How to increase the speed of an SSD?

Question

Samsung

Good day to all! :) I
bought a new SSD Samsung 850 PRO 256GB a couple of days ago

I decided to test the speed, and I was not pleasantly surprised by the result, the numbers are very low from those declared by the manufacturer: Read speed: up to 550 MB / s Write speed: up to 520 MB / s

Test result:

The SSD is connected to a 6GB/s SATA port.
BIOS has AHCI enabled.
1. Tried uninstalling the Samsung Magician utility, and testing the speed with a new one,
2. Changed the SATA cable, and switched to another SATA port.
The result hasn't changed.
ASUS V FORMULA motherboard model
https://www.asus.com/ua/Motherboards/MAXIMUS_V_FORMULA/
OS Windows 10.
Maybe someone has some ideas on this situation.
I will be glad to any idea in search of the given problem.
The guys seem to have found the problem ... but I still do not fully understand the reasons.

Lots of pictures:

1. прикрепляю фото то как было у меня подключено изначально
При таком подключение BIOS в разделе AHCI не видел SAMSUNG PRO.

2. Отключил KINGSTON и на место его подключил SAMSUNG. Зашел в BIOS и вижу что SSD определился
3. Сейчас у меня подключено 2 SSD на одной SATA шине.

Загрузился, проверил скорость SSD, и вот чудо всё как надо.

Judging from the problem, I have 4 SATA ports that do not want to work in AHCI mode.
Although if you connect an SSD to them, the system sees it, in the device manager it will show that this SSD is operating in AHCI mode ....
Does anyone have any thoughts?

Answer 1

It's simple, before buying new components for a non-new computer, you should check the characteristics of the existing hardware.
From the specifications from the asus website at the link you provided
Intel® Z77 chipset :
2 x SATA 6Gb/s ports (gray), (Red)
2 x SATA 3Gb/s port (black), (Black)
1 x External SATA, (Red)
1 x mini-SATA 3Gb/s port(s) , (Black)
Support Raid 0, 1, 5, 10
Supports Intel® Smart Response Technology, Intel® Rapid Start Technology, Intel® Smart Connect Technology *4
ASMedia® PCIe SATA controller : *5
4 x SATA 6Gb/s ports (gray), (Red)
In total, not all sata ports are equally useful, the Z77 chipset only supports two sata3 ports. True, the specifications and the picture with the description on their website contradict each other, so open the instructions and connect the SSD to ports with sata3 support and you will have the promised speeds.

Answer 2

Judging from the problem, I have 4 SATA ports that do not want to work in AHCI mode.

The type of interface does not affect the data transfer rate, it's just that AHCI is more modern and supports a wider set of commands.
On the problem - most likely a glitch of a particular motherboard.
Problems arise with such models on a regular basis.

Answer 3

1. Under the SSD, the motherboard has its own fast SATA slots. Connect to them, it will probably work faster.
2. In general, I recommend reading tests before buying. It is clear that all models will not be tested, but you will at least know the balance of power in the market.
3. It's better to use CrystalDiskMark to check it yourself.