PCI Express x1 Slot Speed

[berny22]

So I have a Samsung 850 EVO SSD that is running on a SATA II port because my MBO doesn't have a SATA III port.

So I've seen many PCIE x1 extension cards that have SATA III ports. So I've been wondering if PCIE x1 slots can are as fast as my SSD? My SSD has around 500 mb/s read and write, so I need the PCIE x1 slot to have the same or higher speed. Is it worth buying a PCIE x1 card or should I buy a whole new MBO?

 

[Sapphire Thunder]

that depends what PCI-E version it is. If it's new motherboard from last 3-4 years, it is probably PCI-E 3.0, meaning 1-lane in it (x1) can do 984.6MB/s
If it's PCI-E 2.0, it can do exactly 500MB/s.

 

[berny22]

that depends what PCI-E version it is. If it's new motherboard from last 3-4 years, it is probably PCI-E 3.0, meaning 1-lane in it (x1) can do 984.6MB/s
If it's PCI-E 2.0, it can do exactly 500MB/s.

It is a PCI-E 2.0. So its' max speed is 500 MB/s. And SSD max speed is also around 500 MB/s.
Are there any other reasons I shouldn't buy the extension card? Or should I feel free to buy it?

 

[k1114]

Unless you are doing something that would be sequential, you are not going to see a performance difference.

 

[berny22]

Unless you are doing something that would be sequential, you are not going to see a performance difference.

Hey about that can you explain what sequential means. And what are those speed test actually showing you?

 

[k1114]

http://www.anandtech.com/show/8747/samsung-ssd-850-evo-review/8 The max speed is for sequential. In random or most any average workload you'd only be expecting around 300MBps so sata 2 is perfectly fine. The real performance increase from ssds is access times, not max read/write speeds depending on the work. What do you use your pc for?