Why is the MacBook Pro Serial ATA transfer speed half that of the new iMac?

I have a MacBook Pro 2.4 GHz 15.4 inch with a Seagate Momentus 160 GB, 7200 rpm, serial ATA, PRT hard drive. This hard drive has a serial ATA transfer speed rating of 3.0 Gigabits per second. The MBP logic board has an Intel 965 chip set that has a serial transfer speed rating of 3.0 Gigabits per second. I was at the Mac Store the other day and noticed that the new iMac 20 and 24 inch computers (that have the same intel 965 chip set) have an Intel ICH8-MAHCI speed rating of 3.0 Gigabits per second. My question is why does the MacBook and MacBook Pro's only have an Intel ICH8-M AHCI speed rating of 1.5 Gigabits per second? Attached is a copy of my Serial-ATA information:
Intel ICH8-M AHCI:
Vendor: Intel
Product: ICH8-M AHCI
Speed: 1.5 Gigabit
Description: AHCI Version 1.10 Supported
ST9160823AS:
Capacity: 149.05 GB
Model: ST9160823AS
Revision: 3.DAE
Serial Number: 5NK03DBN
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
OS9 Drivers: No
S.M.A.R.T. status: Verified
Volumes:
Macintosh HD:
Capacity: 148.73 GB
Available: 78.21 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s2
Mount Point: /
MacBook Pro 2.4 GHz (MA896LL) W/ 4GB RAM Mac OS X (10.4.10) Seagate ST9160823AS Hard Drive

For several reason although the main one is that the vast majority of 2.5" drives have a 1.5Gbps interfacce. Drives with a 3Gbps interface in this size are rare where as they're very common in the 3.5" drive size which is used in the iMac.
Additionally you'll find that few drives do in fact make use of this larger bandwidth. For instance, the fastest 3.5" SATA drive one can buy for an iMac/Mac Pro up to 500GB is in fact a Western Digital Raptor 150GB which has an SATA I 1.5Gbps interface. So the interface bandwidth isn't everything. Yes there are faster drives than this now but they are in the 750GB size and up.

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    I have subject MBP with a Seagate Momentus 160 GB, 7200 rpm, serial ATA, PRT hard drive. This hard drive has a serial ATA transfer speed rating of 3.0 Gigabits per second. The MBP logic board as an Intel 965 chip set that has a serial transfer speed rating of 3.0 Gigabits per second. I was at the Mac Store today and noticed that the new iMac computer (that has the same chip set) has an Intel ICH8-MAHCI speed rating of 3.0 Gigabits per second. My question is why does the MacBook and MacBook Pro's only have an Intel ICH8-M AHCI speed rating of 1.5 Gigabits per second? Attached is a copy of my Serial-ATA information:
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    Volumes:
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    Writable: Yes
    File System: Journaled HFS+
    BSD Name: disk0s2
    Mount Point: /

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