The only significant difference between RTGS and NEFT systems is that, the settlement of funds happens in real time in the former where as in the later, it happens only during the fixed time in a day.
To explain in detail, the settlements in RTGS happen as and when they initiate. If the remitter initiates the fund transfer process from his end, the Beneficiary on the other end should receive the amount as soon the process is completed. Or in the worst case, the beneficiary account credit may take up to 2 hours.
In NEFT system, the settlements happen 6 times in normal working days at designated times and 3 times on a Saturday. So if there is any transaction initiated after any designated time, then it will be held up till the next designated time comes in that day (or the next day). There is no minimum or maximum amount required to transfer funds using NEFT system unlike the RTGS, where you need minimum Rs.1 lakh to initiate a transfer.
Note that not all branches of a bank participate in NEFT or RTGS transfers and one must be sure that the beneficiary’s bank supports’ the system needed before the transfer is initiated.
To know the complete list of branches of a Bank that take part in NEFT system visit this page.
Also see: SBI Bank IFSC codes
If you want to transfer funds through NEFT or RTGS using SBI Online banking, you may login to your account and select Inter bank transfer from the Payments/Transfers tab. If you want to transfer funds to your own account (in another branch but same bank), then you may select Funds transfer and proceed with the required details.