https://cmp.wiki/w/index.php?action=history&feed=atom&title=ASUS_P9X79_WS 2026-10-31T10:12:29Z Revision history for this page on the wiki MediaWiki 1.43.11 https://cmp.wiki/w/index.php?title=ASUS_P9X79_WS&diff=148&oldid=prev 2026-10-30T08:03:48Z

<p>Unlocking a CMP 170HX on an ASUS P9X79 WS (MMIOH window), from Discord (Fernando Delfini, GlobalApathy); sources: @fdelfini, @globalapathy</p> <p><b>New page</b></p><div>{{Platform<br /> |board=ASUS P9X79 WS<br /> |cpu=Intel LGA2011 (X79)<br /> |bios_version=<br /> |settings=Above 4G Decoding available in the BIOS; the 64-bit MMIO (MMIOH) window was too small until kernel parameters were changed (exact parameters not posted)<br /> |gen2_result=<br /> |rebar_result=Unlock works after the MMIOH change; BAR1 size not reported<br /> |p2p_result=<br /> |os_driver=Ubuntu (version not given)<br /> |virtualization=Bare metal<br /> |cards=<br /> |status=Reported<br /> |tested_by=fdelfini<br /> |source=https://discord.com/channels/1518634379604136178/1518692084729511967/1561810276351741975<br /> }}<br /> <br /> Fernando Delfini could not unlock a card on his X79 WS board at first and asked whether the platform&#039;s MMIO limits were the cause. {{Source|handle=fdelfini|date=2026-10-19|link=https://discord.com/channels/1518634379604136178/1518692084729511967/1561803051667554325}}<br /> <br /> == What was suggested ==<br /> GlobalApathy guessed Above 4G Decoding and Resizable BAR might be missing or hidden on that BIOS. His AI assistant&#039;s explanation: the P9X79 WS BIOS allocates a small window (typically 2 to 16 GB) for 64-bit devices above 4 GB, so a 64 GB BAR request fails, and the hidden MMIOH Base and Size would need a BIOS edit with AMIBCP 4.55 rather than a &lt;code&gt;&lt;nowiki&gt;setup_var&lt;/nowiki&gt;&lt;/code&gt; toggle. {{Status|Theory}} {{Source|handle=globalapathy|date=2026-10-19|link=https://discord.com/channels/1518634379604136178/1518692084729511967/1561805422950875147}}&lt;br /&gt;{{Source|handle=globalapathy|date=2026-10-19|link=https://discord.com/channels/1518634379604136178/1518692084729511967/1561806012179288205}} <br /> <br /> == What worked ==<br /> Fernando&#039;s board already had Above 4G Decoding. His assistant &quot;changed some ubuntu parameters and unlocked mmioh size&quot;, and it then worked. {{Source|handle=fdelfini|date=2026-10-19|link=https://discord.com/channels/1518634379604136178/1518692084729511967/1561805906688213083}}&lt;br /&gt;{{Source|handle=fdelfini|date=2026-10-19|link=https://discord.com/channels/1518634379604136178/1518692084729511967/1561810276351741975}} The exact kernel parameters were not posted; &lt;code&gt;&lt;nowiki&gt;pci=realloc&lt;/nowiki&gt;&lt;/code&gt; is the usual candidate (see [[Server BIOS setup]] case C). If you get this board working, post the parameters.<br /> <br /> == Related ==<br /> [[Platforms]], [[Consumer motherboards]], [[Server BIOS setup]], [[Card not detected or BAR allocation fails]].<br /> <br /> {{ImportFooter}}</div>

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