It seems that Gainward engineers developed a universal custom PCB suitable for both GTX 570 and GTX 580. It has 8-pin and 6-pin supplementary power connectors as well as a 384-bit bus, both suitable for GTX 580. It’s just that GTX 570 lacks 2 memory chips and has the bus reduced to 320-bit. The aforementioned 8-pin power connector promises a certain overclocking stability reserve. However, the layout in general is based on the reference one.
GeForce GTX 580/570 cards require supplementary power: reference GTX 570 has two 6-pin connectors, while GTX 580 — and Gainward’s GTX 570 — has one 8-pin and one 6-pin connector.
- READ MORE (Source): iXBT Labs – Gainward GeForce GTX 570 1280MB “Golden Sample” Goes Like Hell – Page 1: Intro, design, cooling, bundle, box