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What would be the best Adapter and blade SSD (256GB) combination for a mid 2010 Mac Pro ? I am a tech noob so I would like something plug'n play...I heard that there are some issues with the TRIMM and that there are a lot of adapters and blades like samsung 950/951 etc...and some are not compatible with the other and so on...what would be the best "pair" to buy for my Mac Pro 2010, for best performance....?
You need a AHCI based SSD/controller combo NOT a NVMe one. There are complete sets available from Angelbird MX2 that are even trim compatible out of the box. You reach about 800 to 900 MB/sec, and they work out of the box.
The following is a well regarded source for Mac SSDs and they have PCIe kits for the 2010 Mac Pro: https://eshop.macsales.com/shop/ssd/owc/mac-pro/2009-2012
As per the other replies it is possible to get a standard SSD e.g. a Samsung 950 and fit it via a PCIe adapter. It can be formatted and used as a bootable drive for OS X and these days Apple do allow turning on TRIM support for third-party SSD drives like this Samsung. One important issue though is that the Mac does not support booting from a NVMe type SSD and only supports booting from a AHCI type SSD. You need to pay attention to this as Samsung make both types.
This article shows how to enable TRIM for third-party drives in Yosemite and later - http://www.howtogeek.com/222077/how-to-enable-trim-for-third-party-ssds-on-mac-o s-x/
If you want the simplest most compatible option, then you can get a second-hand genuine Apple SSD as would have been fitted to a MacBook Pro Retina 2015 model and fit this via a PCIe adapter. Being that this is a genuine Apple SSD drive it will of course support Apple's TRIM as standard. This particular SSD is a custom Samsung SSUBX and has a proprietary Apple connector so you need a different PCIe adapter to a standard Samsung SSD which uses a standard M2 connector.
The Apple SSUBX 1TB model from a MacBook Pro Retina 2015 is as fast as you can go with a single SSD drive. The latest Samsung own brand models should be a similar speed.
This should be an example of a suitable PCIe adapter for a genuine Apple SSD - http://www.ebay.co.uk/itm/Adapter-Card-to-PCI-E-X4-for-apple-2013-2014-2015-MacB ook-Air-A1465-A1466-SSD-WT-/152097155927…
Mac Pro 2010 PCIe SSD upgrade
