First off- Im guessing you own a microATX motherboard? I didnt know any socket 478 motherboards even had 4x AGP (other than micro). Can you tell me what your mobo make/model is?
Second- RDRAM sucks ***. Youd be better off shoving feces into the memory slots.
You arent losing any "Ram speed", youre gaining ram efficiency. Theres a reason RDRAM didnt survive and that DDR is the industry standard.
With the correct motherboard choice and memory, you could have a nice little system there.
System specs? Lets just get down to it people:
My penis is bigger than yours.