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post #14654 of (permalink) Old 05-26-2019, 06:54 AM
Retrorockit
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Quote: Originally Posted by Almost Heathen View Post
unclewebb helped me make sense of overclocking with MSRs and I was able to make a script for it, which is posted on TPU here: https://www.techpowerup.com/forums/t...235975/page-27. MSR documentation for (all?) CPUs is here: https://software.intel.com/sites/def...abcd-3abcd.pdf . Finally got the CPU overclocked in Linux and doing a 24hr stress test with 80% RAM.




That makes sense, maybe the PLL isn't supported. I noticed the FSB did go up, but it seems strange that it hard locked with only ~+7 with or without an HDD attached. I'm glad the OS was on a flashdrive, I had no idea there was a virus warning. Thanks for pointing that out (+rep).



No ECC option unfortunately. I'll have a look at RW Everything and the link you provided, thank you.
The +7 overclock is just about what I get with setFSB on my Optiplex 380 X5470. It's such a barebone office computer there's no extra PCIe slot to try an SATA work around. While you're at the Notebook site you might check out the TME unlock method. My programming skills =0 so my understanding is very limited. But the PLL can have a hex bit
set at boot that puts a hard limit on FSB speed. Since X58 CPUs all run the same BCLK there might be a default setting that's been applied. To avoid spoofing with a resistor it then outputs a 33Mhz PCI frequency. I think the edit tool in SetFSB might be able to access this and change it. BIOSmods.com does do some work with Dell BIOS. I haven't heard any mention of TME unlock there though. iIf you can get the datasheet for your PLL you can locate the pin involved. That's far as I got with it. The BIOS modders might be able to do this if you could tell them what you want done.
This was used by Dell in LGA775 to lock the 65nm to 266fsb, 45 nm to 333fsb, and only the high end dual Xeon workstations got 400fsb CPU support. This defeated the pinmodding overclocks back then. They may still be using it.
It might be interesting to lower the fsb and add another multiplier or 2 just to see how much control SetFSB actually has available.

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Last edited by Retrorockit; 05-26-2019 at 07:19 AM.
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