ComputerBB

I have a Dell 8300 from mid 2003, it came with 2 256MB PC3200 chips(400Mhz) I bought two 512Mb chips PC3200 (400Mhz) from a different company. When only one pair is in it works at full speed, but when i put both pair in it works at 333 Mhz, I know i'm putting them in the right spots because it would switch to single channel if i didn't. whats the problem?

It sounds like the computer is rejecting the hardware i would try to get another chip but from the company of your original chip

Have you tried just using the 512 chips and seeing what happens, put them in place of the two original chips.

The Two 512chips work at 400Mhz when they are the only chips.