Just as you'd expect, the Pentium D 805 is a very good value if you are either: 1) multitasking, or 2) running multithreaded applications. As we've seen by its performance in Internet Content Creation SYSMark, 3dsmax and our suite of media encoding applications, if you're running the right apps and workloads then the Pentium D 805 offers an unstoppable value. The chip ends up delivering much better overall performance at the price of a single core CPU.
The 805 also does a good job of staying competitive with the Pentium D 820 and 920. In most cases, the 805 offers within 5% of the performance of the Pentium D 820 despite its lower clock speed and 533MHz FSB. For the budget conscious, or if you're planning another more serious upgrade later this year to Socket-AM2 or Conroe, a Pentium D 805 coupled with a cheap 945 motherboard can't be beat.
The fact of the matter is that Socket-AM2 is just around the corner, and Conroe appears to be the Intel chip to wait for, so if you're upgrading or buying today we'd strongly recommend going with a more economical system upgrade. At $133, the Pentium D 805 is a very good balance between price and performance, provided that your workload is multithreaded or multitasking in nature.