Been running the demo for Supreme Commander for two weeks, the 5750 runs fine, gets a little warmer, the video stays up.
[1] Area-51® m5750Processor: Intel® Core™ 2 Duo Processor T7600 2.33GHz 4MB Cache 667MHz FSB
Operating System (Office software not included):
Genuine Windows® XP Professional with Service Pack 2
Display: Alienware® m5750 17" WideUXGA 1920 x 1200 LCD - Saucer Silver
Motherboard: Alienware® Intel® 945PM + ICH7 Chipset
Memory: 2GB Dual Channel DDR2 SO-DIMM at 667MHz - 2 x 1024MB
System Drive: Extreme Performance (RAID 0) - 160GB (80GB x 2) Serial ATA 1.5Gb/s 7,200 RPM w/ NCQ & 8MB Cache
Primary CD ROM/DVD ROM: 8X Dual Layer DVD+/-RW / 24X CD-RW Combo w/Software
Video/Graphics Card: 256MB ATI Mobility™ Radeon® X1800
Sound Card: Intel® 7.1 High-Definition Audio
Wireless Network Card: Internal Intel® PRO Wireless 3945 a/b/g Mini-Card
Communications: Integrated 10/1000Mb Gigabit Ethernet & 56K V.92 Modem
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UPDATE
Just got the full game yesterday 2/23, haven't put it on the lappy yet, running on my tower which is a:
P4 3.4Mhz
1.5 MB RAM
NVIDIA GeForce 7600 GS (512MB RAM)
Windows XP Pro
I would expect it to run poorer on this maching that on the Alienware because of the difference between the P4 and the Core2Duo
It seems to run well even when there are lots of units made.
I don't think you going to have a problem