Final Words
I have to say I was very skeptical when I first heard that the 840 will use TLC NAND. Samsung kept the TLC/MLC divide between the 840 and 840 Pro quiet until it took the stage at the SSD Summit for good reason. Prior to the 840's launch TLC NAND was mostly used in low cost devices (USB sticks, cheap tablets, etc...)—no one would dare throw a TLC drive into a high performance PC. However, after spending a week with the 840 running various tests, I'm pleasantly surprised. After seeing how slow NAND can impact performance with other drives I didn't have high hopes for the 840 when I heard it used TLC NAND.

Fortunately, the 840 exceeded all our expectations. It's faster, overall, than most of the previous generation MLC NAND based SSDs we have tested, which says a lot about Samsung's skill with it comes to designing a controller and firmware. When you take slower and lower endurance NAND, there is much more you have to do at the controller and firmware level to get things right. You can't sacrifice too much endurance for performance or vice versa. While long term endurance is still unproven, Samsung is definitely upping the ante in terms of low-cost SSD performance.

What's just as surprising is that Samsung is the first manufacturer with a TLC NAND based SSD. Samsung was under no pressure to release a TLC drive but it managed to beat the competition without sacrificing performance. Samsung hasn't been too aggressive in the past, but since the 830 it's clear the company has tapped some new found energy.

Here are some of the performance numbers for the 840 vs the 830 (250/256GB drives, all numbers in MB/s)...
.......................~830~..~840~
Random read........67........84*
Random write.....161.......252*
Sequential read...409.......431*
Sequential write..364*......254
* = fastest drive

Anandtech Storage Benches 2011...
.....................~830~...~840~.~Vertex 4~.~Crucial M4~
Light (typical).....300.......335*....249..........246
Heavy...............231*......214.....222..........162

Successful trade list
Samsung 830 128GB
1) radiancephil
2) edwin_yap_84 - cod'ed
3) MaUi^
4) wiraone
5) syark

Samsung 830 256GB
1) uus831
2)

Samsung 840 120GB
1) BlueDream2
2) bv2427
3) TingTong123
4) Ceinwyn
5) l3lackholeson
6) koceh87
7) jychow
8) homosapient
9) isamir786
10) coolim09k
11) scwong93
12) devilywan88
13) lolzax

Samsung 840 250GB
1) catefyn
2) Abg-SEM
3) Liewzy
4) kcsummer

Crucial M4 128GB
1) Fixgd - cod'ed
2) Syafiq106 - delivered
3) SkyX - delivered
4) kennytsh - delivered
5) wwdev - cod'ed
6) derek87 - delivered
7) SurFerZ - delivered
8) HiT-AbLe - cod'ed
9) veloinvest - cod'ed
10)ericnts5199 - delivered
11)acid427 - delivered
12)ejoe - delivered
13)klch  - delivered x 2 units
14)niks - cod'ed
15)wanakin - delivered
16)hando911 - delivered
17)sevensigns - pending cod
18)Ultima_X - delivered
19)salimbest83 - delivered x2 units
20)ijatneda - delivered
21)Ultima_X - delvered
22)kumprinx - delivered
23)jedi_dc - delivered
24) -JC-
25) KIntos - cod'ed
26) elliah

Crucial M4 256GB
1) Non forum member - cod'ed
2) EightPhantomz - cod'ed
3) ta2_kal - delivered
4) Qim - delivered
5) bashlyner - cod'ed
6) tripleB - cod'ed
7) wingster - cod'ed
8) hoongern - cod'ed
9) ander7724
10) kapla1977
11) dee_death
12) trial03

care to explain more about your warranty? local warranty? where need to send for it?

bro phone no not enough number. how to contact?

interested, any personal warranty?

bro, you got any mSATA from crucial?

7mm 256gb got stock ?