Are laptop CPUs slower than Desktop Mhz for Mhz?

[Have Blue]

Hi,

I have just been offered a new computer at work. However they have given us a choice of either a laptop or a desktop.

The laptop comes with an Intel Core 2 Duo T7250 (2.0GHz/2MB/800MHz) with Intel GMA X3100

The desktop comes with an Intel Core 2 Duo E4500 (2.20Ghz/2MB/800MHz)

Apart from the obvious 200MHz difference from the start i'm sure someone once told me that laptop processors were slower than a desktop processor with the same MHz. Is this correct?

Basically I would like the laptop but if it is noticeably slower than the desktop I can ask for a CPU upgrade.

 

[Have Blue]

These are the possible upgrades apparently. Bear in mind I cannot really ask for something that is too much faster than the desktop version!

Intel Core 2 Duo T7250 (2.0GHz/2MB/800MHz) with Intel GMA X3100
Intel Core 2 Duo T7500 (2.2GHz/4MB/800MHz) with Intel GMA X3100
Intel Core 2 Duo T9300 (2.5GHz/6MB/800MHz) with Intel GMA X3100
Intel Core 2 Duo T9500 (2.6GHz/6MB/800MHz) with Intel GMA X3100
Intel Core 2 Duo T7250 (2.0GHz/2MB/800MHz) with nVidia Quadro NVS 135M
Intel Core 2 Duo T7500 (2.2GHz/4MB/800MHz) with nVidia Quadro NVS 135M
Intel Core 2 Duo T9300 (2.5GHz/6MB/800MHz) with nVidia Quadro NVS 135M
Intel Core 2 Duo T9500 (2.6GHz/6MB/800MHz) with nVidia Quadro NVS 135M
Intel Core 2 Duo T8100 (2.1GHz/3MB/800MHz) with Intel GMA X3100
Intel Core 2 Duo T8300 (2.4GHz/3MB/800MHz) with Intel GMA X3100
Intel Core 2 Duo T8100 (2.1GHz/3MB/800MHz) with nVidia Quadro NVS 135M
Intel Core 2 Duo T8300 (2.4GHz/3MB/800MHz) with nVidia Quadro NVS 135M

 

[Have Blue]

We will be using the computers for SQL server administration (not running the SQL server on the pc) including handling some very large files (millions of rows). Also we will be creating applications using Visual Studio, so there will be times when the CPU is stressed hence why I wanted to make sure the laptop was at least on a par with the desktop they are offering us.

 

[Have Blue]

if you can;
Intel Core 2 Duo T9500 (2.6GHz/6MB/800MHz) with nVidia Quadro NVS 135M

Yeah ideally I want the best I can possibly get, however I somehow need to justify it over the standard laptop spec they are offering.

 

[Have Blue]

We have the option to upgrade the HD to 7200rpm in place of the standard 5400rpm drive so this should sort the drive speed issue (won't let us stretch to SSD though!)

 

[Have Blue]

Those of us who choose a laptop will have the option to work from home a couple days each week so that is a major driver to wanting the laptop, but still having the same functionality as hte desktop they were offering us.

The FSB is 800mhz apparently compared to the desktop 1300mhz I think.