MPS Revision

[Commandos]

Hi All
System Specs:
2.8C, Asus P4P800SE, 2X512 DDR 400 Kingaton, GF4 FX5600, Sata Seagate, etc......
Was playing Far Cry and went to Bios to increase the AGP Aperture size, just to see if it makes any difference, knowing that I have 1GB of Ram. I noticed something in Advanced chipset section, called MPS revision. There are 2 choices, 1.1 and 1.4. Mine is set to 1.4.
In the mb manual, there isnt any explanation.
Can someone please sight me regarding this point, and does the MPS Revision mean?
Thanks in advance

[MJCfromCT]

Here is what I was able to find:

http://www.rojakpot.com/default.aspx...ar1=0&var2=110

MPS Revision

Common Options : 1.1, 1.4

Quick Review

This feature is only applicable to multiprocessor motherboards as it specifies the version of the Multi-Processor Specification (MPS) that the motherboard will use. The MPS is a specification by which PC manufacturers design and build Intel architecture systems with two or more processors.

MPS 1.1 was the original specification. MPS version 1.4 adds extended configuration tables for improved support of multiple PCI bus configurations and greater expandability in the future. In addition, MPS 1.4 introduces support for a secondary PCI bus without requiring a PCI bridge.

If your operating system comes with support for MPS 1.4, you should change the setting from the default of 1.1 to 1.4. You also need to enable MPS 1.4 support if you need to make use of the secondary PCI bus on a motherboard that doesn't come with a PCI bridge.

You should only leave it as 1.1 only if you are running an older operating system that only supports MPS 1.1.

According to Eugene Tan, Windows NT already supports MPS 1.4. Therefore, newer operating systems like Windows 2000 and Windows XP shouldn't have any problem supporting MPS 1.4.

However, users of the ABIT BP6 motherboard and Windows 2000 should take note of a possible problem with the MPS version set to 1.4. Dan Isaacs reported that when you set the MPS version to 1.4 in the ABIT BP6, Windows 2000 will not use the second processor. So, if you encounter this problem, set the MPS Revision to 1.1.

[Peter M]

MPS 1.4 is required for systems that have multiple PCI bus branches. This is only larger NUMA boxes, ServerWorks chipset gear, and more recently Opterons.

Implementation screwups might appear on this or that side, so while it shouldn't make any difference on systems other than the above, YMMV.

[Commandos]

Thanks Peter M and MJCfromCT for ur replies which made the MPS issue crystal clear.
Cheers