My new MSI 560ti 448 will arrive shortly and I bought a new psu to go with it, CM Silent Pro M 700W. It's a single-rail design which I've never used before. With my old power supply and gpu, I was told to use a MOLEX-to-PCIE adapter to get the required current as I only had 16A per rail. With new power supply, I don't think this would be an necessary but I'd rather make sure beforehand.
Will I still have to use the MOLEX adapter or due to the single rail design will I be able to just use a single PCI-E cable with two 6-pin connectors on the end to supply the necessary current?
Any modern 700w psu including yours, will have sufficient pcie 6 or 6/8 pin connectors, so the molex adapters are not necessary.
Most psu's are all really a single rail design. The division into multiple 12v rails is really only an accomodation to UL to limit the amount of current for safety reasons.