A Vietnamese retailer seems to be already unreleased Radeon RX 500 graphics cards, and it seems that the folks from from a Vietnamese website called Genk went ahead and purchased a HIS Radeon RX 570 IceQ X2. 

The HIS Radeon RX 570 IceQ X2 is based on Polaris 20 GPU and clocks in at 1244 MHz. This  RX 570 IceQ X2 has 2048 Stream Processors which is similar to the RX 470. The model HIS RX 570 graphics card has been fitted with 4GB GDDR5 memory rated at 7 GHz effective data-rate. The card from HIS looks identical to its predecessor HIS RX 470 IceQX2, which has a GPU clock at 1226 MHz, so we are looking at a small performance boost when compared to the RX 470.Connectivity wise, you will spot 1x DVI-I port, 2x DisplayPort 1.4 and 2x HDMI 2.0b ports. It also features a 8-pin PCIe connector for a bit of extra power. We do not have any information regarding the pricing and availability of this card but it is expected to be available on the general market soon. It is rumored that next week the series Rx 500 will be released.