"First of all, from a budget standpoint, the 3800+ bests a very game Pentium D 820 in almost every benchmark. Looking at this from one point of view, the Pentium D 820 is a little over $118 cheaper at $236 as compared to the 3800+ X2's $354 price tag. But, and this is a big BUT, the Pentium D 820 requires a new motherboard, either an Intel based 945 or 955 chipset board, while on the other hand, the AMD Athlon 64 X2 3800+ will work with nearly every 939 motherboard on the market with a simple BIOS upgrade... that quickly erases that $118 price difference."