Which is the better cpu buy? AMD Duron 1.6GHz $99.00 OEM with no heatsink / fan or AMD Athlon XP1900+ $115.88 retail box with heat sink fan and 3 year warantee ? Prices from pricespy nz. Both have a real clock speed of 1600 (I think) 16 x 100 and 12 x 133. What are the other specs? What cores / caches do these chips have? What real differences will it make?