A 4GB kit of Dominator GT DDR2.  Yes, it exists!  This was the top stuff from the very end of the DDR2 cycle, but I've never seen it for sale in the UK - I got this imported from a friend on the continent.

Tested for OC and got DDR2-1150 without touching timings/voltage, it's possible this was board/cpu limited, conversely your mileage may vary as different overall setups have different OC capability.

No original packaging, but will be very well packaged - I know how irreplaceable a kit like this is!