It is one of the earlier socket 775 server motherboards, it looks like the latest you can get away with is a few of the Dual Core Pentiums - see below.
On another note, I have built a few with similar chipset and did manage to get away with the first generation Core 2 via a third party BIOS upgrade, but I could swear it did not perform as well as it should and I would not recommend anyone to proceed down the same route.
Click here for the official supported list -
P4-505/505J (2.66 GHz) (533 FSB)(E0,D0)
P4-506 (2.66 GHz) (533 FSB, EM64T)(E0,D0)
P4-506 (2.66 GHz) (533 FSB, EM64T, revG1)
P4-515 (2.93 GHz) (533 FSB)(E0,D0)
P4-516 (2.93 GHz) (533 FSB, EM64T)(D0,E0)
P4-516 (2.93 GHz) (533 FSB, EM64T, revG1)
P4-520/520J (2.8E GHz) (800 FSB) (D0)
P4-521 (2.8GHz, 800 FSB,HT, L2 1MB)(D0,E0)
P4-530/530J (3E GHz) (800 FSB) (D0,E0)
P4-531 (3GHz, 800 FSB, L2 1MB)(D0,E0)
P4-540/540J (3.2E GHz) (800 FSB) (E0,D0)
P4-541 (3.2GHz, 800 FSB, L2 1MB)(E0,D0)
P4-550/550J (3.4E GHz) (800 FSB) (D0.E0)
P4-551 (3.4GHz, 800 FSB, L2 1MB,D0,E0)
P4-560/560J (3.6 GHz) (800 FSB) (DO,E0)
P4-561 (3.6GHz, 800 FSB, L2 1MB)
P4-570J (3.8 GHz) (800 FSB) (D0,E0)
P4-571 (3.8GHz, 800 FSB, L2 1MB V E0)
P4-630 (3.0E GHz, 800 FSB, L2:2MB, EM64T, HT)
P4-631 (65nm,3.0GHz, 800 FSB, L2:2MB, revB1)
P4-631 (65nm,3.0GHz, 800 FSB, L2:2MB, revC1)
P4-631 (65nm,3.0GHz, 800 FSB, L2:2MB, revD0)
P4-640 (3.2E GHz, 800 FSB, L2:2MB, EM64T, HT)
P4-641 (65nm,3.2GHz, 800 FSB, L2:2MB, revB1)
P4-641 (65nm,3.2GHz, 800 FSB, L2:2MB, revC1)
P4-641 (65nm,3.2GHz, 800 FSB, L2:2MB, revD0)
P4-650 (3.4E GHz, 800 FSB, L2:2MB, EM64T, HT)
P4-651 (65nm,3.4GHz, 800 FSB, L2:2MB, revB1)
P4-651 (65nm,3.4GHz, 800 FSB, L2:2MB, revC1)
P4-651 (65nm,3.4GHz, 800 FSB, L2:2MB, revD0)
P4-660 (3.6E GHz, 800 FSB, L2:2MB, EM64T, HT)
P4-661 (65nm,3.6GHz, 800 FSB, L2:2MB, revB1)
P4-661 (65nm,3.6GHz, 800 FSB, L2:2MB, revC1)
P4-661 (65nm,3.6GHz, 800 FSB, L2:2MB, revD0)
P4-662 (3.6 GHz, 800 FSB, L2:2MB, EM64T, HT, revR0)
P4-670 (3.8 GHz, 800 FSB, L2:2MB,N0)
P4-672 (3.8 GHz, 800 FSB, L2:2MB, revR0)
Pentium D 805 (2.66 GHz, 533 FSB, revB0)
Pentium D 820 (2.8 GHz, 800 FSB, revA0)
Pentium D 820 (2.8 GHz, 800 FSB, revB0)
Pentium D 830 (3.0 GHz, 800 FSB, revA0)
Pentium D 830 (3.0 GHz, 800 FSB, revB0)
Pentium D 840 (3.2 GHz, 800 FSB, revA0)
Pentium D 840 (3.2 GHz, 800 FSB, revB0)
Pentium D 920(2.8GHz, 800 FSB, L2 4MB, revB1)
Pentium D 930(3.0GHz, 800 FSB, L2 4MB, revB1)
Pentium D 930(3.0GHz, 800 FSB, L2 4MB, revC1)
Pentium D 940(3.2GHz, 800 FSB, L2 4MB, revB1)
Pentium D 940(3.2GHz, 800 FSB, L2 4MB, revC1)
Pentium D 950(3.4GHz, 800 FSB, L2 4MB, revB1)
Pentium D 950(3.4GHz, 800 FSB, L2 4MB, revC1)
Pentium D 950(3.4GHz, 800 FSB, L2 4MB, revD0)
Pentium D 960(3.6GHz, 800 FSB, L2 4MB, revC1)
Pentium D 960(3.6GHz, 800 FSB, L2 4MB, revD0)
Pentium Extreme ED-955(3.46GHz, rev A0,B1)
Pentium Extreme ED-965(3.73GHz, rev C1)
i don't think he's asking for pentium 4 support :) – None – 2009-09-30T23:49:25.903
This is odd, but when I click the link you provided, I get: "Intel® Core™2 Duo Processor SU9400 : 1.4 GHz & Intel® Core™2 Duo Processor SU7300 : 1.3 GHz ... But when I replace the "%5F" in the URL with an underscore I get: "Intel® 1066 MHz P4 in the 775-land Package" ... Again with the confusing information... – Giffyguy – 2009-10-01T00:00:05.570
Something is wrong and I am not sure what... Manually copy and paste http://usa.asus.com/Product.aspx?P_ID=ajHa5grlVqAtbKo8 then click CPU supported - however I copied the whole list above. It does not look like it is compatible with the Core 2 line
– William Hilsum – 2009-10-01T00:07:25.337Also when I go to ASUS's CPU support page - http://support.asus.com/cpusupport/cpu_support_right.aspx - my motherboard is not even listed under the Socket775 catagory...
– Giffyguy – 2009-10-01T00:08:46.987Ah! I found what you were looking at. Wow, they should make that a bit more visable. I saw the "CPU" section on the spefifications tab and thought that was all they had. – Giffyguy – 2009-10-01T00:12:23.703