Here are some OC settings someone else got for that system.
If you're getting 145fsb then you don't have a TME lock. It looks like the Alienware Area 51 ALX, and Dell XPS 435MT can swap BIOS, but not the XPS 435T/XPS9000. Alienware went with an ASUS P6T for the bigger tower version.
The XPS730x with H2C peltier had some factory overclock settings. It's another MSI MB. Maybe the BIOS modders can splice a BIOS together for you?
MS 7543 is that MB.
It looks like The Studio XPS 435MT (Micro ATX) got an overclocking BIOS through Alienware as the Aurora ALX.
The Full Tower XPS 730X got overclocking when ordered with a Hybrid Peltier cooler H2C, This may also be an Alienware Area 51-ALX I7 with a water loop.
The XPS435T/ XPS 9000 got left out due to Alienware using an ASUS MB for the midtower systems. I think it's an MSI MB like the other 2 Dell X58 XPS systems.
Last edited by Retrorockit; 05-29-2019 at 10:36 AM.