Hi!
Consider this just as a general thoughts, since I have far to little information about your needs, I just play with some ideas. Please do come back with more info about your specifik needs and perhaps even your budget and timelimit.
Calculations and databashits? Well, how about a dual opteron solution? Atleast consider it. Anyway, as far as I know (stikin out the old neck here) teh good old AMDs are better than the Intels at this department. Becasue its raw caluculation power you need, not bandwith where the Intels are superior.
Now there is Opteron mobos with AGP. Only money is an object.
"NTSI Announces Opteron with AGP graphics for CAD/CAM
Technology Solutions, Inc.(NTSI) announced a new 64 bit workstation based on the Arima HDAMB motherboard and the AMD OpteronTM processor. This is the first Opteron motherboard to support the high performance 8X AGP graphics cards needed by the engineering community. "
Anyway
GL