Match your ram.............. Ultra, Kingston, OCZ, Corsair, etc. use different manufacturerâ€™s memory chips. Different speeds, timings, etc. Even if they used the same memory chips their board designs are unique them. System reliability will be questionable whether youâ€™re running single or dual channel with miss-matched memory, even if you get the machine to post.
Test your configuration with memtest or prime95â€¦â€¦â€¦