C771US (C700 Series) Maximum Memory

If I install 4GB of ram in this laptop (I know HP doesn’t support it), the memory will test ok in the BIOS but Vista x86 will blue screen with PFN_LIST_CORRUPT. If I reduce the memory to 3GB (1 GB in slot closest to MB and 2GB in the other bank), Vista will run stable. Happens with G-Skill F2-5300CL4D-4GBSQ or Kingston KHX5300S2LLK2/4GR RAM.
I've tested this with BIOS versions F.34 (Current) and F.33. It would be nice if HP Compaq would update the Insyde BIOS to correct this issue.
I know that only 2.8-3.3 GB of memory is available for use by a 32-bit OS. A 32 bit OS has 4GB of address space available. Approx .7 - 1.2 GB of addresses are used for other hardware thereby leaving around 2.8 - 3.3 GB of addresses available for main memory. 64 bit OS would make all 4GB of RAM available to the OS though. I’m going to test the system with 4GB of RAM and Vista x64 this weekend to see if it blue screens as well.
Regards,
Tom
Message Edited by ThomasWilson on 11-18-2008 07:59 PM

After further testing, I found that the 32-bit and 64-bit versions of Vista and Unbuntu 8.10 will not run on this model notebook if 4GB of RAM is installed. Vista blue screens with a PFN_LIST_CORRUPT message, the 64 bit version of Ubuntu crashes with an ACPI error and the 32-bit version of Ubuntu crashes with a large list of problems.
I have tested all of this memory with Memtest86 and have found zero errors. As such, I believe this limitation to be a result of a BIOS bug or a poor memory timing/voltage configuration setting in the BIOS that is not accessible to the consumer.
All of the operating systems will run if 3GB is installed (1GB in the slot closest to the mainboard and 2GB in the other slot - Note: OS will crash if 2GB is in slot closest to Mainboard). I have three of these notebooks each having 3GB of ram that run rock solid stable. I am using Kingston Hyper-X KHX5300S2LLK2 DIMMs.
While I understand that HP officially only supports running this notebook with 2GB of RAM and as such is under no obligation to address this issue, it would be nice if their engineers would fix it in a future update of the BIOS.
If your running a 32-bit OS, 3GB is close to maximum amount of memory that the OS can use (any thing more is a waste). However, a 64-bit OS can take full advantage of all 4GB.
Regards,
Tom

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R_Lange wrote:
What is the maximum memory capability of the HP Pavilion 15-p210na laptop?
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C771US (C700 Series) Maximum Memory

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