A dual-GPU system is generally possible with the Y70, as the case supports ATX, mATX, ITX and E-ATX mainboards and can accommodate graphics cards up to 422 mm long. However, the effort required for such a setup is not insignificant, as the case only offers one vertical GPU slot (incl. PCIe riser) as standard and the second card would have to be mounted horizontally in the lower area of the mainboard. Cooling and space for both cards, especially with high-end models such as the RTX 5090 and 4070 Ti Super, must be critically examined - air circulation can be restricted and compatibility depends heavily on the selected mainboard and the dimensions of the cards. There is no official information on dual GPU support or specific mounting instructions for two GPUs, so it is advisable to check the exact dimensions of both graphics cards and the mainboard before purchasing and to plan the cooling solution carefully. If you have any uncertainties or special requirements, it is worth discussing them in the Community or contacting the manufacturer directly.