2 simm 72pin 4mb FP FPM Fastpage Vanguard SP26301 E VG264400BJ -7 4 MB FPM-RAM 70 ns 72-pin PS/2 Memory 8 Chips: Vanguard VG264400BJ-7 How do I know whether or not my SIMMs are parity? If the simms in your computer have chips in multiples of 3 (or 9), then those are parity simms, and you need parity simms. If the simms have chips in powers of 2 (2, 4, 8, ...) then it's non-parity.