Hey guys..
I read your topic and I've the same problem.
I'm sure that my Kingston module 1Gb is, but my PC still read 512mb. I didn't reinstalled my BIOS because it is dangerous...at least I read that.
My module is a KVR533D2N4K2/1Gb and I've a Fujitsu-Siemens PC, motherboard P5SD2-FM. I couldn 't find the BIOS in their website.
I'll appreciate your help. Thanks.