FSB downclock mod on the intel GL960 and GL40 --- useful info for PLL Modders

Introduction:
This thread explains a BSEL Mod that will allow a latest generation of Core 2 Duo processor such as the T9900 to work in a laptop equipped with an old chipset such as the Intel GL960. The mod forces the latest generation of Core 2 Duo to operate with an FSB of 800MHz (4 x 200MHz) instead of its native 1066MHz (4 x 266MHz). Applying the PLL mod as explained by moral hazard here after applying the BSEL Mod should allow re-increasing the FSB back to 1066MHz.

How is this useful:
1- The CPU will not lock at its lowest multiplier (i.e. x6).
2- This would help turn a latest generation Core 2 Duo CPU into a ULV. For instance, my T9900 was running at 2.29GHz after mod instead of the stock 3.06GHz. The T9900 was stable with a Vcore of 1.1v and the maximum temperature under orthos was between 55c and 60c.
3- Run the latest generation of Core 2 Duo at native speed or close to their native speed with a chipset that is not designed to support them.

Chipset concerned by the mod:
- Intel GL960, GM965, PM965, or GL40.
- non Intel chipsets that support FSB 800MHz.

CPU concerned by the mod:
- P7350, P7370, P7450, P7550, P7570.
- P4800, P8600, P8700, P8800.
- P9500, P9600, P9700.
- T9400, T9600, T9700, T9800, T9900.
- Q9000, Q9100.
- X9100, QX9300.

Requirements:
1- One of the above chipsets.
2- One of the above CPUs.
3- A BIOS that supports the latest generation of Core 2 Duo processors.

Testing the BIOS:
The cheapest way I know of to test the BIOS is to install a Pentium Dual Core T4*00 series or a Core 2 Duo T6*00 CPU in your laptop. The T4200 is cheap and can be bought from ebay for about £15. A BIOS that supports the above CPUs will not make your laptop freeze or refuse to boot into Windows. Thus, if your laptop freezes with the T4200 this means that your BIOS doesn't have the necessary code to detect and manage the latest generation of Core 2 Duo.

Origin of this thread:
nando4 contacted me regarding a reply I received a while ago from one of the NBR members. I don't remember who it was from so if you are this person PM me and I'll credit you. Without going into detail this member pointed out to the fact that a CPU will not lock at multiplier x6 if the BSEL Mod is applied to decrease the FSB on a laptop with an Intel chipset. You can read more about the BSEL Mod here. This means that a Core Duo or Core 2 Duo won't lock at multiplier x6 if the FSB is decreased from 800MHz -> 667MHz, 800MHz -> 533MHz, or 667MHz -> 533MHz. With an Intel chipset, the CPU will lock at multiplier x6 only when the BSEL Mod is applied to increase the FSB.

nando4 thinks lowering the FSB or forcing an FSB of 800MHz is useful as this would help operating the latest Core 2 Duo at their native or near their native speed with the help of the PLL Modon laptops with older chipsets. He suggested that this could be very helpful for the owners of the HDX9000 for instance. The above mod + the PLL mod might enable them to install the X9100, Q9000, Q9100 and QX9300 processors in their laptops.

The mod from FSB 1066MHz (4 x 266) to 800MHz (4 x 200):

List of laptops that have been successfully modded:
Acer Aspire 4315: Chipset Intel GL960 - modded by naton with a T9900, FSB from 1066 -> 800MHz.
Packard Bell Easy Note bg45-u-300: Chipset Intel GM965 - modded by rannyfash with a P7350, FSB from 1066 -> 800MHz.
Aspire Aspire 5720g: Chipset Intel GM965 - modded by niffcreature with a P7350, FSB from 1066 -> 800MHz.
Dell XPS M1530: Chipset Intel PM965 - Modded by niffcreature with a P7350, FSB 1066 -> 800MHz.
HP HDX 9000 Dragon: Chipset Intel PM965 - Modded by no-tech with an X9100, FSB from 1066 -> 800MHz, followed by overclock to 4.2GHz with ThrottleStop. You can read about it here.
Asus M50Sa: Chipset Intel PM965 - Modded by kaza with a P7350, FSB 1066 -> 800MHz.
Asus M50Sa: Chipset Intel PM965 - Modded by kaza with a X9100, FSB 1066 -> 800MHz, then overclocked to 3.5GHz.
Acer Aspire 5920G: Chipset Intel PM965 - Modded by triturbo with a X9100, FSB 1066 -> 800MHz, then overclocked to 3.6GHz.
Dell Latitude D830: Chipset Intel PM965 - Modded by trinsic nz with a X9100, FSB 1066 -> 800MHz, then overclocked to 3GHz.
Compaq CQ61-421SA: Chipset Intel GL40 - Modded by radtw78 with a P8700, FSB 1066 -> 800MHz.
CSony Vaio SZ7: Chipset Intel PM965 - Modded by treffmeister with a P8700, FSB 1066 -> 800MHz.
Acer Aspire 5920G: Chipset Intel PM965 - Modded by ergoon with a X9100, FSB 1066, FSB 1066 -> 800MHz, then overclocked to 3.2GHz.
Toshiba Satellite L305: Chipset Intel GL40 - Modded by Formula with a T9550 and E8135, FSB 1066 -> 800MHz.

List of laptops that failed to mod:
Toshiba Equium L40: tested by naton with a T4200. The laptop froze at the BIOS splash screen. This indicates that the BIOS doesn't support the latest generation of Core 2 Duo.

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FSB downclock mod on the intel GL960 and GL40 --- useful info for PLL Modders