Question about ASUS P4P800 SE (890552603657) Motherboard
Hi guys, I have 4 times 1gb ram but the bios only see 3Gb and the system boots very slow. Is there anything I have to set in the bios?
If you are running 32-bit Windows, you must live with it. You will not ever see all 4GB of RAM you've paid for.
If you are running 64-bit Windows, you may have to live with it. Depending on your motherboard's chipset, your system may support memory remapping. If so, you will be able to use all 4GB of RAM.
Due to an architectural decision made long ago, if you have 4GB of physical RAM installed, Windows is only able to report a portion of the physical 4GB of RAM (ranges from ~2.75GB to 3.5GB depending on the devices installed, motherboard's chipset & BIOS). This behavior is due to "memory mapped IO reservations". Those reservations overlay the physical address space and mask out those physical addresses so that they cannot be used for working memory. This is independent of the OS running on the machine. Significant chunks of address space below 4GB (the highest address accessible via 32-bit) get reserved for use by system hardware: • BIOS – including ACPI and legacy video support • PCI bus including bridges etc. • PCI Express support will reserve at least 256MB, up to 768MB depending on graphics card installed memory
What this means is a typical system may see between ~256MB and 1GB of address space below 4GB reserved for hardware use that the OS cannot access. Intel chipset specs are pretty good at explaining what address ranges gets reserved by default and in some cases call out that 1.5GB is always reserved and thus inaccessible to Windows.
Posted on Feb 13, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Feb 20, 2013 | Microsoft Windows XP Professional
Oct 08, 2012 | Intel DG43NB Motherboard
May 02, 2009 | Asrock P4S61 Motherboard
Mar 25, 2009 | Computers & Internet
Dec 07, 2008 | ASUS A8N-E Motherboard
Nov 28, 2008 | Computers & Internet
Jun 03, 2008 | MSI K8N Neo4-F Motherboard
Dec 27, 2007 | Toshiba Satellite A105 Notebook
Nov 25, 2007 | Acer Aspire™ T180 PC Desktop
Jan 28, 2011 | ASUS P4P800 SE (890552603657) Motherboard
360 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: