few days ago I won in some competition Adata SSD disc SP 900 and I normally installed to my old computer, and when I ran some benchmarks, I noticed it got nearly same write and read speed as my normal classic hdd (see picture: )
I plug my ssd in sata II and run in IDE mode cause my motherboard is not supporting ahci. Shouldnt it be a little bit more faster than image shows? Can I make it somehow to run faster??
My motherboard is Gigabyte GA-M61PME-S2 - nForce 430
You are right about on target to where you should be, performance wise. The nForce 430 chipset of your motherboard does not support AHCI and will also only detect your SATA III SSD as SATA I and only run it as such. There was a firmware work-around one company implemented, but ADATA is not it. 2nd, the Sandforce controller in your SSD is best utilized when the DATA being handled is compressible, otherwise it's transfer rate can easily be cut in half. If you want better speeds, you need a better SATA controller.
On another note, since SSDs have a limited number of write cycles that each cell can perform, it is advisable not to do a lot of benchmarking of them. It can shorten the drive's usable life. Also, make sure disk defragmenting is also turned off for that drive. Windows Vista and newer should have a scheduled task to defragment the drive once a week, and this can hammer on the drive's write cycle limitation. If your controller is not properly seeing the drive, it's possible Windows has not identified the drive and disabled the automatic defragmentation for you, so you would be advised to check, just in case. :-)
It might seem to be a cheaper solution in the mean time to install an aftermarket SATA III add-in controller instead of upgrading your motherboard, but I don't recommend going that route. If it's not PCIe x4 or higher in it's connectivity to the system, you'll bottleneck again. Since your motherboard only has a single PCIe x16 and a single PCIe x1 slot, if you have a discreet graphics card, you're stuck with a PCIe x1 controller card being your best solution.