The R8 only supports up to DDR 3200 as per the manual, page 13
The 3,600 Mhz ram will not have an XMP profile that is compatible with the R8 and will either not work, or need memory settings entered manually based on the XPM settings for timings and voltage.
Also, I am not sure if you did, but you cannot mix and max different memory modules.
And thirdly these systems are often very picky when it comes to aftermarket memory support.
As with the old memory, see if a CMOS reset while using the old memory configuration brings it back alive.
Yes, that is indeed correct. They are rather picky. I have not seen an R8 ram thread, but there is an R10 ram thread.
It might provide you some ideas of kits that might work also for your R8, although there's no guarantee.
Only the R8 validated memory is guaranteed.
I would double check to ensure the memory module is seated properly.
If that does not make a difference, try removing the CMOS battery, short the CMOC clear pins, and insert the CMOS battery again. Sometimes that helps with a full reset of the bios settings.
Alternatively you could try a single stick of the original memory in slot 2.
But no error codes on the Alienware head?
