840 Pro and 840
The 840 Pro is Samsung's flagship SSD series. For an in-depth review of the hardware inside, please have a look at our original Samsung 840 Pro review. The 840 Pro is available in three capacities: 128 GB (£122), 256 GB (£206) and 512 GB (£432). That translates to £0.95 per GB, £0.80 per GB and £0.84 per GB, respectively. They all come with Samsung's own data migration software, and five year's of warranty. Here are the specs:
| General | |||
|---|---|---|---|
 |  |  | |
| Brand | Samsung | Samsung | Samsung |
| Product name | 840 Series Pro 128GB | 840 Series Pro 256GB | 840 Series Pro 512GB |
| Product code | MZ-7PD128BW | MZ-7PD256BW | MZ-7PD512BW |
| Details | |||
| Specifications | |||
| Disc type | SSD | SSD | SSD |
| SSD type | Multi-level cell | Multi-level cell | Multi-level cell |
| Quoted capacity | 128 GB | 256 GB | 512 GB |
| Price per gigabyte | £ 0,950 / GB | £ 0,807 / GB | £ 0,837 / GB |
| Rotation speed | 0 rpm | 0 rpm | 0 rpm |
| Cache | 256 MB | 512 MB | 512 MB |
| Size | 2.5 inch | 2.5 inch | 2.5 inch |
| Height | 6.6 mm | 6.6 mm | 6.6 mm |
| Interface | Serial ATA 600 | Serial ATA 600 | Serial ATA 600 |
| SSD controller | Samsung S4LN021X01 | Samsung S4LN021X01 | Samsung S4LN021X01 |
| Power connector | SATA | SATA | SATA |
| Measured capacity | 119.2 GB | 238.5 GB | 476.9 GB |
| Native Command Queuing |  | | |
| TRIM support | | | |
| Read | 530 MB/s | 540 MB/s | 540 MB/s |
| Write | 390 MB/s | 520 MB/s | 520 MB/s |
| Flash chip brand | Samsung | Samsung | Samsung |
| Warranty | 5 jaar | 5 jaar | 5 jaar |
The 840's use the same controller, but instead have Triple Level Cell memory. To learn more about these flash chips, read our original Samsung 840 250 GB review. For normal use this chips are fine according to our calculations, but we'd be cautious if you make intensive use of your PC. The reason for this is that the lifespan can potentially be shorter than with traditional flash chips. It's also why they employ a lot of overprovisioning and have lower available capacities: 120 GB (£84), 250 GB (£147) and 500 GB (£358). That's £0.70 per GB, £0.59 per GB and £0.71 per GB, respectively. That's relatively affordable, but the difference isn't big enough compared to the previous generation, in our opinion. For a little more you can get the kit with 3.5-inch installation bracket, a USB-to-SATA cable and data migrations software. Here are the specs:
| General | |||
|---|---|---|---|
 |  |  | |
| Brand | Samsung | Samsung | Samsung |
| Product name | 840 Series 120GB (basic) | 840 Series 250GB (basic) | 840 Series 500GB (basic) |
| Product code | MZ-7TD120BW | MZ-7TD250BW | MZ-7TD500BW |
| Details | |||
| Specifications | |||
| Disc type | SSD | SSD | SSD |
| SSD type | Triple-level cell | Triple-level cell | Triple-level cell |
| Quoted capacity | 120 GB | 250 GB | 500 GB |
| Price per gigabyte | £ 0,702 / GB | £ 0,588 / GB | £ 0,715 / GB |
| Rotation speed | 0 rpm | 0 rpm | 0 rpm |
| Cache | 512 MB | 512 MB | 512 MB |
| Size | 2.5 inch | 2.5 inch | 2.5 inch |
| Height | 6.6 mm | 6.6 mm | 6.6 mm |
| Interface | Serial ATA 600 | Serial ATA 600 | Serial ATA 600 |
| SSD controller | Samsung S4LN021X01 | Samsung S4LN021X01 | Samsung S4LN021X01 |
| Power connector | SATA | SATA | SATA |
| Measured capacity | 111.8 GB | 232.9 GB | 465.8 GB |
| Native Command Queuing | | | |
| TRIM support | | | |
| Read | 530 MB/s | 540 MB/s | 540 MB/s |
| Write | 130 MB/s | 250 MB/s | 330 MB/s |
| Flash chip brand | Samsung | Samsung | Samsung |
| Warranty | 3 jaar | 3 jaar | 3 jaar |
