[SOLVED] 3gbps interface vs 6gbps interface

[sdzshn3]

Hi guys, currently i have ECS H61H2-M6 (V2.0). It doesn't have USB 3.0 that's why im going to buy the motherboard of Dell Optiplex 7010 or HP Compaq pro 6300 Micro tower.

The major differences between them is current board doesn't have USB 3.0 and it had Storage SATA speed of 3gb/s maximum. And the new motherboard is either 75 or 77 series having USB 3.0 and Storage SATA interface of 6GB/s.
My harddisk is 1tb 7200rpm 6gb/s

Now my question is, because of motherboard change and the speed of hard disk increase to 6gbps, how much improvement can i expect in performance?

I'll also buy one more 8GB ram to make the total of 16GB. So, how can performance increases after adding 8gb ram more? As of now with 8gb ram, my pc ram fills about 85% when i run Android Studio, Android Virtual Device and Chrome with multiple tabs.

Which change will effect more? Changing board or RAM?
How will be the performance of i do both?

 

[USAFRet]

For a spinning hard drive, you'll see zero performance change with SATA II (3Gb/s) vs SATA III (6Gb/s).
Zero change.

The HDD cannot saturate the SATA II connection.

If you were using an SSD, then you would see a performance benefit.

 

[kanewolf]

Very little. Mechanical hard drives don't max out a 3Gb interface in most cases. A 3Gb interface can support 240MB/s which is just over what most mechanical hard drives can burst. 100MB/s is a typical sustained transfer rate on a mechanical hard drive. You will get no benefit.