parameter & speed assistance

[MrDuckGoblin]

Hello, 
I have two rigs that are having the exact same speed issue, so I am sure that I am doing something wrong. I've read through other posts on this forum to try to troubleshoot. I apologize if I missed a fix in a different thread. 

Hardware: 

• Each GPU has at least x8 PCIe lanes. 
  
• Each GPU has at least 2 CPU cores. (CPU utilization is at around 10%)
  
• RAM is equal to GPU memory + 8GB for system @ 3200
  
• SSD hard drive (not NVME)
  
• Delta fans running at full tilt for intake & exhaust 
  
• rig #1 three 2080Ti (blower)
  
• rig #2 three 2080 super (blower)
  
• Gigabit networking
  
• 1300-watt PSU running on 220v. Each GPU has a dedicated 8-pin connections; no pigtail connections.
  

Software: 

• rig #1 Fedora desktop 
  
• rig #2 Ubuntu desktop
  
• Both are pulling down tasks from a Hashtopolis server. 
  
• hashcat v6.2.6
  
• Nvidia driver 550.54.14
  
• Nvidia cuda 12.4
  

Attack:

• -a 3 using pathwell masks (e.g., ?u?l?l?l?l?l?l?l?l?l?d?d, ?u?l?l?l?l?l?s?d?d?d?d,...)
  
• extra parameters "-O -w 4 --hwmon-temp-abort 90"
  
• usually cracking faster hash types: MD5 or NTLM
  

Issue: 
Each of my GPUs is running at ~20Gh/s for both MD5 and NTLM. There is no difference in speed between the 2080ti and the 2080 Super. The GPU temps are about 75*C. Using nvidia-smi, I've noticed that each GPU's usage is 99%, and its memory usage is around 3200 MiB. 

Based on the above, what do you think could be wrong? The masks I use are large, and I think that would be enough work for faster hash types. When I do a benchmark on the local machine, I get the same speeds. So, I don't think it is an issue with the Hashtopolis server; maybe I need to increase the chunk size. 


Thank you in advance