Os probes da BIOS e de hardware indicam 8 GB instalados. Slots de chip trocado sem diferença de comportamento. O DMESG E820 mapeia da seguinte forma:
BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
[ 0.000000] BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
[ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000bf9bf000 (usable)
[ 0.000000] BIOS-e820: 00000000bf9bf000 - 00000000bfabf000 (reserved)
[ 0.000000] BIOS-e820: 00000000bfabf000 - 00000000bfbbf000 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000bfbbf000 - 00000000bfbf5000 (ACPI data)
[ 0.000000] BIOS-e820: 00000000bfbf5000 - 00000000bfc00000 (usable)
[ 0.000000] BIOS-e820: 00000000bfc00000 - 00000000e0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000f8000000 - 00000000fc000000 (reserved)
[ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
[ 0.000000] BIOS-e820: 00000000fec10000 - 00000000fec11000 (reserved)
[ 0.000000] BIOS-e820: 00000000fed80000 - 00000000fed81000 (reserved)
[ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
[ 0.000000] BIOS-e820: 00000000ffe00000 - 0000000100000000 (reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 000000011f000000 (usable)
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] DMI 2.7 present.
[ 0.000000] DMI: Hewlett-Packard HP Pavilion g7 Notebook PC/3568, BIOS F.45 01/17/2012
[ 0.000000] e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved)
[ 0.000000] e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
Atualização da BIOS para ver F.52 - sem ajuda. Re-instalado o Windows 7 com os mesmos sintomas. Laptop retornado como slot de memória de sistema ruim 2. Como um aparte, a HP não foi incrivelmente útil e a política de devolução de 90 dias do varejista foi minha melhor opção para resolver o problema com um laptop totalmente novo.