Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

On Asus P5B Deluxe/Commando when you tip over 400FSB to 401+ FSB there’s a strap change causing a massive reduction in system memory bandwidth and performance / latency. In the past to keep decent performance on Asus P5B Deluxe/Commando above 401FSB, we booted into windows at 400FSB and clockgen/setfsb our way up past 400FSB. This method required alot more vMCH (northbridge) voltage. For example, for my Asus Commando to hit 400FSB setfsb/clockgen up to 470FSB I needed bios set 1.75v vMCH voltage.

Here’s where JP’s Pmem strap tweaks saved the day!  A few hints have been thrown around on Xtremesystems.org forums about tweaking the NB Strap settings even further within windows on the fly. Most of them refer back to jp’s thread over at http://www.ixtremtek.com/forums/showthread.php?t=76 where he outlines the tweaks for Asus P5B Deluxe which from my own tests are spot on for Asus Commando as well

There’s 2 sets of tweaks, the original tweaks (32bit) for when you tip over the 400FSB strap change line to 401+ FSB. Then jp found some other tweaks (8bit) for at high FSB i.e. 500FSB marks. Both sets of tweaks require the use of an awesome little application called PMem.

These tweaks also can help the Biostar P45 chipset and other motherboards tighten their latencies and improve performance.  Read full guide can be read here.

before‘s own findings are here.

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