
Marvell Sata Controller
Samsung 850 EVO 500GB (Misc/Apps)

I know this puppy is 6 years old in my system and I should just upgrade, and I plan to once the Z390 Dark comes out, but for now I want to keep on trucking. Any advice would be appreciated!

Also, side question, in the board snapshot you can see there's motherboard switches to turn off the PCI-E lanes. If I'm only using 1 lane (1) for my GPU, should I just disable the others? Does this help at all with power consumption or stability? I've been kind of on a last hoorah with this machine, I recently had my old 980 TI FTW RMA'd after having severe coilwhine on it, and I never OC'd GPU's before. So I've been having fun starting fresh with that, but wasn't sure if disabling other PCI-E lanes would help with power delivery.
 


Thanks again!

Came back with 0 so it's on, but my problem isn't with windows trim, it works for the 2 SSD's on the Intel SATA Controller, it just doesn't work for the SSD on the Marvell controller. I sent a email request to Customer Service, and they stated due to the age of the board it's likely not going to be fixed and I must have just found a glitch.

Guess I'm just SOL on the 3rd SSD. Bummer.

My dear Z77 FTW Motherboard still serve guy who bought from me and my overclocked i7-3770K from 2012.
That's still good hardware, I'm crazy because thought to replace X99 so early.
In future new platform every time when DDR standard change, not before.
I would like again to have EVGA premium motherboard and same CPU sample as i7-3770K.
 
Why EVGA not launch something cool as P67, Z68 FTW, SR-2...
I remember P67 FTW with Heatkiller Waterblock... Amazing hardware, now these RGB craps destroy image of PC.
No matter how much money you invest look similar because RGB. 
RGB make to hardware look cheaper, and on first ball amateur could think that 1500$ worth hardware is more powerfull than 5000$ worth hardware.
If you disable RGB than you have real image.
 
I like motherboards with fans as well, EVGA X299 Dark example, Z77 FTW, SR-2... all of them were cool.