Ram speed question

Heres the situation, my dad has a 2.4ghz northwood in some old motherboard and just got a gig of Corsier XMS 2-2-2-5 ram.
http://www.newegg.com/Product/Product.asp?Item=N82E16820145522

I benched that using Sisandra and it got like 4505. Now i go and bench my gig of OCZ EL ram and i get a 3191.
http://www.newegg.com/Product/Product.asp?Item=N82E16820146883

So then i swap ram so he has the OCZ and i have the Corsier and he scores a 4496 and i score a 3149. Why would my mother board be bottlenecking so much? I have the ASUS A7N8X-E deluxe, is this some kind of bios bug, maybe needing a new bios? What do you think?

*EDIT* I just saw another thing on the bench(i swapped the OCZ back in mine) i looked at the maximum memory bus bandwith and i scored a 6720MB/s and he scored a 6400MB/s, just something to add if it means anything.

*bump*

your scores are in line with an AthlonXP system (very good scores actually).

You can't compare memory bandwidth in dual channel mode of an AthlonXP system to a Pentium4 system. It's not a fair comparison.