New Desktop

OK, I have efficiently decreased the price to $566.94.
However, this is my latest dilemma:
The technician from my dad's office says I can't use this set of RAM:
Corsair XMS3 6GB (3X2GB)
With this motherboard:
ASUS M4N7TD AM3 motherboard

And told me to go and check a list he sent me of compatible RAMs; to my surprise, this very set of RAM was on the list. Here is my problem: Is it wrong to use a Triple-Channel kit with a Quad-channel motherboard?
EDIT: Ah, I already changed the piece... Anyways, this is the final list of components:

ASUS M4N75TD AM3 NVIDIA nForce 750a SLI ATX AMD Motherboard:
$99.99
AMD Phenom II X4 925 Deneb 2.8GHz Socket AM3 95W Quad-Core Processor HDX925WFGIBOX:
$129.99
Western Digital Caviar Blue WD10EALS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive:
$69.99
MSI N465GTX-M2D1G GeForce GTX 465 (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card:
$179.99
SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA CD/DVD Burner - OEM:
$17.99
G.SKILL ECO Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-4GBECO:
$47.99 X 2

Total= $593.93