2x128gb ssd in raid 0 or single 256gb ssd?

[08shantanu]

Which will be faster?

2x128gb ssd in raid 0
OR
256gb single ssd?

 

[Geef]

With SSD drives it is larger is better. up to 240GB is good but then 256GB+ is faster. From what I understand its because 256+ has more channels to read/write to and from the SSD. This link explains it better than I can. https://www.howtogeek.com/248827/why-are-smaller-ssds-slower/

 

[R_1]

one SSD or three SSD's you will be limited by the SATA bus which each drive alone can saturate. get the single larger drive.
Redundant Array of Inexpensive Disks or RAID
3 drives AID-0 or a single drive will still be limited to a single failure and kaput. get the largest drive you can afford.
2 drives will throttle to the speed of a single drive anyway, only so much room on the SATA Bus.

 

[Solandri]

Most 128 GB SSDs use half the number of flash dies internally as 256 GB SSDs. So the 256 GB is essentially two 128 GB SSDs in RAID-0 internally.

Setting up an external RAID-0 is mostly pointless on SSDs. Because it's external and because SSDs are so fast, the extra RAID overhead ends up slowing things down compared to running a single SSD at small file requests. RAID-0 does speed up large sequential file requests. But those aren't actually that common (outside a few tasks like real-time video editing), and represent only a small fraction of the time you spend waiting for your SSD to complete a read/write.

http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485.html

tl;dr - get the 256 GB SSD.