Ok thanks Jokester,
Hmm when I install them the system just flat out refuses to boot and all the mobo alarms start sounding off.
Can't say I seen such a fail before except for a single 256MB stick of Corsair PC2700 I came across many years ago.
Have booted PC using my other memory, made adjustments to vDimm, Timing etc and then replaced my sticks with the ones above and no go! The systems work fine with other 1GB sticks so its not a memory size issue?
Ah well emailed seller for a refund, just really didn't look like Micron sticks to me as they normally have a micron sticker of some sort?