The smallest GPU I've seen so far is the Zotac Twin Edge. It's every so slightly wider than 2 slots, is a bit taller than the IO brackets, and appears to be around 230mm in length.
Next is MSI Ventus 2X. It is as wide as 2 slots, taller than the Zotac, and appears to be about 240mm in length.
Last, we have PNY Verto Dual Fan. 2 slots wide, only as tall as the IO bracket, and exactly 250mm long.
Lets keep updating this thread with new intel as it comes. At present, the 4070 is the most likely update path for many out there.
ZOTAC RTX 4070 Twin Edge Specs
NVIDIA AD104, 2475 MHz, 5888 Cores, 184 TMUs, 64 ROPs, 12288 MB GDDR6X, 1313 MHz, 192 bit
www.techpowerup.com
Next is MSI Ventus 2X. It is as wide as 2 slots, taller than the Zotac, and appears to be about 240mm in length.
MSI RTX 4070 VENTUS 2X OC Specs
NVIDIA AD104, 2505 MHz, 5888 Cores, 184 TMUs, 64 ROPs, 12288 MB GDDR6X, 1313 MHz, 192 bit
www.techpowerup.com
Last, we have PNY Verto Dual Fan. 2 slots wide, only as tall as the IO bracket, and exactly 250mm long.
PNY RTX 4070 VERTO Dual Fan Specs
NVIDIA AD104, 2475 MHz, 5888 Cores, 184 TMUs, 64 ROPs, 12288 MB GDDR6X, 1313 MHz, 192 bit
www.techpowerup.com
Lets keep updating this thread with new intel as it comes. At present, the 4070 is the most likely update path for many out there.