any particular reason for intel? personally i think AMD are much better for the gaming scene.
personally you say you want to check if a motherboard supports SLI but bought an ATI card, i think you are looking for crossfire.
if it has 2 pci-e x16 ports then it will support 2 graphics cards, if it mentions sli or crossfire then it will support that. crossfire will only work on a crossfire board (look for an ati chipset), sli on an sli board (look for an nvidea chipset).
also don't get an ide hard disk, get a sata disk, if you can afford it get a sata2 hard disk, that'll require you to get a motherboard that supports it.
i'm just browsing through that list to check compatabilities..
edit: that board has sata2 bt the 2 pci-e slots will only let yuo use the 2 graphics cards to run 4 monitors, no sli or crossfire suppotr that i can see.
this board supports sli for 2 nvidea cards operating together
http://www.newegg.com/Product/Product.asp?Item=N82E16813135225
this supports sata2 gigabit lan etc etc.. it also dosen't say it suppotrs support that cpu though:
http://www.ecs.com.tw/ECSWeb/Products/ProductsDetail.aspx?MenuID=16&LanID=9&DetailID=584&DetailName=CPU%20SupportProcessor Processor info.
(Cache, FSB, Pkg) Status
P4 Extreme Edition 3.73 GHz (2MB,1066 MHz,LGA775) YES
Pentium D 950 3.4 GHz (2x 2MB,800 MHz,LGA775) YES
Pentium D 940 3.2 GHz (2x 2MB,800 MHz,LGA775) YES
Pentium D 920 2.8 GHz (2x 2MB,800 MHz,LGA775) YES
Pentium D 840 3.2 GHz (2x 1MB,800 MHz,LGA775) YES
Pentium D 830 3.0 GHz (2x 1MB,800 MHz,LGA775) YES
Pentium D 820 2.8 GHz (2x 1MB,800 MHz,LGA775) YES
P4 672 3.8 GHz (2MB,800 MHz,LGA775) YES
P4 670 3.8 GHz (2MB,800 MHz,LGA775) YES
P4 660 3.6 GHz (2MB,800 MHz,LGA775) YES
P4 650 3.4 GHz (2MB,800 MHz,LGA775) YES
P4 631 3.0 GHz (2MB,800 MHz,LGA775) YES
P4 571 3.8 GHz (1MB,800 MHz,LGA775) YES
P4 561 3.6 GHz (1MB,800 MHz,LGA775) YES
P4 551 3.4 GHz (1MB,800 MHz,LGA775) YES
P4 550/550J 3.4 GHz (1MB,800 MHz,LGA775) YES
P4 540/540J 3.2 GHz (1MB,800 MHz,LGA775) YES
P4 530/530J 3.0 GHz (1MB,800 MHz,LGA775) YES
P4 520/520J 2.8 GHz (1MB,800 MHz,LGA775) YES
P4 515 2.93 GHz (1MB,533 MHz,LGA775) YES
P4 510 2.8 GHz (1MB,533 MHz,LGA775) YES
P4 505 2.66 GHz (1MB,533 MHz,LGA775) YES
Celeron D 351 3.2 GHz (256KB,533 MHz,LGA775) YES
Celeron D 345J 3.06 GHz (256KB,533 MHz,LGA775) YES
Celeron D 340J 2.93 GHz (256KB,533 MHz,LGA775) YES
Celeron D 335J 2.8 GHz (256KB,533 MHz,LGA775) YES
Celeron D 330J 2.66 GHz (256KB,533 MHz,LGA775) YES
maybe one of them instead?
a jump to AMD would improve the options a lot, especially for crossfire.
eg
http://www.newegg.com/Product/Product.asp?Item=N82E16813154009
http://www.newegg.com/Product/Product.asp?Item=N82E16813131584
or sli
http://www.newegg.com/Product/Product.asp?Item=N82E16813138253
AMD athlon 64 3000+, 1GB ddr400, 400GB total hdd, ati radeon x700pro 256mb (pci-e), onboard nvidea graphics (6100 chipset, sharing 128mb ram) 3x17" tft(@1280x1024).