Viking's mission is to create products that enhance the speed, power and performance of IT systems, thereby increasing their value to the user. Viking's current offering includes over 2000 different memory, modem and flash memory products that present the fastest, most cost-effective means of expanding the capabilities of a computer or digital device.This memory is designed for the following Compaq systems:Deskpro 1000;Deskpro EC Celeron;Deskpro 2000 5166X/2100;Deskpro 2000 5166X/3200;Deskpro 2000 2000 5200X/2100;Deskpro 2000 5200X/3200;Deskpro 2000 2000 2000 6233X/2100;Deskpro 2000 2000 2000 4000 Pentium II, 440LX chipset;Deskpro 4000MMX 5166X/2400;Deskpro 4000MMX 5166X/3200;Deskpro 4000MMX 4000MMX 5200X/2400;Deskpro 4000MMX 5200X/3200;Deskpro 4000MMX 4000MMX 6233X/2400;Deskpro 4000MMX 4000MMX 4000MMX 4000MMX 4000N 5166X/1600;Deskpro 4000N 5200X/1600;Deskpro 4000N 5233X/2100;Deskpro 4000S 5166X/2100;Deskpro 4000S 5200X/2100;Deskpro 4000S 5233X/2100;Deskpro EN 6266 /3.2;Deskpro EN 6300/3.2;Deskpro EN 6300/6.4;Deskpro EN 6333/3.2;Deskpro EN 6333/4.3;Deskpro EN 6333/6.4;Deskpro EN C300/3.2;Deskpro EN C300A/3.2;Deskpro EN C333/3.2;Deskpro EN C333/6.4;Deskpro EN C400/4.3;Deskpro EN 6266/3.2 66MHz (small form factor);Deskpro EN 6333/3.2 66MHz (small form factor);Deskpro EN C300A/3.2 66MHz (small form factor);Deskpro EN C333/3.2 66MHz (small form factor);Deskpro EN C400/6.4 66MHz (small form factor);Deskpro EP 6266;Deskpro EP 6300;Deskpro EP 6333;Deskpro EP C300A (Celeron);Deskpro EP C333A (Celeron);Deskpro EP C400A (Celeron);ProSignia 310;ProSignia 320.For a complete compatibility list please refer to the original manufacturer's web site.