I dont have the AHCI option in BIOS nor do I have an HPET 64-bit mode option How ca n i find that option to enable hpet 64 bit mode ?

If the BIOS supports it, the option is usually available in the advanced options area. Each BIOS is slightly different. Be advised, however that switching the mode from IDE to AHCI will result in Windows not booting if already installed. The two modes are not compatible. Using AHCI will result in needing to reload the OS. Also ensure that you backup all data on the disk as well to prevent data loss.

Download the BIOS version below will enable you to have the options of enable/disable the hotkey.
BIOS for Windows 7 (32-bit, 64-bit), Windows 8 (32-bit, 64-bit), Windows 8.1 (32-bit, 64-bit). Do not power off or restart your computer during the BIOS flashing process, which will cause serious damage and improper functioning of your computer.Please click the follwowing:
- BIOS Update for - Lenovo G400s, G500s - version 2.02

Hi, you can see the list here:

http://www.asus.com/Motherboards/AMD_AM2Plus/M2N68AM/#specifications

At this site you also find drivers.
Remember to select your operating system

AMD Socket AM2+ / AM2 Processors
for AMD Phenom™ FX / Phenom / Athlon™ / Sempron™
AMD Cool 'n' Quiet™ Technology
AMD64 architecture enables simultaneous 32-bit and 64-bit computing
Support 45nm Phenom™ II CPU Chipset NVIDIA Geforce 7025/nForce 630a
System Bus 2000/1600 MT/s Memory 2 x240-pin DIMM, Max. 4 GB, DDR2 1066/800/667/533 ECC,Non-ECC,Un-buffered Memory
Dual Channel memory architecture
*DDR2 1066 is supported by AM2+ CPU only Expansion Slots 1 x PCIe x16
1 x PCIe x1
2 x PCI
Storage Southbridge
4 xSATA 3 Gb/s ports Support RAID 0,1,5,10,JBOD

ATAPI support ,AHCI mode
LAN RTL8211CL Phy Gigabit LAN Audio ALC662 High Definition Audio 6 -Channel CODEC
USB 10 USB 2.0 ports (4 on back I/O, 6 on board)
AMD Socket AM2+ / AM2 Processors
for AMD Phenom™ FX / Phenom / Athlon™ / Sempron™
AMD Cool 'n' Quiet™ Technology
AMD64 architecture enables simultaneous 32-bit and 64-bit computing
Support 45nm Phenom™ II CPU Chipset NVIDIA Geforce 7025/nForce 630a
System Bus 2000/1600 MT/s Memory 2 x240-pin DIMM, Max. 4 GB, DDR2 1066/800/667/533 ECC,Non-ECC,Un-buffered Memory
Dual Channel memory architecture
*DDR2 1066 is supported by AM2+ CPU only Expansion Slots 1 x PCIe x16
1 x PCIe x1
2 x PCI
Storage Southbridge
4 xSATA 3 Gb/s ports Support RAID 0,1,5,10,JBOD

ATAPI support ,AHCI mode
LAN RTL8211CL Phy Gigabit LAN Audio ALC662 High Definition Audio 6 -Channel CODEC
USB 10 USB 2.0 ports (4 on back I/O, 6 on board)
AMD Socket AM2+ / AM2 Processors
for AMD Phenom™ FX / Phenom / Athlon™ / Sempron™
AMD Cool 'n' Quiet™ Technology
AMD64 architecture enables simultaneous 32-bit and 64-bit computing
Support 45nm Phenom™ II CPU Chipset NVIDIA Geforce 7025/nForce 630a
System Bus 2000/1600 MT/s Memory 2 x240-pin DIMM, Max. 4 GB, DDR2 1066/800/667/533 ECC,Non-ECC,Un-buffered Memory
Dual Channel memory architecture
*DDR2 1066 is supported by AM2+ CPU only Expansion Slots 1 x PCIe x16
1 x PCIe x1
2 x PCI
Storage Southbridge
4 xSATA 3 Gb/s ports Support RAID 0,1,5,10,JBOD

ATAPI support ,AHCI mode
LAN RTL8211CL Phy Gigabit LAN Audio ALC662 High Definition Audio 6 -Channel CODEC
USB 10 USB 2.0 ports (4 on back I/O, 6 on board)
2 x240-pin DIMM, Max. 4 GB, DDR2 1066/800/667/533 ECC,Non-ECC,Un-buffered Memory
Dual Channel memory architecture
*DDR2 1066 is supported by AM2+ CPU only

1 x PCI-E x16 Graphic card slot.

At this point i would ask what model is the hard drive and is it internal or external..?

The AHCI can be enabled from using the correct driver but you should have enabled it PRIOR to the OS install

Acer did not always do this but often relied on compatibility mode

The speed increase is often not that much.

The BIOS on that board can be updated but you may find that AHCI still does not work as you expect.

yes

I already explained in the other post ..The action required is either install a 3rd party raid and ahci driver ..and if you do not have the possibility ..just c\go to bios and enable the hard disk bus to work as ide..(disable ahci mode) I'm not sure how it will appear ..but you have to look under the bus mode..where the hard disk is seen ..It will appear as ahci enabled..and need to be disabled or ..will have raid mode enabled..and need to set it as native ..or ide compatible

If you would like to make use of the SATA controller's AHCI features, you should enable this BIOS feature. But please note that enabling this feature requires you to load the SATA controller driver during the Windows XP installation routine.
If you do not intend to use the AHCI features, it's recommended that you disable this BIOS feature. This allows you to use the native Windows XP driver. You won't need to load the SATA controller driver during the Windows XP installation routine.

Read more: http://www.techmetica.com/howto/sata-ahci-mode-bios-setting.-what-does-it-do/#ixzz0y5ObAtN8

see that the sata mode is in ide there are 2 options ahci and ide select ide and go for it

this is'nt so easy here an example solution:

Enabling SATA mode to AHCI after XP Install (applicable to most laptops, or systems) If you want to enable SATA mode as AHCI after installing Windows XP, then read on. It's a bit of a long read because of step-by-step instructions, but worth it.

I did this on on Acer Aspire 5315-2153, it seems like the basic strategy should work on other laptops or systems.

For whatever reason, you may have installed Windows XP on your new laptops with SATA Native Mode disabled in the BIOS. Once XP is installed, enabling it in the BIOS will result in a BSOD upon loading Windows because XP doesn't have the correct drivers.

I read that enabling SATA native mode will give you a slight performance inrease and slightly increased battery life, so it seems worthwhile to me

Here's how I did it on a Acer Aspire 5315-2153 running Windows XP (32 Bit version):

- Download the Intel Matrix Storage Manager software from Intel (I think it's iata_enu.exe)or AHCI_Intel_v7.5.0.1017_XP.zip from Acer web site.

- Extract files from AHCI_Intel_v7.5.0.1017_XP.zip to e.g. C:\AHCI_Intel_v7_5_0_1017_XP files need: (you may delete the rest)

iaahci.cat
iaahci.inf
iastor.cat
iastor.inf
iastor.sys
TXTSSETUP.OEM

- Now go to Device Manager, under IDE ATA/ATAPI controllers you should

see: Intel 82801HEM/HBM SATA AHCI Storage Controller

- Right-Click on that and select Update Driver
- Say no to connecting to Windows Update to search, hit Next
- Select Install fro a list or specific location (Advanced), hit Next
- Select "Don't search. I will choose the driver to install", hit Next
- Select Have Disk
- Browse to C:\AHCI_Intel_v7_5_0_1017_XP and highlight the iastor.inf file, hit Open
- Select OK
- Now you should have a list of controllers, for the Acer 5315-2153 choose Intel 82801HEM/HBM SATA AHCI Storage Controller, hit Next
- You'll get warned that installing the device driver is not recommended, click Yes to continue installing
- Click Finish
- Click Yes to restart your computer

When your computer boots up, you need to hit F2 to enter the BIOS. Change SATA mode to AHCI, save changes and exit.

After you log into Windows, your computer will find the "new" hardware. Wait until you get the popup message to restart your computer, say Yes to restart one last time.

You may download also from Intel the RAID/AHCI Software - Intel® Matrix Storage Manager (iata70_enu.exe 5640KB) and install it in your system, it may fix in case you got the wrong Intel 82801 AHCI controller.

I give credit to Jamie Rybarczyk at HP Business Support Center forum for doing most of typing.

http://forum.notebookreview.com/showthread.php?t=186471