Notebook qualified for Premiere Pro CS4

Hi, I was wondering if this laptop would be equipped to use  Premiere Pro CS4 on,  not so much heavy use. I'll probably get the i7 2620m processor instead assuming it's worth it.
It's a Dell XPS 15
Processor
2nd generation Intel® Core™ i5-2410M processor 2.30 GHz with Turbo Boost 2.0 up to 2.90 GHz
Operating System
http://www.dell.com/mc.ashx?id=Tech-Spec-Formatting:MDA-ToolTip&c=us&l=en&s=dhs&modalwidth =400&modalHeight=150&ovropac=0&modalscroll=yes&modaltarget=div&modaltype=tooltip&position= bottom&title=Genuine&flip=true&eventType=rolloverWindows 7 Home Premium 64-Bit
Display
15.6 in HD WLED TL (1366x768)
memory
4Gb dual Channel  DDR3 SDRAM at 1333MHz
hard drive
500gbSATA hard drive (7200RPM)
video card
NVIDIA GeForce GT 525M 1GB graphics with Optimus
For $100 more the laptop has 6gb ram and NVIDIA GeForce GT 540M 2GB graphics with Optimus... would the difference in running PP CS4 be only marginal, or would it result in extremely worthy improvements?
I use a desktop for editing but want to be able to use a laptop while I'm mobile, so I just want to assure I purchase a notebook that won't crash often or run too slow to bear while using PP.
also wondering if a notebook with a drive that's only 5400 rpm would be acceptable if I'm also using an eSata?
Thank you for your insight in advanced.

I second Harm's and John's recomendations. That XPS 15, as configured as listed above, does not meet Adobe's practical minimum requirements for either CS4 or CS5. In fact, CS4 actually demands far more RAM than it it constrained to use (as a 32-bit program), meaning that it will never perform well regardless of the platform because CS4 relies extremely heavily on the pagefile due to the lack of total RAM support.
And even if you plan to upgrade to CS5.5, that laptop suffers from several limitations:
1) The i5-2410M, like all other mobile i5 CPUs, is only dual-core. And given that no desktop dual-core system performs as well as even a mediocre quad-core system, the dual-core laptops will likely be even slower than most of the desktop dual-core systems.
2) The laptop has only 4GB of RAM. Unfortunately, the XPS 15 (in most configurations) does not support more than 8GB total of RAM. This means that you'd have to max out on the total RAM capacity just for Premiere Pro to even run acceptably well - and then, only if you choose a quad-core i7 (as in i7-2xxxQM).
3) Because mobile hard drives are typically slower-performing than their desktop counterparts, consider an SSD instead as the laptop's system drive. But then, you'd have to put up with only one eSATA port and two USB 3.0 ports to connect an external hard drive.
4) The GeForce GT 525M is barely adequate for CS5.x (if you choose to upgrade Premiere Pro to the latest version): It uses only DDR3 memory (current fast GPUs use (G)DDR5 memory), and it has only 96 CUDA cores. As such, it would be nearly two times slower than a fast mobile GPU.
5) Dell often includes a fair amount of bloatware pre-installed on their systems - and the bloatware seriously degrades system performance. What's more, some of that bloatware cannot be easily uninstalled - and some parts of the bloatware are left on the system to screw up overall system performance even if the main bloatware apps are uninstalled.
Put them all together, and you might very well end up with a system whose overall performance ranking is at or very near the very bottom of the PPBM5 results list on the PPBM5 site. In fact, even if you use CS4 and run PPBM4, your ranking would still be very near the bottom of the PPBM4 results list on the PPBM4 site.

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