Here's mine...from 1TB.

hey so would exactly part numbers would i need for the 1TB ssd and the wirless card? also does anyone know a repair station that i can send my yoga 2 pro too? 

Hi. I just read your post about sending your computer to the Lenovo Development Center to get your 1TB drive working. I seem to be having the same issue.  My tech support guys re-flashed the BIOS etc etc to no avail. Is there someone you could put me in direct contact with at Lenovo to help me get it working?

The EVO is rated for that, stock SSD is only rated for writes at around 300 (the 256GB one anyway).

So is the Samsung 1TB EVO working for everyone's Yoga Pro 2 at better than stock SSD speeds? 

I've had bad experiences with my lenovos in the past month.  Has the Evo SSD in a yoga pro 2 caused any issues for anyone?

Yes, it works fine. I have a Yoga 2 Pro Model 20266, i7, 8 GB RAM, 256 SSD.

I bought a Samsung SSD EVO mSATA 1 TB at Newegg for $342.92.

I also bought the new Intel Wi-Fi/Bluetooth board, for about $40 at Amazon. 7260NGW Intel® Dual Band Wireless-AC 7260 802.11ac, Dual Band, 2x2 Wi-Fi + Bluetooth 4.0 

I also needed a small Torx screwdriver set for the 11, T-5 screws on the bottom of the ultrabook. About $8 at Amazon.

Lastly, I bought a Sabrent USB 3.0 mSATA II-III/6G SSD Enclosure Adapter UASPEC-UKMS. This was $12.99 at Newegg but shipped from Adorama Camera. Extruded black anodized aluminum and included a cable. A very nice/functional piece of hardware. It is a beautiful thing.

I temporarly put the new 1TB SSD into the USB enclosure. No formatting needed.

I Upgraded the BIOS to version 76CN43WW.

Then I downloaded the Samsung Drive Cloning Software and cloned the 256 SSD (stock drive) to the 1TB SSD in the USB enclosure. This took several hours.

I removed the 11, T-5 screws and pulled the bottom of the ultrabook off near the hinges. It is held in place by strong magnets. Pretty cool design... no broken plastic tabs!

Removed the 1 tiny phillips screw holding the mSATA drive in place.

Swaped the drives. Swapped the W-Fi/Bluetooth card. Re-assembled and booted. Works like new money! 

The only difficult part was the ultra small antenna connectors on the radio card. The ham-fisted need not apply for that job.

Lastly, download and run the Samsung Magician software. Do the OS Optimization. I set the over provisioning to the derfault of 10% or 93.15 GB. Create a Windows System Restore Point.

Option: I set the Samsung Rapid Mode. 

Samsung Magician Benchmarks before/after setting Rapid Mode:

Sequential Read 545/5128.   Sequential Write 512/3983;    Random Read 82624/65928;  Random Write 60440/39821. Rapid mode uses a cache and makes the numbers look wacky, but I like it.

Additional observation about new radio card: Speedtest.net showed my 5G connection is much faster than the old 2.4G connection. I'd quote speed numbers but they are too variable to be useful. Just know that it is more than double on 5G.
That's it. Easy upgrade, a bit over $400 in total but my ultrabook will be useful for another few years and I have a bonus of now owning the most kick-ass, external, 256 GB SSD USB 3.0 drive!

I've been eagerly waiting for the new Yoga 900S announced in January, and apparently it starts shipping in a few days and Lenovo is taking orders now. Unfortunately, the trial units that were sent out in January had 512GB SSDs which is a bit tight, but I suppose I could try to get by with --- Yet the units available for order now are only 128 or 256GB SSD. I've got 128GB USB sticks that are too small to be useful, no way I could get by with one of these tiny drives.

I haven't seen a teardown of the Yoga 900S yet, and the ordeal with upgrading my Yoga 2 to 1TB was such a nightmare that I never even bothered upgrading my Yoga 3 that came with a 512GB... again, it was just enought to be managable. But I miss actually having space, not constantly shuffeling around files...

The specs only say "256GB PCIe SSD" so I'm not sure if this is mSATA again, or something else.

Anyone with a Yoga 900S review unit want to open it up and tell us the specs inside?

If I could get 1TB inside, the 900S looks like an excellent machine!

Hi bruce0,

I'm running Yoga 2 Pro (20266) with Windows 10 and correct drivers installed (Setup Guide).
Samsung 850 EVO 1TB SDD mSata with Magician activated has a noticeable increase in performance and lower power consumption.
CrystalDiskMark 6.0.0 - Benchmark Test
I manually recreated all Lenovo's partitions with OKR Software and kept original OKR functionality.

Regards,