Greetings,
1. What is the difference between an AMD Athlon 64 x2 dual-core 3800 and an Intel Pentium 4 or D? +
Well, they are made by different companies and use different architectures among other things. There are CPU charts on Tom's Hardware where specific models are compared and I would note that while that Athlon is a specific model the others aren't as there are several Intel Pentium 4 models as well as Pentium Ds, e.g. the 800 and 900 series to give 2 subcategories here alone.
+2. We are looking to buy the Dell C521 or the E521...does anyone have experience with either of these computers or with Dell? We are looking to do some basic video and phot editing with our system so we ant it to be able to multitask. +
While I don't personally, I would note that that is likely not the top model of AMD processor that Dell offers and so one idea may be to bump this up in the case where you have something processor intensive.
Regards,
JB
Home Desktop: VoodooPC Hexx. AMD Athlon FX-60, 2 GB RAM, 2 x 250 GB HD, 7900 GTX video card.
Home Laptop: HP dv4000, Pentium M, 2 GB RAM, 80 GB HD, ATi 700 Radeon Mobility