I bought a new psu for my pc. It only has pcie power cables on it, but my vid card is agp. Cable adaptors?

R there cable adaptors to convert the pcie power cable off my psu to the agp power connector on the board? The agp has simple 4 pins for power on the cca, but the power from the new psu is the 6 pin pcie connector. Please tell me a special cable adaptor exists?