PC Mark Score is the same with two different price ranged systems!!

Hey i am somewhat disappointed in somethign i ran into. I have built two computers. One for my brother and one formyself.
Asus p5q3 deluxe 215 dollars ( fsb 460 1840mhz)
ram- ddr3 1066 ocz ( running at 920mhz for 1to1 ratio)6-6-6-18
cpu- q6600 ( oc 3.7 fsb 460)
gpu- asus 4850
harddrive- sata seagate 80gb raid 0
ratio 1:1

Msi cheap 80 dollar mobo ( fsb 400 1600mhz)
ram- ddr2 1066 ocz ( running at 800mhz for 1to1 ratio) 4-4-4-12
cpu- q6600 ( oc 3.2 fsb 400)
gpu- asus 4850
harddrive- WD 500gb sata
ratio 1:1

my problem is my computer components are much better mostly speaking about motherboard, and ram and not to mention the fact mine is overclocked to 3.7 and my brothers is overclocked to 3.2. i ran PCMARK 05 and i got the same scores, it was 10997/ 10993 give or take each run. I dont see how these these two computers are running at the same speed. do you think something is bottlenecking my computer and stopping it from going faster. anyone know anythign about this?...bc the stats are clearly different, mine is much overclocked then my brothers but are having the same pcmark scores

WEll now you know.

I like your brothers better then yours, except mobo. I bet your brothers with same mobo and same OC will out perform yours.

so ddr3 is pointless for me right now?..then what purpose do we need to upgrade to ddr3?...

if worst case...should i return or sell my mobo and ram to get ddr 2 and cheaper mobo?...what mobo should i get?.i cant find any that supports crossfire at 16x...only 8x

tri channel...which wont come out until nehalem, so its more or less useless for most people right now

and its too expensive, has horrible latency and can be beaten by ddr2 at half the cost

I like the way you expounded on the reasoning.