8GB DIMM RAM can't be recognized

Solution
That 8 GB module uses memory chips that use 4 bit memory data width which is not compatible with the Intel system (Intel system recognizes 8 and 16 bit memory chip data width only) ASRock H61M-VS3 motherboard. That 8 GB module is intended for AMD systems where the 4 bit memory data width is recognized and compatible.

Also, a balanced dual channel setup is recommended to maximize memory bandwidth; that is two modules of the same capacity and from the same dual channel kit be used. Something like a 2 x 4 GB dual channel kit would be suggested to replace the existing 2 GB module. Using a 2 GB module in one channel and an 8 GB module in the other channel makes an unbalanced arrangement where memory bandwidth is substantially lower...
That 8 GB module uses memory chips that use 4 bit memory data width which is not compatible with the Intel system (Intel system recognizes 8 and 16 bit memory chip data width only) ASRock H61M-VS3 motherboard. That 8 GB module is intended for AMD systems where the 4 bit memory data width is recognized and compatible.

Also, a balanced dual channel setup is recommended to maximize memory bandwidth; that is two modules of the same capacity and from the same dual channel kit be used. Something like a 2 x 4 GB dual channel kit would be suggested to replace the existing 2 GB module. Using a 2 GB module in one channel and an 8 GB module in the other channel makes an unbalanced arrangement where memory bandwidth is substantially lower than that from balanced configuration.
 
Solution