The prototype is equipped with an amazing capacity of 8 GB frame buffer (sixteen SKHynix H5GQ4H24MFR 0.5GB modules [hynix]). Such amount of memory capacity was possible thanks to the usage of dual-sided modules. This particular Hynix memory runs at 7 GHz. We believe that GTX 880 will launch with 4GB memory, later to be accompanied by 8GB models. Either way, this is a major improvement over GTX 780′s 3GB.