The New AMD 64 Bit chips have many advantages. All support the SSE and SSE2 extended instructions.SSE is "Streaming SIMD Extentions". The 4GB Memory space limit on 32 Bit processors goes away. The Hammer core support a 1TB TeraByte physical memory limit and a 256TB virtual-address space!
| 1 Way | 2 Way | 8 Way | |
| 1.4 GHz | Opteron 140 | Opteron 240 | Opteron 840 |
| 1.6 GHz | Opteron 142 | Opteron 242 | Opteron 842 |
| 1.8 GHz | Opteron 144 | Opteron 244 | Opteron 844 |
| 2.0 GHz | Opteron 146 | Opteron 246 | Opteron 846 |
See Understanding AMD Opteron™ Processor Model Numbers for information on the different Opteron model numbers.
Opteron 246
2GHz 940 Pins, 130nm SOI, 105.9 Million Transistors, Size 193mm2, 128KB L1, 1MB L2.
Athlon 64 FX-51
940-pin, dual-channel DDR400 Memory runs a 2.2GHz
Requires reistered DDR400 DIMMs.
Everything I have read indicates the FX is an Opteron, it works in Opteron motherboards with a BIOS update.
Athlon 64 3200
754-pin, Single channel DDR333 Memory
NetBSD now supports AMD64 Architecure