Philips 1610A burning problems,lil help plz

My 1610A Philips burner is burning at half speed with cdr!!!
It is only burning at 16x with old 16x recordables, which aren’t available any more!!!
ALL RECORDABLES ACCEPT DESE WORK ONLY WITH 8x (so the 32x, 40x 48x, 24x) even of brand philips

My firmware = 1.5
Mobo = MSI k7tpro2a with bios 2.6 (latest, updated today)
Pro= athlon 1200@1000 (thus from 1000 to 1200)
Mem= 256mb (2x128) Sdr

It is on secundairy Master