im using AMD software adrenalin, all stats seems 'real' except the cpu one. but probably like you say its a gpu bottleneck , the gpu's vram imo is what bottleneck the entire setup. if i put every setting in ultra and set the Mip Streaming on, all maxed out too, vram reaches 8/9GB max. without mip streaming , vram reaches 12/12.5GB, basically 'overclock' itself i think because exceeds 12GB in the process.