The 4070 Ti's length of 337 mm exceeds the Thermaltake 100's GPU compatibility of up to 330 mm. While it's a close fit, there may be some potential solutions:
Check for additional space within the case, as sometimes there's a bit of flexibility in accommodating slightly longer GPUs.
Explore vertical GPU mounting options if your case supports them, as this can create extra room.
Consider removing or modifying non-essential components or drive bays that may obstruct the GPU.
Consult the manufacturer's support or user forums for specific experiences with the 4090 or similar GPUs in the same case model.
Keep in mind that while some users may have successfully fit longer GPUs, it's essential to ensure proper airflow and safety when making adjustments