Re: Dimension 8400 RAM
The memory HERE is certified to be compatible with your D-8400 system and has a lifetime warranty and free S&H on orders $40.00+.
You can upgrade to any Socket LGA775, 5xx, 6x0 or 6x2 processor, with 90nm architecture, but not the 6x1 processors.
8400 systems do not support dual core [Pentium D] or Core 2 Duo processors.
The 670 3.8Ghz is the largest.