I have an 131-GT-E767 x58 motherboard with a recently acquired Xeon x5675. I'm able to overclock it and run prime95 in Windows, however, the highest CPU multiplier the BIOS allows me to set is 23x -- I'm finding many others online who are able to set their multipliers up through 25x -- and set directly, not roundabout through turbo boost.
 
The highest the BIOS allows me to set is 23x. If I enable turbo boost, the subtext shows me that a 24x multiplier will be used for turbo, but I'm not able to set this number directly myself, and I'd obviously have to have turbo boost enabled. But I'm really trying to get a 25x multiplier like I've seen many others do.
 
I'm currently on the latest BIOS (83). Does this require a Westmere mod of the motherboard? The motherboard boots fine without it, displaying the "Xeon 3.07GHz" properly, so I assumed that meant I didn't need to do the mod. I can, though, if it'll fix this.
 
Thanks

bill1024
I have had a few EVGA x58 boards and ran the xeon x5660 CPU, that is how they all worked. 
With the x5660 on an EVGA FTW3 or Classifies3  I was able to set it to 21x and it would run at 23x like your is doing (your 23 and 25)
I had two Asus boards, they let me set it right to 23 like you want to do.
That is just how EVGA did it and how their BIOS works.

Yikes, I didn't get a notification for this response, apologies on the delay. Thanks for the info.
 
I wonder if it'd be possible to modify the BIOS firmware to "forcibly" allow (unlock) the 25x multiplier? What if I were to modify the hex and allow the possibility of setting a 25x multiplier -- would that work?