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Socket 939 Motherboards:  .... Select .... N4SLI-A9 NF4ST-A9 NF4UL-A9 Socket Types:  .... Select .... iDEQ SFF Socket 939 Socket 775 Socket 754 Socket A Socket 478 Socket 370 Model Version Chipset Socket CPU Max. Frequency N4SLI-A9 1.0 nForce 4 SLI Socket 939 Athlon 64 x2 4800+ Athlon 64 FX FX-55 Athlon 64 4000+ NF4ST-A9 1.0 nForce 4 Socket 939 Athlon 64 x2 4800+ Athlon 64 FX FX-55 Athlon 64 4000+ NF4UL-A9 1.0 nForce 4 Ultra Socket 939 Athlon 64 x2 4800+ Athlon 64 FX FX-55 Athlon 64 4000+