NEC 2500A + Ritek 4X DVD-R DRD-47-4X-RDSM (Will it burn 8x?)

I just bought the NEC 2500A and a 50 pack of Ritek 4X DVD-R DRD-47-4X-RDSM off newegg. What are my chances that this media will do 8x? I have heard of people doing this. But Im not sure what media or burner will be able to do this.

THANKS!