UKTopGun said:600W
Seasonic S12 600W - £100
Tagan TG600 600W - £90
FSP Epsilon 600W - £90
Enermax Liberty 620W - £100
OCZ GameXStream 600W - £80
500W
Seasonic S12 500W - £75
Tagan Tg500 500W - £75
Enermax Liberty 500W - £70
All good PSU's.
But I dont recommend going as low as 430W as I suspect that X1950XTX is going to be pretty power hungry. Plus your most likely going to get your E6700 to 4GHz also and thats just on stock volts on 800Mhz ram.
