I found Crysis benchmark tool that allows higher resolutions 😁
Benchmark tool download page (guru3D forum) : LINK

Sadly my fastest cards are not enough to make it run smoothly at highest settings available now...
Crysis @ Very High, DirectX 10 (x86/32bit) @ 8k (7680x4320) + MSAA 8x(Q) :

Result : Avg. ~14.4FPS

Result : Avg. ~20.3FPS

Dual Pentium 3 Coppermine 1Ghz
2Gb PC133 SD-RAM
64Gb Transcend SATA SSD
160Gb HDD
Radeon HD3450 AGP 512Mb DDR2
Ensoniq AudioPCI