Top critical review
Decent upgrade if coming from HDD. If not, get something else.
July 25, 2018
Does not even get close to advertised speeds.
Not talking about sustained read/write, but peak numbers for less than 10GB data (pretty common).
I have a "ssd only" rig, so i can say others are much closer to manufacturer claims, and most are even spot on.
Write speed is round 350MB/s for the first 5-10GB (connected to an intel controller (vs AsMedia etc),
after that it drops to around 180, and then over the next 10GB it continuously dropped in speed to about 100-120MB/s.
Basically gets slower the more you write to it (in a continuous fashion),
and needs a bit time to "recover" to full speed (e.g. SLC cache needs to get written to Nand).
Given that this has large amounts of SLC cache build in and that its based on the newest (3D) Nand, its pretty slow.
My +5y old OCZ Vector does 400MB/s read, and easily 350MB/s write.
Not that you would see that kind of data transfer on a regular basis/user, but still, performance near anywhere what i expected.
especially since a review on guru3d looked pretty good.
Not that it would matter for a regular user, nor do i mind it myself, as it was the best price (256GB),
and its only for my games (mainly read, not write) and couldn't find any OCZ vector/vector 180 for cheaper.
I only have SSDs (couple crucial ssd), so i don't want to risc catastrophic failure by using only one brand/model.
If you need something that performs better (especially if its the only drive, or the one for OS),
look for samsung evo 860 till 960, crucial MX300 (build in power backup),
crucial MX500 (newer and doesn't have backup power in form of capacitors like the 300, but crucial claims its not needed anymore).
or if its a good price:
OCZ vector 180 (build in backup power), or one of the newer toshiba drives (check reviews on guru3d as im not up-to-date on those),
as they offer advanced replacement if drive is/gets defective...
Another thing i don't like: S.M.A.R.T. data/sensor info is about 30-50% of other brands, so less easy to detect potential problems.
I mean my smallest and cheapest drive is a SP 60GB, and even that shows double the amount of info.
The benchmark was done with AS SSD benchmark on freshly formatted drive, test file 1GB size as its the stock setting.
First pic is the SP A55 (256GB), second one is my 5y Vector with roughly 30TB writes to Nand, to compare
(and its 128GB which are usually slower than same model in ~250GB).