I have a really weird issue, here are the details.
Firstly, as stated in the title i do have Vista 64 bit.
Recently bought 2x2 Gig DDR3 1600 (corsair TW3X4G1600C9DH) with timings 9-9-9-24. My motherboard is an Asus P5Q3 Deluxe.
This chipset (Intel P45) has know issues with DDR3 running at higher than 1066, but this has supposedly been rectified with a BIOS update which i have flashed, so not sure if that is relevant as my problem is not speed related.
Under system properties the ram is shown as 4 Gigs but in task manager it says: Physical Memory, Total: 2046. The usage graph shows about 1.1 used and is just over half-way full.
Not sure if this is valid but i have a pre-release SP2, not sure if this could cause such a problem.
CPU-z shows both modules are there, but shows total 4 gigs, however Everest only shows 2 Gigs.
Screenshot below, hope this is not too big, but theres a lot of info to squeeze in.
Any help will be most appreciated.