So far, only a handful of smartphones like the Lumia 950 series and Lumia 550 run the Windows 10 Mobile OS, straight out of the box. Even though Microsoft has shared plans to upgrade the existing Lumia handsets to the new OS, the rollout might take some time. But now, an unnamed Windows 10 handset apparently made a visit to the GFXBench benchmark testing site with Qualcomm's latest Snapdragon 820 SoC on board.

According to Nokia Power User, the new device goes by the code name “HP Falcon.” Powered by Windows 10 Mobile and Snapdragon 820, this handset comes with a humongous 5.8-inch display, aided by a QHD resolution of 2,560 x 1,440 pixels.

Lumia-Snapdragon-820 An unnamed Lumia handset running Windows 10 Mobile and powered by Snapdragon 820 spotted at the GFXBench site. Photo: Nokia Power User

Speaking of Snapdragon 820, this chipset follows 64-bit architecture and comes manufactured by the famous 14nm process. It works in tandem with Qualcomm’s Kryo cores and comes equipped with an improved Adreno 530 GPU, which is believed to be 40 percent faster than the current-generation Adreno 430, seen in the Snapdragon 810 SoC, Winbeta reported.

When it comes to camera configuration, the specifications list point to a solid 20-megapixel rear-facing snapper and a very-generous 12-megapixel front-facing shooter for selfies. The device comes backed by a modest 1 GB of RAM and 43 GB of native storage. Readers should however note that benchmark testing sites usually get the RAM and memory configurations wrong. Hence, it goes without saying that, the modest 1 GB RAM could be a mistake.

Even though the codename suggests the handset is HP’s, GSM Arena says, the new device could be a Lumia handset as Microsoft is already rumored to release a device to top the Lumia 950 XL. Notably, the Lumia 950 XL comes powered by a Qualcomm Snapdragon 810 processor, whereas the smaller sibling Lumia 950 utilizes the hexa-core Snapdragon 808 chipset. To top it off, HP has not revealed any such plans for a Windows 10 Mobile powered smartphone.