The computer reads it as 8Gigs so I am wondering if this is ok?
Second issue is when I use CPU-Z utility, it only shows the DRAM frequency speed to be in the 668 Mhz only whereas the ram is 1600Mhz. I suppose the Dual channel is setup properly as it states Dual Channel. Have a look at the screenshot.
Should I be getting 1600Mhz or is this normal?
The Memory tab shows how much memory is installed. The SPD tab will show 4GB per module. For DDR (Double Data Rate) RAM, the frequency has to be multiplied by 2. Therefore your RAM runs at 668.6MHz x 2. You need to set the speed manually to run them at 1600MHz.
The CPU only supports 1333 memory by default. Technically, any speed over that is overclocking. You have to go into the BIOS and either enable XMP (which will set the memory to full speed automatically) or set the memory to 1600 manually.
thanks, edited in bios by enabling XMP. that was the only option available to up the speed. by the way, is this safe since you mentioned it was technically overclocking. this mobo can handle 1600 MHz and above.