will these work in a RAID1 environment?

I'm not a tech but I wouldn't see why not. Once formatted and activated like any other hard drive to me. I would however format by some other means, in the format you plan to use, as in, on another PC or external drive bay etc. first. That way in your set up your system will see a partition available.

Does the new Adata SU650 upgrade my Su635 and come with an operating system. Asking for myself. ?

it may hold more gb that the su635 it does not have an operating system on it you will need to install your choice of OS

Does it have a DRAM cache?

Per their data sheet it only has standard SLC caching, paired with ECC error correction. You can find this on their site on a model by model basis.

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ADATA Ultimate SU650 2.5" 120GB SATA III 3D NAND Internal Solid State Drive (SSD) ASU650SS-120GT-R

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2.5"
120GB
SATA III

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Specs

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Learn more about the ADATA ASU650SS-120GT-R

Model
Brand	ADATA
Series	Ultimate SU650
Model	ASU650SS-120GT-R
Device Type	Internal Solid State Drive (SSD)
Used For	Consumer

Details
Form Factor	2.5"
Capacity	120GB
Memory Components	3D NAND
Interface	SATA III

Performance
Max Sequential Read	ATTO: Up to 520 MB/s CDM-QD32T1: Up to 520 MB/s AS SSD: Up to 500 MB/s
Max Sequential Write	ATTO: Up to 320 MB/s CDM-QD32T1: Up to 320 MB/s AS SSD: Up to 300 MB/s
4KB Random Read	Up to 20,000 IOPS
4KB Random Write	Up to 75,000 IOPS
MTBF	2,000,000 hours

Features
Features	TBW: 70TB 3D NAND Flash for higher durability and capacity SLC caching: enhances transmission speed Wide capacity range: 60GB to 960GB Advanced error correction Tougher, quieter, and more reliable than HDDs Supports ADATA proprietary software - SSD Toolbox and Migration Utility

Environmental
Operating Temperature	0°C ~ +70°C
Storage Temperature	-40°C ~ +85°C
Max Shock Resistance	1500G / 0.5 ms

Dimensions & Weight
Height	7.00mm
Width	69.85mm
Depth	100.45mm
Weight	47.50g

Additional Information
First Listed on Newegg	September 23, 2019

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